{"id":6901,"date":"2026-05-09T15:54:10","date_gmt":"2026-05-09T07:54:10","guid":{"rendered":"https:\/\/www.cjmsteelgroup.com\/?p=6901"},"modified":"2026-05-09T15:55:54","modified_gmt":"2026-05-09T07:55:54","slug":"astm-a709-steel-plate-grades-bridge-weathering-application","status":"publish","type":"post","link":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html","title":{"rendered":"ASTM A709 Steel Grade Selection Guide: 50, 50W Weathering Steel &amp; HPS 70W for Bridge Projects"},"content":{"rendered":"<blockquote class=\"wp-block-quote has-pale-cyan-blue-background-color has-background\">\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-235e05db4591425d369b3480437bc90f\"><strong>\ud83d\udd39 Quick Grade Selection \u2014 ASTM A709<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-b23505fb76b1aed0722c5633e8f2363c\">\u2192 Standard bridge, cost-sensitive project \u2192 <strong>Grado 50<\/strong><br>\u2192 Exposed structure, unpainted finish \u2192 <strong>Grade 50W (weathering steel)<\/strong><br>\u2192 Long-span bridge or cold climate project \u2192 <strong>HPS 70W<\/strong><br>\u2192 Need rounds or angles for exposed members \u2192 <strong>Grade 50W rounds \/ corten angles<\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-4a8e51fee1488ad4857a0802d5526bbf\">All grades available export-ready from China with Mill Test Report (MTR) and SGS inspection.<\/p>\n<\/blockquote>\n\n\n\n<p> <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"562\" src=\"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/bridge-steel-plates-applications.jpg\" alt=\"ASTM A709 steel plate used in modern highway bridge construction\" class=\"wp-image-7663\" style=\"width:500px\" srcset=\"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/bridge-steel-plates-applications.jpg 700w, https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/bridge-steel-plates-applications-300x241.jpg 300w, https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/bridge-steel-plates-applications-15x12.jpg 15w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><br>Placa de acero ASTM A709 utilizada en la construcci\u00f3n moderna de puentes de carretera<\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-2ec40f15f9c08a36d3298e137125a52f\"><strong>What Is ASTM A709 and Who Needs It<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-432e33d15c5344db6dd77393e85350b7\">ASTM A709 is the structural steel specification for bridge construction in the United States, covering a range of carbon and high-strength low-alloy (HSLA) steels for critical load-bearing members.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-1466333e30f229382e8fb1c7002c67ab\">If your project involves highway bridges, pedestrian crossings, railway overpasses, or similar infrastructure, your engineer or client specification is likely referencing one of three grades: <strong>Grade 50, Grade 50W, or HPS 70W<\/strong>.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-4d2df0f5a614ef9929db677b350651ca\">Each grade serves a different structural and environmental purpose. This guide helps procurement managers and project teams understand the differences and make the right material decision before sourcing.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-88316224bcdfeb33047a469dfad7ef16\"><strong>Key performance requirements addressed by ASTM A709 include:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-0be47a6273f91186eaafc835209c2b00\">Structural strength for bridge loading conditions<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-1b8a6009bf6b924eab4a40e6abc2c244\">Notch toughness for fracture-critical members<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-637b0fc07ff43a751d3e1907ddb62470\">Atmospheric corrosion resistance for exposed structures<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-a3ffd95a09f449bbf94758236784a476\">Weldability and fabrication performance<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-5ff43f321f20e8bf89dba7724e92352e\"><strong>Grade overview:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-fb3655aa3e5ab80eb7b57317fee83428\"><strong>ASTM A709 Grado 50<\/strong> \u2014 Balanced strength and cost, commonly used in general bridge structures<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-3c7ee3d67049594e32028a9d03cc0eab\"><strong>ASTM A709 Grado 50W<\/strong> \u2014 Enhanced atmospheric corrosion resistance for exposed bridge components<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-fa1beeff20f570037b37035c1c5427c8\"><strong>ASTM A709 HPS 70W<\/strong> \u2014 Higher strength and improved toughness for long-span and high-performance bridges<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-22001f574af53fb11fc3c7db557bff6f\"><strong>ASTM A709 Grade Comparison: Which One Fits Your Project?<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-a1c9bb33d4cd87788f76bcd603e7590e\">Before reviewing each grade in detail, the table below provides a side-by-side comparison to help narrow down your selection based on project requirements.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Factor<\/th><th>Grado 50<\/th><th>Grado 50W<\/th><th>HPS 70W<\/th><\/tr><\/thead><tbody><tr><td><strong>L\u00edmite el\u00e1stico<\/strong><\/td><td>345 MPa (50 ksi)<\/td><td>345 MPa (50 ksi)<\/td><td>485 MPa (70 ksi)<\/td><\/tr><tr><td><strong>Resistencia a la tracci\u00f3n<\/strong><\/td><td>450-620 MPa<\/td><td>485-620 MPa<\/td><td>585\u2013760 MPa<\/td><\/tr><tr><td><strong>Resistencia a la corrosi\u00f3n<\/strong><\/td><td>Est\u00e1ndar<\/td><td>Self-patina (no paint)<\/td><td>Self-patina (no paint)<\/td><\/tr><tr><td><strong>CVN Toughness<\/strong><\/td><td>Required<\/td><td>Required<\/td><td>Required<\/td><\/tr><tr><td><strong>Paint Required<\/strong><\/td><td>S\u00ed<\/td><td>No (if exposed)<\/td><td>No (if exposed)<\/td><\/tr><tr><td><strong>Coste relativo<\/strong><\/td><td>$<\/td><td>$$<\/td><td>$$$<\/td><\/tr><tr><td><strong>Available Forms<\/strong><\/td><td>Plate, heavy plate<\/td><td>Plate, rounds, angles<\/td><td>Plate, heavy plate<\/td><\/tr><tr><td><strong>Lo mejor para<\/strong><\/td><td>General bridges<\/td><td>Exposed structures<\/td><td>Long spans, cold climates<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-a726ce37372a128a4a92ec74a8c3bea2\"><strong>ASTM A709 Grado 50<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-0539ed6187432ca02ad6bbcc76352497\"><strong>Minimum yield strength:<\/strong> 345 MPa (50 ksi)<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-fc92d5da7b01ef6a3fa2dd2501276e56\"><strong>Tensile strength:<\/strong> 450\u2013620 MPa (65\u201390 ksi)<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-6c9f4cc714d64815c4e8113f0156d512\"><strong>Aplicaciones:<\/strong> General bridge components, including girders and supports<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-b0ed219293ad26ea20407b84e77a2fd1\"><strong>Key advantage:<\/strong> Cost-effective balance of strength and weldability<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-9ca47fd752a3ef5e0e1dcbb849f87717\">Grade 50 is the standard choice for conventional bridge construction where atmospheric corrosion resistance is not a primary requirement and protective coating systems will be applied.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-6026eebdeeb9e30cb1ea628efbf06285\"><strong>ASTM A709 Grade 50W \u2014 Weathering Steel<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"338\" src=\"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE.jpg\" alt=\"Stacked astm a709-50w corten weathering steel showing rust-resistant surface\" class=\"wp-image-7664\" style=\"width:500px;height:auto\" srcset=\"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE.jpg 600w, https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE-300x169.jpg 300w, https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption class=\"wp-element-caption\">Stacked astm a709-50w corten weathering steel<\/figcaption><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-0539ed6187432ca02ad6bbcc76352497\"><strong>Minimum yield strength:<\/strong> 345 MPa (50 ksi)<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-3a6ce208d735eef4f1a1905ceb50281b\"><strong>Key feature:<\/strong> Resistencia a la corrosi\u00f3n atmosf\u00e9rica<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-e374ef7e3a7ae1f6272ac747989a0670\"><strong>Alloying elements:<\/strong> Copper, chromium, and nickel<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-88cfa6245ee08a1b6ff69aaaa3d75e30\"><strong>Common uses:<\/strong> Exposed bridge structures where paint systems are not desirable<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-07eeed28786f44d5089ec752dbc941a5\">Grade 50W forms a stable protective oxide layer (patina) when exposed to suitable environments, reducing the need for painting and long-term maintenance. It is commonly specified for exposed bridge structures where lifecycle cost control is a priority.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-fc78349f25e685a05f077bc12cd99bce\"><strong>ASTM A709 HPS 70W \u2014 High Performance Steel<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-d0b0d3913ae4efe728a9b49558e1b1ac\"><strong>Minimum yield strength:<\/strong> 485 MPa (70 ksi)<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-304493472c1a61222e1cbbf140f42236\"><strong>Tensile strength:<\/strong> 585\u2013760 MPa<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-f8837ff59615cb930ebe9f3d1ebecf2b\"><strong>Designed for:<\/strong> Enhanced toughness and improved weldability<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-1687b894e4200f15dc61a2f4bd6ac720\"><strong>Typical applications:<\/strong> Long-span bridges and fracture-critical members<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-1dd9f5ee6b3e82229b6157ae26ea3faf\">HPS 70W enables lighter structural designs while maintaining excellent fracture resistance, even in colder climates. It is typically specified when Grade 50W does not provide sufficient strength for the structural demand.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-cdebed37e1db440c1aa810ee05df72bb\"><strong>Product Forms: As-Rolled Plate, Heavy Plate, Rounds &amp; Angles<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-b028828022d126f8c07ab1be5a042c85\">ASTM A709 steel is available in several product forms depending on structural function and fabrication method:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-ce931c3123e83a50c7e0a4e1cf9507e2\">As-rolled ASTM A709 plates are often specified where post-heat treatment is not required and where cost efficiency is important. Typical applications include bridge girder webs and flange plates.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-c8ccf42e382d2dd8358ed1ed95d30b14\">Heavy plate sections are used for primary load-bearing members such as girders and stiffeners, where thickness and through-thickness properties are critical.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-90ed5a06427697398454d92432a99d16\">Grade 50W weathering steel is also available in <a href=\"https:\/\/www.cjmsteelgroup.com\/es\/carbon-steel\/carbon-steel-bar\/\" target=\"_blank\" rel=\"noopener\" title=\"rondas\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">rondas<\/mark><\/strong><\/a> and corten <strong><a href=\"https:\/\/www.cjmsteelgroup.com\/es\/carbon-steel-angle.html\/\" target=\"_blank\" rel=\"noopener\" title=\"\u00e1ngulos\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\u00e1ngulos<\/mark><\/a><\/strong> for exposed structural components, where both corrosion resistance and structural performance are required. These forms are commonly used in pedestrian bridge railings, exposed cross-frames, and decorative structural elements.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-a1fb50b6c91e6b1bfd6b82718e9d3d1b\">These forms reflect design and fabrication choices, not performance differences within the ASTM A709 specification itself. The grade selected determines corrosion resistance and strength; the product form is determined by the structural detail and fabrication requirement.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-8fd30242580caee41c5e6045f36eab50\"><em>For detailed dimensions, thickness ranges, and available grades used in bridge fabrication, you can refer to our <strong><a href=\"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-bridge-steel-plate.html\/\" target=\"_blank\" rel=\"noopener\" title=\"ASTM A709 bridge steel plate\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Placa de acero ASTM A709<\/mark><\/a><\/strong> product page.<\/em><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-d77fbb52bc5e6aa8c5d8b119e8993cd5\"><strong>When to Specify Grade 50W: Weathering Steel for Exposed Structures<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-3af6e8765d552a16cd7b99948b62b60c\">ASTM A709 Grade 50W weathering steel is particularly suitable for unpainted, exposed bridge structures. Its protective patina develops naturally over time, minimizing further corrosion under appropriate environmental conditions.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-e20f04aada62277b51c98d2559cbf521\"><strong>Grade 50W is often specified for:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-680c928665699b7c56a741ff30556b02\">Pedestrian and vehicular bridges in rural or low-pollution environments<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-cc92c170b61befa7a93f2f3ef2677809\">Mountainous or inland crossings with limited maintenance access<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-e0d67dcf98f0c1e2ba803928ff412036\">Bridge components where paint application and recoating are not practical<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-0c6698102dc418ee5895586e32ea9019\">Architectural bridge designs where a natural weathered appearance is preferred<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-963da6e57fe7e931b2de4a5c6c196080\"><strong>Important:<\/strong> Grade 50W performs best in environments with alternating wet and dry cycles. It is not recommended for constant water contact, buried conditions, or highly industrial or marine environments.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-59c063386d850f754c9413657d948096\"><strong>Grade 50W vs HPS 70W: Mechanical Performance Compared<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Grado<\/th><th>L\u00edmite el\u00e1stico (MPa)<\/th><th>Resistencia a la tracci\u00f3n (MPa)<\/th><th>Alargamiento (%)<\/th><th>Resistencia Charpy V-Notch<\/th><\/tr><\/thead><tbody><tr><td>50W<\/td><td>345<\/td><td>485-620<\/td><td>\u2265 18<\/td><td>Bueno a temperatura ambiente<\/td><\/tr><tr><td>HPS 70W<\/td><td>485<\/td><td>585-760<\/td><td>\u2265 19<\/td><td>Excelente a bajas temperaturas<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-321d8be98ed847f9d02cb738d18b91d6\"><strong>From a selection perspective:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-407db3b0c0f50b6c32191bc1f17aa385\">HPS 70W prioritizes strength and toughness for long-span applications<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-fa74f203058a6c82502e6bd795566320\">Grade 50W emphasizes corrosion resistance and reduced maintenance cost<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-f29e19db17a9a5993effdc77908900d8\"><strong>Environmental Considerations by Region<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-7b27d1da3531f1bf41d5634360c2a921\"><strong>Middle East \/ Hot-dry climate:<\/strong><br>Grade 50W performs well inland. Coastal projects should use coated Grade 50.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-5ef37db3f2333acdaef9e367402313f5\"><strong>Southeast Asia \/ Coastal-humid:<\/strong><br>High humidity may prevent stable patina. Prefer coated Grade 50 near marine areas.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-ee2cf6aeb8eeb042370a496a1309ef96\"><strong>Russia \/ Extreme cold:<\/strong><br>HPS 70W preferred for low-temperature toughness.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-0a169dad86ee7ee7218201c552529802\"><strong>Europe \/ Temperate:<\/strong><br>Both 50W and HPS 70W are commonly used depending on structure.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-b9dc5a899d041b011a5ba648ca8456da\"><strong>ASTM A709 vs ASTM A588: Choosing the Right Weathering Steel Standard<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Caracter\u00edstica<\/th><th>A709 Grado 50W<\/th><th>ASTM A588<\/th><\/tr><\/thead><tbody><tr><td><strong>Dise\u00f1ado para<\/strong><\/td><td>Construcci\u00f3n de puentes<\/td><td>General structures<\/td><\/tr><tr><td><strong>CVN toughness<\/strong><\/td><td>Mandatory<\/td><td>Not required<\/td><\/tr><tr><td><strong>Fracture-critical use<\/strong><\/td><td>Covered<\/td><td>Not specified<\/td><\/tr><tr><td><strong>L\u00edmite el\u00e1stico<\/strong><\/td><td>345 MPa<\/td><td>345 MPa<\/td><\/tr><tr><td><strong>Resistencia a la corrosi\u00f3n<\/strong><\/td><td>Similar<\/td><td>Similar<\/td><\/tr><tr><td><strong>Bridge use<\/strong><\/td><td>Correct spec<\/td><td>Not recommended<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-5d203c7dc88845b1b384a1baf0df297f\">For any fracture-critical bridge member, always specify ASTM A709 \u2014 not A588.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-b30eee669175f8ff4c51a4998946f21b\"><strong>Practical Grade Selection: A Decision Framework for Procurement Teams<\/strong><\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-c380875c904a4ed868e252ea334623b7\"><strong>Use Grade 50 when:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-3f9baf7658ca366ce05af04830419a25\">Steel will be painted<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-513f808f37c4444b8d13b07d83880fc2\">Cost-sensitive projects<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-820ee188a0d001b096bc9b04a4fcb102\">Standard bridge components<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-bd82ddb4a4f1062804313266e6294849\"><strong>Use Grade 50W when:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-b1eaec9b9a5d30a7128f68f84ef7d908\">Exposed, unpainted structures<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-13dffb304cdd330ed1d15a42fcd284c3\">Inland \/ temperate environments<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-141b3419d6589d0e1ac52179a7165a68\">Lifecycle cost reduction is needed<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-614ce85dc8d41c0cc6caa55b6f4aa956\"><strong>Use HPS 70W when:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-6627ba4dbbc2a43e8907b03cf2ab8376\">Long-span bridges<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-e9d61ba2ee6c87598e3c88005b4495c2\">Cold climates<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-f35b6a52828243c9d6acb761d0295ac7\">High strength and toughness required<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-255bfe8b3c8ffe6a7f34442ae61f6b71\"><strong>Sourcing ASTM A709 Steel Plate from China: What to Expect<\/strong><\/h3>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-6bda144dbb1655c465336104d4cf2d5a\">Certificaciones:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-3f8cea882766f86b26d71baff883bb7b\">Mill Test Report (MTR)<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-9f1ac7e6b3d3880ecbb9e0111f7e1493\">SGS inspection<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-e8d95021f4eff588a6e61c37c95f930c\">EN 10204 3.1 \/ 3.2<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-882c3a15172b225f781af160e1ecbe5a\">Available forms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-571b6addc92111e46f5bf71d65dabd1a\">Heavy plate: 8\u2013150mm<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-ef9175a94a897eb3a5af54254ac29d6d\">As-rolled plate<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-1d55a06ef94bc5130c36d09b5df6744f\">50W plates \/ rounds \/ corten angles<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-6c3e5214c0c55bc36626ead64bdb2551\">HPS 70W (indent basis)<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-637a7f85621ca929498f4f4befec7c7f\">Lead time:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-40128193bc69ac6b3fd41362479da4b3\">50 \/ 50W: 15\u201325 days<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-d29971f16be02a3ac661dfeceb02194e\">50W sections: 20\u201330 days<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-e64b21dbce85307c8e3ed3c53ad0dfbb\">HPS 70W: 25\u201340 days<\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-81fe81fb2ebbc88c84176d23bc9f3dde\">Export ports: Tianjin, Qingdao, Shanghai<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-56f2d752566badeca1732dd1583ebfb8\"><em><strong><a href=\"https:\/\/www.cjmsteelgroup.com\/es\/contact-us.html\/\" target=\"_blank\" rel=\"noopener\" title=\"P\u00f3ngase en contacto con nosotros\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Contact CJM Steel<\/mark><\/a> for specifications, availability, and pricing<\/strong><\/em><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-383c3a5feaf9628dc0d2fcb2e37c0973\"><strong>Preguntas frecuentes<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color wp-elements-d9ed4f5b9eb3da5aec4a69b22d88c347\"><strong>Q: Difference between Grade 50 and 50W?<\/strong><br>A: Same strength. 50W has corrosion resistance and can be used unpainted.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-14b3d2bee9988557ca349e6161682be2\"><strong>Q: When to use HPS 70W?<\/strong><br>A: For higher strength, long spans, and cold environments.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-f0575643c28385b7b01c6ce49fafb79c\"><strong>Q: A709 vs A588?<\/strong><br>A: A709 is required for bridge applications due to toughness requirements.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-f57cadfe047f27ced08f61ff4a1ed05e\"><strong>Q: Chinese equivalent of 50W?<\/strong><br>A: Q355NH (GB\/T 4171).<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-5c5131e206dc50ec89cc473ee7738403\"><strong>Q: Are 50W rounds and angles available?<\/strong><br>A: Yes, available for export with standard packaging.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color wp-elements-59728b5870554910930ce6ae1077d952\"><strong>Q: Can 50W be used in marine environments?<\/strong><br>A: Not recommended; use coated Grade 50 instead.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd39 Quick Grade Selection \u2014 ASTM A709 \u2192 Standard bridge, cost-sensitive project \u2192 Grade 50\u2192 Exposed structure, unpainted finish \u2192 Grade 50W (weathering steel)\u2192 Long-span bridge or cold climate project \u2192 HPS 70W\u2192 Need rounds or angles for exposed members \u2192 Grade 50W rounds \/ corten angles All grades available export-ready from China with Mill [&hellip;]<\/p>","protected":false},"author":1,"featured_media":7664,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-6901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"metadata":{"_edit_lock":["1778314355:1"],"_thumbnail_id":["7664"],"_edit_last":["1"],"_aioseo_title":["ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose"],"_aioseo_description":["Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers."],"_aioseo_keywords":[""],"_aioseo_og_title":[null],"_aioseo_og_description":[null],"_aioseo_og_article_section":[""],"_aioseo_og_article_tags":[""],"_aioseo_twitter_title":[null],"_aioseo_twitter_description":[null],"themepark_seo_title":["ASTM A709 Steel Plate Choosing Guide: Grade 50, 50W, HPS 70W"],"themepark_seo_description":["Compare ASTM A709 steel plate grades 50, 50W, and HPS 70W for bridge construction. Learn strength, weathering performance, and typical applications."],"catce":["sidebar-widgets4"],"views":["4501"],"themepark_seo_keyword":["as rolled astm a709, astm a709 steel plate, a709 heavy steel plate, a709-50w weathering steel rounds"],"_wp_old_date":["2026-01-02"]},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.6.0 - aioseo.com -->\n\t\t<meta name=\"description\" content=\"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.\" \/>\n\t\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t\t<link rel=\"canonical\" href=\"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO Pro (AIOSEO) 4.6.0\" \/>\n\t\t<meta property=\"og:locale\" content=\"es_ES\" \/>\n\t\t<meta property=\"og:site_name\" content=\"CJM Steel Group Ltd. -\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose\" \/>\n\t\t<meta property=\"og:description\" content=\"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-05-09T07:54:10+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-05-09T07:55:54+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BlogPosting\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#aioseo-article-mi2u6pjv\",\"name\":\"ASTM A709 Steel Grade Selection Guide: 50, 50W Weathering Steel &amp; HPS 70W for Bridge Projects\",\"headline\":\"ASTM A709 50 \\\/ 50W \\\/ HPS 70W Bridge Steel | How To Choose\",\"description\":\"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.\",\"author\":{\"@type\":\"Person\",\"name\":\"CJMSTEEL\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/author\\\/cjmsteel\\\/\"},\"publisher\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#organization\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/A709-STEEL-PLATE.jpg\",\"width\":600,\"height\":338},\"datePublished\":\"2025-07-14T00:00:00+08:00\",\"dateModified\":\"2026-05-09T00:00:00+08:00\",\"inLanguage\":\"es-ES\",\"keywords\":\"ASTM A709 Grade 50,  ASTM A709 Grade 50W,  ASTM A709 HPS 70W\",\"articleSection\":\"News\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#listItem\",\"position\":1,\"name\":\"Home\"}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#organization\",\"name\":\"C.J.M.Stainless Steel Group Ltd\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/author\\\/cjmsteel\\\/#author\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/author\\\/cjmsteel\\\/\",\"name\":\"CJMSTEEL\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#authorImage\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e621faa14ee404cf0eafa0e6dd350088?s=96&d=mm&r=g\",\"width\":96,\"height\":96,\"caption\":\"CJMSTEEL\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#webpage\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html\",\"name\":\"ASTM A709 50 \\\/ 50W \\\/ HPS 70W Bridge Steel | How To Choose\",\"description\":\"Learn how to choose ASTM A709 Grade 50, 50W weathering steel & HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.\",\"inLanguage\":\"es-ES\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#breadcrumblist\"},\"author\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/author\\\/cjmsteel\\\/#author\"},\"creator\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/author\\\/cjmsteel\\\/#author\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/A709-STEEL-PLATE.jpg\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html\\\/#mainImage\",\"width\":600,\"height\":338},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/astm-a709-steel-plate-grades-bridge-weathering-application.html#mainImage\"},\"datePublished\":\"2026-05-09T15:54:10+08:00\",\"dateModified\":\"2026-05-09T15:55:54+08:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#website\",\"url\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/\",\"name\":\"C.J.M.Stainless Steel Group Ltd\",\"inLanguage\":\"es-ES\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.cjmsteelgroup.com\\\/es\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO Pro -->\r\n\t\t<title>ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose<\/title>\n\n","aioseo_head_json":{"title":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel & HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","canonical_url":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"og:locale":"es_ES","og:site_name":"CJM Steel Group Ltd. -","og:type":"article","og:title":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","og:description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","og:url":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html","article:published_time":"2026-05-09T07:54:10+00:00","article:modified_time":"2026-05-09T07:55:54+00:00","twitter:card":"summary_large_image","twitter:title":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","twitter:description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BlogPosting","@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#aioseo-article-mi2u6pjv","name":"ASTM A709 Steel Grade Selection Guide: 50, 50W Weathering Steel &amp; HPS 70W for Bridge Projects","headline":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","author":{"@type":"Person","name":"CJMSTEEL","url":"https:\/\/www.cjmsteelgroup.com\/es\/author\/cjmsteel\/"},"publisher":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/#organization"},"image":{"@type":"ImageObject","url":"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE.jpg","width":600,"height":338},"datePublished":"2025-07-14T00:00:00+08:00","dateModified":"2026-05-09T00:00:00+08:00","inLanguage":"es-ES","keywords":"ASTM A709 Grade 50,  ASTM A709 Grade 50W,  ASTM A709 HPS 70W","articleSection":"News"},{"@type":"BreadcrumbList","@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/www.cjmsteelgroup.com\/es\/#listItem","position":1,"name":"Home"}]},{"@type":"Organization","@id":"https:\/\/www.cjmsteelgroup.com\/es\/#organization","name":"C.J.M.Stainless Steel Group Ltd","url":"https:\/\/www.cjmsteelgroup.com\/es\/"},{"@type":"Person","@id":"https:\/\/www.cjmsteelgroup.com\/es\/author\/cjmsteel\/#author","url":"https:\/\/www.cjmsteelgroup.com\/es\/author\/cjmsteel\/","name":"CJMSTEEL","image":{"@type":"ImageObject","@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#authorImage","url":"https:\/\/secure.gravatar.com\/avatar\/e621faa14ee404cf0eafa0e6dd350088?s=96&d=mm&r=g","width":96,"height":96,"caption":"CJMSTEEL"}},{"@type":"WebPage","@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#webpage","url":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html","name":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel & HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","inLanguage":"es-ES","isPartOf":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/#website"},"breadcrumb":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#breadcrumblist"},"author":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/author\/cjmsteel\/#author"},"creator":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/author\/cjmsteel\/#author"},"image":{"@type":"ImageObject","url":"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE.jpg","@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html\/#mainImage","width":600,"height":338},"primaryImageOfPage":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html#mainImage"},"datePublished":"2026-05-09T15:54:10+08:00","dateModified":"2026-05-09T15:55:54+08:00"},{"@type":"WebSite","@id":"https:\/\/www.cjmsteelgroup.com\/es\/#website","url":"https:\/\/www.cjmsteelgroup.com\/es\/","name":"C.J.M.Stainless Steel Group Ltd","inLanguage":"es-ES","publisher":{"@id":"https:\/\/www.cjmsteelgroup.com\/es\/#organization"}}]}},"aioseo_meta_data":{"post_id":"6901","title":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","keywords":"[]","keyphrases":"{\"focus\":{\"keyphrase\":null,\"score\":82,\"analysis\":{\"keyphraseInTitle\":{\"score\":9,\"maxScore\":9,\"error\":0},\"keyphraseInDescription\":{\"score\":9,\"maxScore\":9,\"error\":0},\"keyphraseLength\":{\"score\":9,\"maxScore\":9,\"error\":0,\"length\":2},\"keyphraseInURL\":{\"score\":5,\"maxScore\":5,\"error\":0},\"keyphraseInIntroduction\":{\"score\":3,\"maxScore\":9,\"error\":1},\"keyphraseInSubHeadings\":{\"score\":3,\"maxScore\":9,\"error\":1},\"keyphraseInImageAlt\":{\"score\":9,\"maxScore\":9,\"error\":0},\"keywordDensity\":{\"type\":\"best\",\"score\":9,\"maxScore\":9,\"error\":0}}},\"additional\":[]}","primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":"","og_custom_url":null,"og_article_section":null,"og_article_tags":"[]","twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":{"id":"#aioseo-article-mi2u6pjv","slug":"article","graphName":"Article","label":"Article","properties":{"type":"BlogPosting","name":"#post_title","headline":"ASTM A709 50 \/ 50W \/ HPS 70W Bridge Steel | How To Choose","description":"Learn how to choose ASTM A709 Grade 50, 50W weathering steel &amp; HPS 70W for bridge projects. Comparison, applications, and key selection tips for buyers.","image":"","keywords":"[{\"label\":\"ASTM A709 Grade 50\",\"value\":\"ASTM A709 Grade 50\"},{\"label\":\" ASTM A709 Grade 50W\",\"value\":\" ASTM A709 Grade 50W\"},{\"label\":\" ASTM A709 HPS 70W\",\"value\":\" ASTM A709 HPS 70W\"}]","author":{"name":"#author_name","url":"#author_url"},"dates":{"include":true,"datePublished":"07\/14\/2025","dateModified":"05\/09\/2026"}}},"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"BlogPosting","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":"-1","robots_max_videopreview":"-1","robots_max_imagepreview":"large","priority":null,"frequency":"default","local_seo":null,"limit_modified_date":false,"created":"2025-07-14 06:38:18","updated":"2026-05-09 08:02:07"},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/www.cjmsteelgroup.com\/es\" title=\"Home\">Home<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/www.cjmsteelgroup.com\/es\/news\/\" title=\"News\">News<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\tASTM A709 Steel Grade Selection Guide: 50, 50W Weathering Steel &amp; HPS 70W for Bridge Projects\n<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/www.cjmsteelgroup.com\/es"},{"label":"News","link":"https:\/\/www.cjmsteelgroup.com\/es\/news\/"},{"label":"ASTM A709 Steel Grade Selection Guide: 50, 50W Weathering Steel &amp; HPS 70W for Bridge Projects","link":"https:\/\/www.cjmsteelgroup.com\/es\/astm-a709-steel-plate-grades-bridge-weathering-application.html"}],"medium_url":"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE-300x169.jpg","thumbnail_url":"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE-150x150.jpg","full_url":"https:\/\/www.cjmsteelgroup.com\/wp-content\/uploads\/2025\/08\/A709-STEEL-PLATE.jpg","_links":{"self":[{"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/posts\/6901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/comments?post=6901"}],"version-history":[{"count":8,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/posts\/6901\/revisions"}],"predecessor-version":[{"id":8300,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/posts\/6901\/revisions\/8300"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/media\/7664"}],"wp:attachment":[{"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/media?parent=6901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/categories?post=6901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cjmsteelgroup.com\/es\/wp-json\/wp\/v2\/tags?post=6901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}