All-in-One Overview of High Strength Steel Plates Types and Grades

High strength steel refers to a group of steel grades with high yield strength, typically above 345 MPa, designed for demanding structural and industrial applications. From building bridges to manufacturing automotive parts, these plates offer better performance at lower weight, making them ideal for both strength and cost-efficiency.

If you’re sourcing internationally, whether you’re in Asia, the Middle East, Africa or Europe, understanding the available high strength steel grades and their specific uses can help you make more informed decisions.

Below, we cover the key types of high strength steel plate products, common concerns raised by buyers, and recommended applications — each linking to more detailed product pages.

Structural Steel Plate (Q345B, Q355B, S355JR)

This is the most widely used type of high strength structural steel, ideal for general construction, building frames, heavy equipment, and welded parts.

Buyers care about:

• Is Q355B equivalent to S355JR in strength and welding performance?
• Can I get consistent flatness for laser or plasma cutting?
• Which grades are available with Z-direction testing (Z15/Z25)?

🔗 Explore Structural Steel Plate →

Weathering Steel Plate (Q355NH, Q295NH, Corten A/B)

These plates combine high strength steel properties with excellent atmospheric corrosion resistance — widely used for exposed steel structures, containers, and architecture.

Buyers are concerned with:

• Will this grade require painting or is bare exposure acceptable?
• Can Corten B be laser cut cleanly?
• Does Q355NH meet the mechanical standards of structural steels?

🔗 Explore Q355NH Q295NH Weathering Steel →

🔗 Explore Corten A/B Weathering Steel →

Boiler & Pressure Vessel Steel (Q245R, Q345R)

Used for high-pressure environments, this high strength steel grade ensures performance under elevated temperature and pressure. It is the go-to material for tanks, boilers, and pressure cylinders.

Buyers ask:

• Is Q345R certified to GB713, and are 3.1 MTCs available?
• What is the max thickness available with guaranteed impact resistance?
• Can you offer N+T (normalizing + tempering) delivery condition?

🔗 Explore Boiler & Pressure Vessel Steel →

Pipeline Steel Plate (API 5L X42–X80, L245–L485)

Pipeline steels must be high in strength but also ductile and crack-resistant, suitable for oil & gas transportation and structural piping.

Buyers commonly ask:

• Is API 5L X70 or X80 available in PSL2?
• Are CVN impact results at -20°C or -40°C provided?
• Can plates be used for SAWL spiral pipe production?

🔗 Explore Pipeline Steel Plate →

Wind Tower Steel Plate (Q345E, Q420E)

Wind tower plates must endure fatigue, wind load, and weather exposure. They require excellent welding performance and toughness at low temperatures.

Common buyer concerns:

• Do the plates include Z-direction testing?
• What’s the availability for 2500mm+ width plates?
• Are UT (ultrasonic test) and CVN impact testing included in price?

🔗 Explore Wind Tower Steel →

Automotive High Strength Steel (QSTE Series, DP Series)

Used in chassis, safety cages, and body parts, automotive high strength steel must balance strength and formability for modern manufacturing.

Buyers often check:

• Is QSTE500TM suitable for stamping?
• Do you offer DP500, TRIP600, or AHSS types?
• Are sheets available with oiled/skin-passed surface?

🔗 Explore Automotive Steel Plate →

High Strength Steel Plate (Q460, Q550, Q690)

This group represents the highest high strength steel grades, used in mining equipment, offshore rigs, and high-rise structures.

Buyers want to know:

• What is the preheating temperature for welding Q690?
• Are high thicknesses (60–100mm) available in Q550 or Q460E?
• Does this grade meet EN 10025-6 or Chinese GB/T1591?

🔗 Explore High Strength Steel Plate →

Bridge Steel Plate (Q370qE, Q420qD, Q500qE)

Developed for bridges and infrastructure, these high strength structural steel plates must deliver high ductility, fatigue resistance, and long-term durability.

Buyers care about:

• Is CTOD or fracture toughness data available?
• Can these grades be used in long-span or railway bridges?
• Are welded joints qualified to AWS or D1.1 standards?

🔗 Explore Bridge Steel Plate →

At CJM Steel, we supply high strength structural steel plates to demanding industries across Europe, the Middle East, Southeast Asia, and South America, with a growing presence in countries such as Italy, Germany, Vietnam, Saudi Arabia, and Brazil. Whether you’re looking for a high strength structural steel plates supplier in Italy or sourcing large-volume orders globally, our experienced team ensures on-time delivery, custom grades, and professional support tailored to your project needs.

Email: info@cjmstainlesssteel.com

WhatsApp: +86 181 9190 6640