High-Performance Weathering Steel Plates for Railway & Highway Bridge Construction Projects

Overview

CJM is a trusted Chinese manufacturer and exporter of Q355NH Bridge Steel Plate and Q295NH Weathering Steel, offering comprehensive solutions for global infrastructure developers. These plates are manufactured under the GB/T 4171 standard, specially engineered for outdoor structural applications such as bridges, flyovers, marine platforms, and highway support systems.

Designed with enhanced corrosion resistance and high mechanical strength, Q355NH / Q295NH steel plates reduce maintenance costs and extend the lifespan of bridge structures. CJM supports both bulk and custom orders with full technical documentation and global delivery support.

Comparison: Q355NH vs. Other Bridge Steel Grades

Feature	Q355NH	S355J2W (EN)	ASTM A588 (US)
Standard	GB/T 4171 (China)	EN 10025-5 (EU)	ASTM A588 (USA)
Corrosion Resistance	Very Good	Excellent	Excellent
Strength	High	High	High
Common Use	Domestic & Export	EU Bridges, Architecture	US Infrastructure
Weldability	Good	Excellent	Good
Coating Required	Not Necessary	Not Necessary	Not Necessary

Q355NH is often preferred in Asian and African infrastructure projects due to cost-effectiveness and similar performance to European/US equivalents.

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Dimensions of Q355NH / Q295NH Steel Plate

Parameter	Range / Details
Thickness	4–100 mm
Width	1000–3000 mm
Length	2000–12000 mm
Edge	Mill edge / Cut edge
Surface Finish	Natural rust / Sandblasted / Painted
Cutting Service	Available (plasma, flame)
Marking	Standard or Customized

Note: Custom dimensions can be produced according to drawing or project specs. MOQ applies.

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Chemical Composition – GB/T 4171

Grade	C ≤	Si	Mn	P ≤	S ≤	Cu	Cr	Ni ≤
Q295NH	0.14	0.20–0.65	≤ 1.50	0.035	0.030	0.20–0.60	0.40–0.70	0.65
Q355NH	0.16	0.20–0.65	≤ 1.60	0.035	0.030	0.25–0.60	0.40–0.70	0.65

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Mechanical Properties – GB/T 4171

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
Q295NH	≥ 295 (≤16 mm)	430–580	≥ 19
Q355NH	≥ 355 (≤16 mm)	490–630	≥ 19

Thicker plates may have slightly lower yield strength per GB standard tolerance.

Typical Applications of Q355NH / Q295NH Weathering Steel Plates

Q355NH and Q295NH Bridge Steel Plates are widely applied in infrastructure requiring outdoor durability and low maintenance:

• ✔️ Railway bridges and viaducts
• ✔️ Highway overpasses and flyovers
• ✔️ Pedestrian walkways, footbridges, cycle paths
• ✔️ Marine platforms and riverside support beams
• ✔️ Architectural bridge structures and steel frame projects
• ✔️ Urban overpass renovation projects (retrofitting applications)

These corrosion-resistant steel plates form a protective oxide layer (patina) that prevents further rusting and eliminates the need for frequent painting – ideal for long-span bridges in coastal or humid regions.

Why Choose CJM as Your Supplier?

CJM is a trusted Chinese exporter with extensive experience in supplying structural and weathering steel plates for bridge projects worldwide.
We offer:

• ✅ Over 1 million tons in stock annually
• ✅ Fast delivery from Chinese ports
• ✅ Cut-to-size services & CNC processing
• ✅ Strong export packaging

We have served clients in Europe, Southeast Asia, South America, and the Middle East, earning their trust through consistent quality and service.

Packaging & Shipping

• Steel plates are packed with rust-proof wrapping and edge protectors
• Loaded on pallets or steel racks for container shipping
• Tailored packaging solutions are available for specific needs, ensuring optimal protection.

CJM offers fast and efficient shipping to major international markets, and work with trusted logistics partners to guarantee timely delivery and minimize any risk of delay. Our dedicated support team is available to answer any shipping-related inquiries.

Shipping time and cost depend on your location and the order volume. Please contact us for detailed quotes and estimated delivery times for your specific project.

Ready to Start Your Project?

Contact us today for more information on our Bridge Steel Plate and Bridge Steel Coil solutions. We offer competitive pricing and tailored support to meet your project’s specific requirements.

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment