High Strength Q355NH / Q295NH Weathering Steel Plate for Structural and Container Applications

Q355NH and Q295NH Weathering Steel Plate

Long-Lasting Performance in Harsh Outdoor Environments

Q355NH and Q295NH are Chinese national standards (GB/T 4171) for weathering steel plate known for their excellent corrosion resistance and mechanical strength. These steel grades develop a protective oxide layer when exposed to air, preventing further corrosion and reducing maintenance needs, making them ideal for outdoor and harsh environment applications.

At CJM Steel, we offer reliable wholesale weathering steel plate solutions with fast delivery worldwide, customizable thickness, size, and surface processing — ideal for structural, engineering, and decorative projects.

Key advantages:

• Excellent corrosion resistance in open-air conditions
• Cost-effective alternatives to Corten A / ASTM A588
• High weldability and machinability
• Long service life with minimal maintenance

Typical Applications:

Q355NH and Q295NH steel plates are widely used in:

• Container manufacturing and shipping industries
• Wind power towers and structural supports
• Bridges, buildings, and outdoor infrastructure
• Railway vehicles and heavy equipment
• Agricultural machinery and storage tanks

Their strong corrosion resistance and mechanical properties help extend service life and reduce maintenance cost in exposed environments.

Specifications and Standards

Standard	Grade	Thickness (mm)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
GB/T 4171	Q355NH	3-40	≥355	490-630	≥20
GB/T 4171	Q295NH	3-40	≥295	430-580	≥21

Chemical Composition (%)

Element	C	Si	Mn	P	S	Cu	Ni	Cr	Nb
Q355NH	≤0.20	0.30	1.00	≤0.035	≤0.035	0.25	0.30	0.30	≤0.10
Q295NH	≤0.22	0.30	1.20	≤0.035	≤0.035	0.20	0.25	0.20	≤0.10

Mechanical Properties

Grade	Thickness (mm)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Energy (J) at -20℃
Q355NH	3-16	≥355	490-630	≥20	≥27
Q355NH	16-40	≥345	470-630	≥20	≥27
Q295NH	3-16	≥295	430-580	≥21	≥27
Q295NH	16-40	≥285	410-580	≥21	≥27

Dimensions & Supply Options

• Thickness: 2mm – 100mm
• Width: Up to 3000mm
• Length: Up to 12000mm or customized
• Standards: GB/T 4171, Mill Certificate EN 10204 3.1 available
• Processing: Laser cutting, plasma cutting, CNC bending, drilling, surface treatment
• Packaging: Steel pallet + anti-rust film + seaworthy protection
• Shipping terms: FOB / CIF / DDP – supported for Southeast Asia, Middle East, South America, EU & Africa

Why Choose Q355NH and Q295NH Weathering Steel Plate?

• Outstanding atmospheric corrosion resistance
• High yield and tensile strength
• Good weldability and cold forming properties
• Cost-effective alternative to imported weathering steels
• Suitable for a wide range of thicknesses and customized sizes

Packaging & Shipment

• Packing Type: Standard seaworthy packaging
• Delivery Time: 7–15 working days after order confirmation
• Customized Sizes: Available based on project needs
• Port: Tianjin / Qingdao / Shanghai
• MOQ: 1 ton

Why Choose CJM Steel for Corten Products?

• Direct Factory Supply with full certification
• Export Experience in 40+ Countries
• Custom Processing: cutting, bending, beveling
• In-Stock Grades: Fast dispatch from warehouse

Related Products

• Corten Steel Plate Supplier
• ASTM A709-50W Weathering Steel Plate
• Impact Resistant Steel Plate for Cold Weather Use

Request a Quote

Need Q355NH or Q295NH weathering steel plate quotes?
Contact CJM for wholesale prices, technical support, and rapid export.

Email: info@cjmstainlesssteel.com
WhatsApp: +8618191906640

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