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

Q355NH and Q295NH Weathering Steel Plate

Durable Steel Solution for Harsh Outdoor Environments

Q355NH weathering steel plate and Q295NH weathering steel plate are atmospheric corrosion resistant steels designed for long-term outdoor use. Compared with conventional carbon steel, these materials develop a stable protective rust layer (patina), significantly reducing corrosion rates and maintenance costs.

At CJM Steel, we supply customized q355nh steel plate and q295nh steel plate with flexible sizes, fast delivery, and export-ready packaging for global projects.

What is Q355NH Weathering Steel?

Q355NH is a high-strength low-alloy structural steel under GB/T 4171, specifically developed for atmospheric corrosion resistance. It contains alloying elements such as Cu, Cr, and Ni, which enable the formation of a dense oxide layer that protects the steel surface.

Compared with standard structural steel, q355nh weathering steel plate performs better in environments exposed to rain, humidity, and industrial atmospheres.

Q355NH vs Corten Steel

In international projects, q355nh vs corten steel is a common comparison.

Q355NH is often considered a Chinese alternative to Corten A and ASTM A588 weathering steel. While their corrosion resistance mechanisms are similar, Q355NH provides a cost-effective solution with stable mechanical properties and easier sourcing in Asian supply chains.

For projects requiring corten equivalent china steel, Q355NH is widely used in bridges, containers, and outdoor structures where long-term durability is essential.

Q295NH vs Q355NH Steel

Both grades belong to the weathering steel category, but they differ in strength and application range.

• Q355NH weathering steel plate: Higher yield strength, suitable for heavy structural applications such as bridges and load-bearing components
• Q295NH weathering steel plate: Lower strength but good ductility, ideal for lighter structures and general outdoor fabrication

Choosing between q295nh vs q355nh depends on load requirements, cost considerations, and project specifications.

Applications of Q355NH Weathering Steel Plate

• Containers and Railway Vehicles
  Weathering steel for containers provides enhanced resistance to rain, humidity, and temperature variations, ensuring long service life.
• Architectural and Landscaping Projects
  The natural rust-like appearance of weathering steel makes it popular in facades, sculptures, and outdoor decorative structures.
• Industrial Structures
  Used in storage tanks, heavy equipment, and structural components exposed to harsh environments.
• Bridges and Infrastructure
  Weathering steel for bridges is widely used due to its ability to reduce maintenance costs and improve long-term durability 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 & 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?

• Stable supply of q355nh weathering steel plate and q295nh steel plate
• Export experience across Southeast Asia, Middle East, Africa, Europe, and the Americas
• Custom processing services available
• Fast delivery from stock

Request a Quote

For project inquiries, contact us for q355nh weathering steel plate supply, technical support, and customized solutions.

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