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Q235NH Q355NH Q355GNH Domestic Weathering Steel Plate | GB/T 4171
- Domestic standard weathering steel complying with GB/T 4171
- Good atmospheric corrosion resistance through Cu, Cr, Ni alloying
- High strength and excellent weldability for structural applications
- Suitable for bridges, buildings, vehicles and outdoor steel structures
- Full MTC available, custom cutting and size processing supported
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Product Overview
Q235NH, Q355NH and Q355GNH are domestic standard weathering steel grades manufactured according to GB/T 4171. They are structural steel plates with atmospheric corrosion resistance, widely used in bridges, building structures, railway vehicles, engineering machinery and outdoor steel structures.
Q235NH is a low-grade domestic weathering steel with moderate strength and good formability. It is suitable for general structural parts, building components, railway vehicle parts and light-duty outdoor steel structures where atmospheric corrosion resistance is required.
Q355NH is a high-strength domestic weathering steel with good comprehensive mechanical properties. It combines high yield strength, good weldability and atmospheric corrosion resistance, making it suitable for bridges, heavy buildings, engineering machinery and large outdoor steel structures.
Q355GNH is a high-strength weathering steel with better corrosion resistance and toughness. It is suitable for more demanding applications such as railway vehicles, container frames, heavy-duty engineering machinery and important structural components exposed to corrosive outdoor environments.
These grades contain copper, chromium and nickel, which promote the formation of a dense and stable protective rust layer under alternating dry and wet atmospheric conditions. We can supply plates in various thicknesses and support cutting, bending, welding and fabrication according to customer drawings.
Chemical & Mechanical Property Snapshot
Detailed Technical Specifications
Product Comparison Table
App Market
Reliable Steel Coil Solutions For Diverse Industrial Applications
Outdoor Sculpture
Curtain Wall & Planter
Shipping Container
Railway Wagon
Bridge Structure
Power Plant Chimney
Product Packaging
Secure Export Packaging For Safe Handling And Delivery
FAQs
Q235NH has moderate strength for general structures; Q355NH has high strength for heavy structures; Q355GNH has better corrosion resistance and toughness for demanding applications.
Yes, Q355NH is weldable by conventional methods. Preheating may be required for thick plates or high-restraint structures.
Yes, Q355GNH is suitable for railway vehicles, container frames and heavy engineering machinery due to its high strength and good atmospheric corrosion resistance.
Yes, we provide EN 10204 3.1 or 3.2 mill test certificates for each batch, including chemical composition and mechanical properties.
MOQ is 5 tons. In-stock goods can be delivered within 3–7 days, while customized production usually takes 10–25 days.
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