Q345GNH steel plate is a high-strength, low-alloy, weather-resistant steel (also known as corten steel) that meets the Chinese standard GB/T 4171. It is alloyed with elements like copper, chromium, and nickel to form a stable, protective rust layer in outdoor conditions, which eliminates the need for painting in many applications. This makes it suitable for building structures, bridges, and aesthetic applications like facias.
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Q345GNH Chemical composition |
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Grade |
The Element Max (%) |
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Q345GNH
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C |
Si |
Mn |
P |
S |
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≤0.12 |
0.20-0.60 |
0.50-0.90 |
0.07-0.12 |
≤0.035 |
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Cr |
Cu |
Ti |
RE |
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0.25-0.50 |
≤0.03 |
≤0.15 |
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Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
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Grade |
Thickness |
Yield |
Tensile |
Elongation |
Delivery state |
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Q345GNH
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mm |
Min Mpa |
Mpa |
Min % |
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≤6 |
345 |
440 |
22 |
Hot rolling |
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>6 |
Key characteristics
Composition: Alloyed with copper, chromium, and nickel, and also contains phosphorus, which makes it especially well-suited for gas flue applications.
Corrosion resistance: Forms a protective rust-like layer when exposed to the atmosphere, preventing further corrosion.
Strength: It is a high-strength, low-alloy structural steel with a minimum yield strength of 345 MPa.
Applications: Used in bridges, architectural facades, and other outdoor structures where durability and a natural, weathered appearance are desired.
Dimensions: Available in a range of thicknesses, widths, and lengths, which can often be customized.
Standards: Produced according to Chinese standard GB/T 4171 and can also be compliant with other international standards.
