GB/T Q500NH Weathering Steel RustProof
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GB/T Q500NH Weathering Steel
By adding controlled amounts of copper, chromium, nickel, and phosphorus, the steel naturally forms a dense, stable oxide layer-commonly called a "patina"-when exposed to alternating wet and dry conditions. This surface film acts as a shield, slowing down further rusting and significantly reducing the need for repainting or heavy coating maintenance.
Typical Chemical Composition (%):
| Element | C | Si | Mn | P | S | Cu | Cr |
|---|---|---|---|---|---|---|---|
| ≤0.12 | 0.20–0.55 | 0.50–1.50 | 0.030–0.120 | ≤0.020 | 0.20–0.50 | 0.40–0.80 | ≤0.65 |
Typical Mechanical Properties:
| Property | Value |
|---|---|
| Yield Strength ≥ | 500 MPa |
| Tensile Strength | 610–760 MPa |
| Elongation (δ5) ≥ | 16% |
With a minimum yield strength of 500 MPa, Q500NH offers higher load-bearing capacity compared with lower grades like Q355NH or Q460NH. This allows engineers to design lighter structures without compromising safety, reducing material usage and overall project weight. The steel maintains good weldability and formability, making it suitable for large-scale fabrication, field assembly, and complex shapes.
Engineers choose Q500NH for three main reasons:
Strength and Efficiency – Higher yield strength enables lighter designs and reduced steel consumption.
Durability – The weathering resistance extends service life, even in aggressive environments.
Low Maintenance – The natural patina helps cut down on coating costs and labor over the structure's lifespan.
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