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420U6 Stainless Steel｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）
A specialty hardened martensitic with carbon pushed higher than 420; after quench-and-temper it reaches higher hardness and wear resistance than ordinary 420, intended for high-hardness cutlery and wear parts; corrosion resistance remains at the martensitic level and is limited.
420U6不锈钢
MartensiticA specialty hardened martensitic with carbon pushed higher than 420; after quench-and-temper it reaches higher hardness and wear resistance than ordinary 420, intended for high-hardness cutlery and wear parts; corrosion resistance remains at the martensitic level and is limited.
Standards
| GB (China) | ≈30Cr13/40Cr13系（专用硬化料） |
|---|---|
| EN (Europe) | ≈420系高碳（近似） |
| ASTM/UNS (USA) | ≈420系（近似） |
| JIS (Japan) | ≈SUS420J2系（近似） |
For a few high-chromium ferritic and specialty hardened grades the EN/JIS equivalents differ between mills; marked with ≈ — rely on the mill certificate composition when ordering.
Chemical composition (wt%)
| Chemical composition (wt%) | % |
|---|---|
C | ≈0.36–0.45（专用高碳） |
Si | ≤1.00 |
Mn | ≤1.00 |
Cr | 12.0–14.0 |
Density：7.70 g/cm³
Performance
A specialty hardened martensitic with carbon pushed higher than 420; after quench-and-temper it reaches higher hardness and wear resistance than ordinary 420, intended for high-hardness cutlery and wear parts; corrosion resistance remains at the martensitic level and is limited.
Use cases
Premium knives, shears, industrial blades and edge/wear parts demanding high hardness and edge retention.
Characteristics
Heat-treatable to higher hardness with good edge retention; a specialty stock — confirm exact composition and heat-treat window with the mill.
Pitfalls & cautions
Related grades
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