What is SUS304 stainless steel?
Jan 06, 2026
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SUS304 is a classic austenitic stainless steel defined by the Japanese Industrial Standards (JIS). It is one of the most widely used stainless steel grades globally, valued for its balanced corrosion resistance, formability, and cost-effectiveness.
Core Identity & Equivalent Grades
UNS Number: S30400
ASTM/AISI Equivalent: 304 stainless steel
EU EN Equivalent: 1.4301
Chinese GB Equivalent: 06Cr19Ni10
Key Chemical Composition (wt%)
| Element | Content Range |
|---|---|
| Chromium (Cr) | 18.00–20.00 |
| Nickel (Ni) | 8.00–10.50 |
| Carbon (C) | ≤0.08 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
Main Properties
Corrosion Resistance: Resists mild acids, alkalis, atmospheric rusting, and freshwater corrosion. Not recommended for highly corrosive environments (e.g., seawater, concentrated chloride solutions).
Formability & Weldability: Excellent ductility for deep drawing, bending, and stamping; can be welded via common methods (TIG, MIG) without post-weld heat treatment.
Mechanical Performance: Annealed tensile strength ≥515 MPa, yield strength ≥205 MPa, elongation ≥40%. Cold working can significantly improve its strength.
Non-Magnetic: It is non-magnetic in the annealed state; cold working may induce weak magnetism.
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