Stainless steel 304, also known as AISI 304 or UNS S30400, is the most widely used austenitic stainless steel in industrial applications. For manufacturers of safety and survival equipment looking to sell on Alibaba.com, understanding the precise specifications of 304 grade is essential for meeting buyer expectations and international quality standards.
- Chromium (Cr): 17.5-19.5%
- Nickel (Ni): 8-10.5%
- Carbon (C): 0.08% max
- Manganese (Mn): 2.0% max
- Silicon (Si): 0.75% max
- Phosphorus (P): 0.045% max
- Sulfur (S): 0.03% max
- Iron (Fe): Balance [1]
The chromium content forms a passive oxide layer on the surface, providing corrosion resistance, while nickel stabilizes the austenitic structure, giving 304 its characteristic formability and toughness. This composition makes 304 suitable for a wide range of safety equipment applications, from survival kit components to emergency shelter frames.
- Tensile Strength: 500-750 MPa (72-108 ksi)
- Yield Strength (0.2% offset): 205-550 MPa (30-80 ksi) minimum
- Elongation: 40-60% in 50mm
- Hardness: 70-90 HRB (Rockwell B)
- Density: 8.0 g/cm³ [1]
These mechanical properties make 304 stainless steel ideal for components that require both strength and formability. For safety equipment manufacturers, this means 304 can be easily fabricated into complex shapes while maintaining structural integrity under stress—a critical requirement for emergency and survival gear.
Stainless Steel 304: Key Property Specifications
| Property | Value | Testing Standard | Application Relevance |
|---|---|---|---|
| Chromium Content | 17.5-19.5% | ASTM A240 | Corrosion resistance foundation |
| Nickel Content | 8-10.5% | ASTM A240 | Austenitic structure stability |
| Tensile Strength | 500-750 MPa | ASTM A370 | Load-bearing capacity |
| Yield Strength | 205 MPa min | ASTM A370 | Permanent deformation threshold |
| Elongation | 40% min | ASTM A370 | Formability for fabrication |
| Hardness | 70-90 HRB | ASTM E18 | Wear resistance indicator |

