SAE 302 Stainless Steel (Annealed bar) vs SAE 304 Stainless Steel (Annealed and cold drawn)
Property comparison of SAE 302 Stainless Steel (Annealed bar) and SAE 304 Stainless Steel (Annealed and cold drawn), both stainless steel.
| Property | SAE 302 Stainless Steel (Annealed bar) | SAE 304 Stainless Steel (Annealed and cold drawn) | Difference |
|---|---|---|---|
| Yield strength | 240 MPa | 415 MPa | +73% |
| Tensile strength | 585 MPa | 690 MPa | +18% |
| Elongation | 60 % | 45 % | -25% |
| Elastic modulus | 193,000 MPa | 193,000 MPa | 0% |
| Shear modulus | 74,231 MPa | 74,231 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,850 kg/m³ | 7,850 kg/m³ | 0% |
| Brinell hardness | 147 HB | 212 HB | +44% |
| Thermal conductivity | 15.1 W/m·K | 15.1 W/m·K | 0% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000016 1/K | 0.000016 1/K | 0% |
| Melting point | 1,400 °C | 1,400 °C | 0% |
Difference is SAE 304 Stainless Steel (Annealed and cold drawn) relative to SAE 302 Stainless Steel (Annealed bar). Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- 302
- standard
- SAE
- heat treatment
- Annealed bar
- grade
- 304
- standard
- SAE
- heat treatment
- Annealed and cold drawn
About 300-series stainless steels
Austenitic stainless steels gain corrosion resistance from chromium and nickel and are non-magnetic in the annealed condition. 304 covers most general-purpose work; 316 adds molybdenum for chloride and seawater service. They cannot be hardened by heat treatment and rely on cold work for higher strength.
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