Stainless Steel Grade 321: Titanium-Stabilized High-Temp Steel
Jan 29, 2026
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Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*
| Element | 321 |
| Carbon | 0.08 |
| Chromium | 17.0-19.0 |
| Nickel | 9.0-12.0 |
| Manganese | 2.00 |
| Silicon | 0.75 |
| Nitrogen | 0.10 |
| Phosphorus | 0.045 |
| Sulfur | 0.030 |
| Titanium | 5(C+N) min / 0.70 max |
* Maximum, unless range is indicated
Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240
| Property | 321 |
| Yield Strength, min. (ksi) | 30 |
| Tensile Strength, min. (ksi) | 75 |
| Elongation, min. (%) | 40 |
| Hardness, max. (Rb) | 95 |
Physical Properties
Physical properties for Type 321 stainless steel
| Property | 321 Data |
| Density, lb/in3 | 0.286 |
| Modulus of Elasticity, psi | 28.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 9.2 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.3 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 28.4 |
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