Type 302
Type 302 (UNS S30200) in Coil Form Description Type 302 is an austenitic chromium-nickel stainless steel that is available in the annealed and cold worked conditions. Type 302 is a higher carbon, earlier version of Type 304 stainless steel, and many 302 applications have switched to Type 304...
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Type 302 (UNS S30200) in Coil Form
Description
Type 302 is an austenitic chromium-nickel stainless steel that is available in the annealed and cold worked conditions. Type 302 is a higher carbon, earlier version of Type 304 stainless steel, and many 302 applications have switched to Type 304 with the improvements in melting technology. Type 302 is non-magnetic in the annealed condition but becomes magnetic as a result of cold working.
Type 302 is corrosion resistant in many environments, and the corrosion properties are similar to that of 304/304L stainless steel. The susceptibility to carbide precipitation during welding restricts the use of Type 302 in some applications and 304L is used because of its lower carbon content for welded applications.
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Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*
| Element | 302 |
| Carbon | 0.15 |
| Chromium | 17.0-19.0 |
| Nickel | 8.0-10.0 |
| Manganese | 2.00 |
| Silicon | 0.75 |
| Nitrogen | 0.10 |
| Phosphorus | 0.045 |
| Sulfur | 0.030 |
* Maximum, unless range is indicated
Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240
| Property | 302 |
| Yield Strength, min. (ksi) | 30 |
| Tensile Strength, min. (ksi) | 75 |
| Elongation, min. (%) | 40 |
| Hardness, max. (Rb) | 92 |
Mechanical property requirements for cold worked flat rolled products as specified in ASTM A666
| Condition | Yield Strength (ksi) min. |
Tensile Strength (ksi) min. |
Elongation % min. in 2 in. | |
| <0.015 in. | ≥0.015 in. | |||
| ¼ Hard | 75 | 125 | 10 | 12 |
| ½ Hard | 110 | 150 | 9 | 10 |
| ¾ Hard | 135 | 175 | 5 | 6 |
| Full Hard | 140 | 185 | 3 | 4 |
Physical Properties
Physical properties for Type 302 stainless steel
| Property | 302 |
| Density, lb/in3 | 0.29 |
| Modulus of Elasticity, psi | 29.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 9.2 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.4 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 27.4 |
302 Stainless Steel is an austenitic chromium-nickel stainless steel that is available in the annealed and cold worked conditions. 302 is a higher carbon, earlier version of 304 stainless steel, and many 302 Stainless applications have switched to 304 with the improvements in melting technology. 302 Stainless is non-magnetic in the annealed condition but becomes magnetic as a result of cold working.
302 Stainless Steel is corrosion resistant in many environments, and the corrosion properties are similar to that of 304 stainless steel. The susceptibility to carbide precipitation during welding restricts the use of Type 302 in some applications and 304L is used because of its lower carbon content for welded applications.
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