DESCRIPTION
Type 302 Stainless Steel is an austenitic chromium-nickel stainless steel, non-hardenable by thermal treatments. It may be cold worked to high tensile strengths with slightly lower ductility than Type 301. Its corrosion resistance is superior to that of Type 301. Type 302 is essentially nonmagnetic in the annealed condition and becomes slightly magnetic when cold worked.
PRODUCT FORMS
Sheet, Strip
SPECIFICATIONS
ASTM A240, A666
TYPICAL APPLICATIONS
Automotive and architectural trim, springs, kitchen and restaurant equipment and utensils, dairy and food processing equipment.
PROCESSING
Hardening: Type 302 can be hardened only by cold working. Annealing: Heat in the range of 1850-2050°F and cool rapidly. Light gauges under 16 gauge may be air cooled. Heavier sections require water quenching from annealing temperature. Stress Relieving: The recommended temperature range for stress relieving is 400-750°F.
WELDING
Type 302 is weldable by electric arc, gas fusion or electrical resistance processes. In heavy sections, the material may develop poor resistance to chemical attack due to carbide precipitation in the heat affected region of the weld. Restoration of normal corrosion resistance can be obtained by heating to 1750-2000°F and cooling rapidly. If subsequent annealing is impractical, then Type 304L or one of the stabilized grades should be used. Type 308 filler metal is used for welding Type 302.
CORROSION
Type 302 stainless steel in the annealed condition is highly resistant to corrosive conditions in urban and rural environments. It is resistant to most organic acids.
FORMING
Type 302 can be formed into most shapes. It work hardens rapidly, so it may be necessary to anneal between forming steps.
| Type | Yield Strength 0.2% offset (KSI) | Tensile Strength (KSI) | % Elongation (2” Gauge Length) |
| 302 Ann | 30 min. | 75 min. | 40.0 min. |
| 302 1/4 Hard | 75 min. | 125 min. | 12.0 min. |
| 302 1/2 Hard | 110 min. | 150 min. | 10.0 min. |
| 302 3/4 Hard | 135 min. | 175 min. | 6.0 min. |
| 302 Full Hard | 145 min. | 185 min. | 4.0 min. |
| Element | Type 302 |
| Carbon | 0.15 max. |
| Manganese | 2.00 max. |
| Sulfur | 0.030 max. |
| Phosphorus | 0.045 max. |
| Silicon | 0.75 max. |
| Chromium | 17.00 – 19.00 |
| Nickel | 8.00 – 10.00 |
| Nitrogen | 0.10 max. |
PHYSICAL PROPERTIES: ANNEALED
Density @ RT: 0.29 lb./in^2; Modulus of Elasticity in Tension: 28.0 psi x 10^6; Specific Heat: 0.12 BTU/°F/lb. from 32 to 212°F; Thermal Conductivity: 9.4 at 212°F and 12.4 at 932°F; Mean Coefficient of Thermal Expansion: 9.6 from 32 to 212°F, 9.9 from 32 to 600°F, 10.2 from 32 to 1,000°F, and 10.4 from 32 to 1,200°F; Electrical Resistivity: 72 micro ohms-cm at 70°F; Melting Point Range: 2550/2590°F; Oxidation Resistance: 1650°F continuous service and 1500°F intermittent service.
Phone: 847-257-6570
Phone: +52.811.6363844
Phone: 615-793-4700
