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Type 302 Stainless Steel
Description
 Type 302 (UNS S 30200) stainless steel is an austenitic chromium-nickel stainless steel, nonhardenable 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
Ingots, Slabs, Hot bands, Sheet, Strip

Typical Applications

  • Antennas--auto and radar
  • Automotive and architectural trim
  • Baking equipment
  • Bar and fountain equipment
  • Bottling machinery
  • Dairy processing equipment
  • Food processing equipment
  • Home appliances
  • Hospital equipment
  • Industrial floor plate
  • Jewelry
  • Kitchen and restaurant
Chemical Composition
Carbon Manganese Silicon Chromium Nickel
0.15 max. 2.00 max. 1.00 max. 17.00/19.00 8.00/10.00

Typical Material Properties
Finish/
Condition		 Yield
Strength
psi		 Tensile
Strength
psi		 Elongation
in 2 in.,
%		 Hardness
Rockwell
B
No. 1/2D Finish,
annealed		 38,000 88,000 56 79
No. 2/2B Finish,
skin passed		 46,000 90,000 55 87

Processing

  • 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.
  • Hardening
    Type 302 can be hardened only by cold working. See table of Typical Mechanical Properties.
  • Stress Relieving
    The recommended temperature range for stress relieving is 400-750°F.

Hot Working

  • Initial forging and pressing temperature--2100-2300°F.
  • Finishing temperature--1500°F.
  • For upsetting operations, the finish temperature should be above 1700°F.

Forming
Type 302 can be formed into most shapes. It will, however, work harden so that it may be necessary to anneal when severe forming is performed, the annealing being an intermediate process.

Physical Properties
Density
lb./cu. in.		 Modulus of
Elasticity
in Tension
x 10^6, psi		 Specific
Heat
Btu/°F/lb		 Thermal
Conductivity
Btu/hr/ft^2/ft/		 Mean Coefficient
of Thermal Expansion
per °F(x 10^-6)		 Melting
Point
Range		 Electrical
Resistivity
microohn-cm
32-212 °F °F °F °F @ 70 °F
0.29 28.0 0.12 212 932 32-212 32-600 32-1000 32-1200 2550/2590 72
9.4 12.4 9.6 9.9 10.2 10.4

Elevated Temperature Strength
Creep Strength,
load for 1% elong
10,000 hr,psi		 Temperature
1000 °F 1100 °F 1200 °F 1300 °F
17,000 12,000 7000 4000

Welding
Type 302 is adaptable to welding by electric arc, gas fusion or electrical resistance processes. Since the material may be subject to carbide precipitation during welding, it is possible that areas adjacent to the weld may have poorer resistance to chemical attack. Restoration of normal corrosion resistance can be obtained by heating to 1750-2000°F and cooling rapidly. If subsequent annealing is impractical, then Type 304 with 0.08 maximum carbon, one of the 0.03 maximum carbon grades such as Type 304L or one of the stabilized grades, Type 321 or 347, should be used. Type 308 filler metal electrodes are used for welding Type 302.

Corrosion
Type 302 stainless steel in the annealed condition is highly resistant to corrosive conditions in atmospheres of urban, rural and seashore locations. It is quite resistant to most organic acids.

Oxidation
For continuous service, excellent resistance to oxidation is obtained up to 1650°F. For intermittent heating and cooling applications, a temperature of 1500°F should not be exceeded. The alloy will suffer carbide precipitation if heated in the range of 800-1600°F and, in such condition, is subject to intergranular corrosion.
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