302 stainless steel is an Austenitic, non-magnetic, extremely tough and ductile stainless steel alloy. AISI 302 annealed stainless steel is highly corrosion resistant and maintains its strength at high temperatures up to 550°F (288°C). Additionally, 302 stainless steel is non-magnetic in the annealed condition and cannot be further hardened by heat treatment. As an added benefit both the hardness and tensile strength of AISI 302 can be increased by cold working.
| 302 |
| ASTM A240 |
| ASTM A666 |
| ASME SA240 |
| AMS 5515 (annealed) |
| AMS 5516 (annealed) |
| AMS 5903 (¼ hard) |
| AMS 5904 (½ hard) |
| AMS 5905 (¾ hard) |
| AMS 5906 (full hard) |
Two important considerations in producing weld joints in the austenitic stainless steels are: (1) preservation of corrosion resistance, and (2) avoidance of cracking.
A temperature gradient is produced in the material being welded which ranges from above the melting temperature in the molten pool to ambient temperature at some distance from the weld. The higher the carbon level of the material being welded, the greater the likelihood that the welding thermal cycle will result in the chromium carbide precipitation which is detrimental to corrosion resistance. To provide material at the best level of corrosion resistance, low carbon material (Type 304L) should be used for material put in service in the welded condition. Alternately, full annealing dissolves the chromium carbide and restores a high level of corrosion resistance to the standard carbon content materials.
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