AISI 302 Stainless Steel Common Trade NamesAnnealed 302 stainless steel is known by numerous names, some of the more common labels, include:
UNS S30200
ASTM A666
AISI 302/304
AMS 5513
AMS 5515
AMS 5516
QQ-S-766
SAE J230
Heat Treating AISI 302 Stainless SteelHeat treatments are used to alter the physical and mechanical properties of metal without changing its shape. They are essential processes in metal manufacturing which increase desirable characteristic of metal, while allowing for further processing to take place.AISI 302 stainless steel is delivered in pre-tempered condition, and, no further hardening can be achieved through heat treating. As needed, completed flat springs and sheet metal stampings can undergo a stress-relieving process.
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 |
The austenitic stainless steels are heat treated to remove the effects of cold forming or to dissolve precipitated chromium carbides. The surest heat treatment to accomplish both requirements is the solution anneal which is conducted in the 1850°F to 2050°F range (1010°C to °C). Cooling from the anneal temperature should be at sufficiently high rates through 1500-800°F (816°C – 427°C) to avoid precipitation of chromium carbides.
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