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The true 302 sheet melt is rare as most are using 304 to apply as 304 and 302 sheet applications. All 304 can qualify as 302 sheet since it is a subset of 302 however not all 302 can be 304.
Annealed Stainless Steel Chemical & Physical Properties
The physical and chemical properties of AISI 302 stainless steel stampings are as follows:
Cr: 17.0 - 19.0%
Ni: 8.0 - 10.0%
Minimum tensile strength: psi x 103 185-230
Modulus of elasticity: psi x 106 28
Maximum operating temperature 550°F (288°C)
Rockwell hardness: C35-45
| Type | Yield Strength 0.2% offset (KSI) | Tensile Strength (KSI) | % Elongation (2″ Gauge length) |
|---|---|---|---|
| 302 Ann | 30 min. | 75 min. | 40 min. |
| 302 ¼ Hard | 75 min. | 125 min. | 12 min. |
| 302 ½ Hard | 110 min. | 150 min. | 10 min. |
| 302 ¾ Hard | 135 min. | 175 min. | 6 min. |
| 302 Full Hard | 145 min. | 185 min. | 4 min. |
When 302 alloy is preferred over 304 since the higher carbon permits meeting of yield and tensile strength requirements while maintaining a higher level of ductility (elongation) versus that of the lower carbon T304.
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