In some cases, the low carbon Type 304L alloy may show a lower corrosion rate than the higher carbon Type 304 alloy. The data for formic acid, sulfuric acid and sodium hydroxide illustrate this. Otherwise, the Types 302, 304, 304L and 305 alloys may be considered to perform equally in most corrosive environments. A notable exception is in environments sufficiently corrosive to cause intergranular corrosion of welds and heat-affected zones on susceptible alloys. The Type 304L alloy is preferred for use in such media in the welded condition since the lower carbon level enhances resistance to intergranular corrosion.
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 |
Alloy 302 is a slightly higher carbon version of 304, often found in strip and wire forms. It is a tough, ductile grade that demonstrates comparable corrosion resistance, is non-magnetic, and is not hardenable by heat treatment. Alloy 302 is usually used in its annealed condition and has a high ease of fabrication and formability.
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