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304L

UNS S30403

The low carbon variant of 304 having a carbon content less than 0.035% provides enhanced post-welding corrosion resistance. The low carbon content prevents carbide precipitation during heating and cooling through the critical range of 800 °F to 1,500 °F. Alloys 304 and 304L are the most susceptible of the austenitic stainless steels to stress corrosion cracking (SCC) because of their relatively low nickel content. This alloy is most resistant in the stress-relieved condition. SCC is caused by exposure of parts containing residual stresses to halides at temperatures above 120 °F.