Type 304 stainless steel is basically the same as Type 302 except for a higher chromium and lower carbon content. Its lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. In many instances, Type 304 can be used in the “as welded” condition while Type 302 must be annealed in order to retain adequate corrosion resistance.
Type 304 has the same excellent combination of strength, corrosion resistance and workability as Type 302, and it costs the same. Consequently this type is widely used and is more popular than type 302.
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