304 steel plate and 304L steel plate are mainly different in carbon content. The carbon content of 304 steel plate is less than or equal to 0.08. And the carbon content of 304L steel plate is less than or equal to 0.03.
Besides, 304 steel plate is a versatile stainless steel, which is widely used in the manufacture of equipment and parts requiring good comprehensive performance. And 304L steel plate is variant of 304 steel plate with low carbon content. 304L steel plate is used for occasions where welding is needed. Low carbon content of 304L steel plate minimizes carbide precipitation in the HAZ near the weld, which may lead to intergranular corrosion of stainless steel in some environments.
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