304L stainless steel bar is a basic austenitic steel, a variant of 304 stainless steel with a lower carbon content, designed for applications requiring welding. The lower carbon content minimizes carbide precipitation in the heat-affected zone near the weld. Under normal conditions, its corrosion resistance is similar to that of 304 steel. However, after welding or stress relief, it exhibits excellent resistance to intergranular corrosion. Even without heat treatment, it maintains excellent corrosion resistance, with an operating temperature range of -196°C to 800°C. It is used in outdoor machinery in the chemical, coal, and oil industries, where intergranular corrosion resistance is critical, as well as in heat-resistant building materials and parts that are difficult to heat treat.