Generally, post-weld heat treatment is not required, unless large cross-sections are welded, or weld decay may occor. Type 304 stainless steel has excellent weldability and does not require preheating. Welding of AISI 304 Grade Stainless Steel But it’s not resistant to halide (such as chloride, fluoride, etc.) corrosion, because the halide can easily penetrate the passive film and make stainless steel lose the resistance. The reason why SS 304 material does not rust is because the Cr and Fe in it are oxidized to form a dense passive film to prevent further corrosion.ĪISI 304 stainless steel has excellent corrosion resistance in mild atmosphere and fresh water, and even the surface will not rust. As the amount of martensite in the steel increases, its strength increases and its plasticity decreases. Cold working will transform a part of austenite into martensite. Type 304 Stainless Steel Heat Resistance Maximum service temperature in airĬonventional austenite such as AISI 304 stainless steel cannot be hardened by heat treatment, because they will not change their crystal lattice structure when heated, so they can only be hardened by cold working. When wire is specified in straightened and cut lengths, the minimum tensile strength shall be 90 % of the values listed in the table. ASTM A276 Type 304 Stainless Steel Mechanical PropertiesĪnnealed, Cold finished, Dia ≤ 1/2 in (12.7mm)Īnnealed, Cold finished, Dia > 1/2 in (12.7mm)ĪSTM A240 Type 304 Steel Mechanical PropertiesĪSTM A313 Type 304 Stainless Steel Spring Wire Tensile Strength Requirements
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