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420 is a hardenable martensitic stainless steel that contains at least 12% chromium, just enough to provide corrosion resistance. It has good ductility in the annealed condition, but can be hardened to a minimum Rockwell hardness of 50 HRC, which is the highest hardness in the 12% chromium scale. Due to its hardening properties, 420 are not often welded, although this is possible. Martensitic stainless steel is designed for high hardness, and sometimes other properties will be affected to a certain extent. The corrosion resistance is lower than that of ordinary austenite grades, and its effective operating range is limited by its ductility loss at sub-zero temperatures and strength loss due to excessive tempering at high temperatures. The best corrosion resistance is obtained when the metal is hardened and subjected to surface grinding or polishing.
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202 stainless steel is an austenitic chromium-nickel-manganese alloy. It has high ductility, good corrosion resistance and excellent toughness in both high and low temperature environments. 202 stainless steel is one of the most widely used 200 series stainless steel. 202 stainless steel, the austenitic structure is stabilized by the addition of nickel and manganese, thereby preventing the formation of harmful phases, such as sigma phase or chromium carbide. The high nickel content also improves the corrosion and oxidation resistance of the steel at high temperatures.
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301 grade stainless steel is a common austenitic stainless steel with good corrosion resistance and high carbon content, and can be cold worked to various temperatures. Among stainless steels, 301 is the most easily strengthened steel by cold deformation. Cold deformation processing can improve the strength and hardness of steel, and retain sufficient plasticity and toughness. In addition, this steel has good rust resistance under atmospheric conditions, but its corrosion resistance in reducing media is poor, and its corrosion resistance in chemical media such as acid, alkali and salt is poor. Therefore, it is not recommended for corrosive environments.
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430 grade is a ferritic, straight chromium, non-hardenable grade that combines good corrosion resistance and formability characteristics with useful mechanical properties. Its resistance to nitric acid attack allows it to be used in specific chemical applications, but automotive trim and electrical components represent its largest areas of application.
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439 steel is in the ordinary ferrite material (430) on the basis of reducing the content of C, while adding Ti and other stabilizing elements, so that the steel intergranular corrosion resistance, formability and weldability are improved. Compared with the 304 steel, although the elongation is low (about 30%), but the strength, corrosion resistance, and corrosion resistance is better than 200 series materials.
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