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400 Series Stainless Steel


400 series stainless steel is an iron, carbon and chromium alloy. This stainless steel has a martensitic structure and an iron element and therefore has normal magnetic properties. 400 series stainless steel has a strong resistance to high-temperature oxidation and compared with carbon steel, its physical properties and mechanical properties have been further improved. Most 400 series stainless steel can be heat treated.

Commonly used 400 series of stainless steel varieties containing chromium 18% 430 and chromium 13% of the 410 and 420 stainless steel models, 430 stainless steel models which use the largest. 430 stainless steel model is characterized by the low price, thermal expansion coefficient is small, resistance to chloride stress corrosion is better than 300 series stainless steel varieties; but its shortcomings is that the forming performance, weldability and tensile strength less than 300 series stainless steel, Therefore, its use area is limited. In the case of the same amount of chromium, such as in the atmosphere, fresh water and nitric acid oxidation medium, 400 series stainless steel varieties corrosion resistance and 300 series of stainless steel varieties, and usually 400 series stainless steel varieties corrosion resistance is better than 200 series stainless steel varieties The 400 series stainless steel varieties currently add trace niobium, titanium, copper and aluminum elements can improve its deep drawing performance, weldability, corrosion resistance and high-temperature strength, can be partially replaced by 300 series stainless steel models. At present, add the above trace elements after the 400 series of stainless steel varieties of models are SUS430LX, 430JIL, 444,445M2, NSS447M1 and so on. The US and Japan use these models for automotive exhaust (type 409 and 410L), washing machine inner cylinder (430), kitchen utensils, household appliances, medical equipment, water heaters, roof panels, curtain walls and power plant equipment.