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In general, 304 stainless coil has high plasticity and corrosiveness. When other alloying elements are added, it also has good plasticity when forming single-phase solid solution. For example, iron-nickel alloy can form continuous solid solution, so the plasticity of iron-nickel alloy is very high in any proportion.
However, in the presence of other elements, the formation of intermetallic compounds insoluble in solid solution or partially soluble in solid solution reduces the plasticity of metals, so the plasticity of alloys is worse than that of pure metals or single-phase solid solutions. Then, to introduce the role of alloy elements in 304 stainless steel coil composition:
Iron (Fe): is the basic metal element of stainless steel coil.
Chromium (Cr): is the main ferrite forming element. The combination of chromium and oxygen can form a corrosion-resistant Cr2O3 passivation film, which is one of the basic elements to maintain the corrosion resistance of stainless steel coils. The increase of chromium content can improve the repair ability of the passivation film of steel. Generally, the chromium content of 304 stainless steel coils must be above 18%.
Carbon (C): is a strong austenite forming element, which can significantly improve the strength of steel, in addition, carbon has a negative impact on corrosion resistance.
Nickel (Ni): is the main austenite forming element, which can slow down the corrosion of steel and the growth of grain during heating.
Molybdenum (Mo): is a carbide forming element. The carbide formed is very stable. It can prevent the grain growth during austenite heating and reduce the superheat sensitivity of steel. In addition, molybdenum can make the passivation film more compact and firm, thus effectively improving the Cl-corrosion resistance of stainless steel coils.
Niobium and Ti (Nb, Ti): Strong carbide forming elements, which can improve the intergranular corrosion resistance of steel. However, titanium carbide has a negative impact on the surface quality of 304 stainless steel sheet, so the performance of stainless steel coils with higher surface requirements is generally improved by adding niobium.
Nitrogen (N): is a strong austenite forming element, which can significantly improve the strength of steel. However, the aging cracking of stainless steel coils is greatly affected, so nitrogen content should be strictly controlled in stamping stainless steel coils.
Phosphorus and sulphur (P, S): are harmful elements in 304 stainless steel coils, which have adverse effects on corrosion resistance and stamping performance of stainless steel coils. Http://www.dzstainless.com/
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