What is the composition of stainless steel?

Fe: the basic component of stainless steel;

C: Carbon has a dual character in stainless steel, on the one hand, stabilizing austenitic elements, mechanical aspects to improve strength. On the other hand, the increase in carbon content, the more chromium in the carbide formed with carbon, can significantly reduce the corrosion resistance of steel.

Cr: is the basic element of stainless steel, determines the corrosion resistance of stainless steel, through the surface formed chrome-rich oxide film, protect steel from oxidation erosion.

Ni: Chromium and nickel work together to make stainless steel corrosion-resistant. The addition of 9% nickel to 18% chromium-containing steel can make the stainless steel obtain austenitic structure and improve the corrosion resistance of steel.

Mo: significantly improve the corrosion resistance of media containing chloride ions and organic acids.

Si and Al: Improve THE OXIDATION resistance of chromium steel. With 5% chromium and 1% steel, the oxidation resistance is equal to that of 12% chromium steel.

Boron: Adding a trace amount of boron to austenitic stainless steel can improve the thermal plasticity and thermal strength of steel.

There are many kinds of stainless steel, different performance; According to the structure: divided into Martensite stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic ferrite duplex stainless steel and other four categories; According to the main chemical composition of steel or steel in some characteristic elements to classify: chromium stainless steel, chromium nickel stainless steel, chromium nickel molybdenum stainless steel and low carbon stainless steel, high molybdenum stainless steel, high purity stainless steel, etc.; According to the performance characteristics and use of steel classification: into nitric acid resistance stainless steel, sulfuric acid resistance stainless steel, pitting corrosion resistance stainless steel, stress corrosion resistance stainless steel, high strength stainless steel, etc.; According to the functional characteristics of steel classification: low temperature stainless steel, magnetic stainless steel, free cutting stainless steel, superplastic stainless steel, etc.. At present, the commonly used classification method is based on the structure characteristics of steel, the chemical composition characteristics of steel and the combination of the two methods. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, etc., or divided into chromium stainless steel and nickel stainless steel two categories. Stainless steel is commonly used in corrosion-resistant environments, as well as in medical devices and household products.

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