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the Stainless Steel

Stainless steelIntroduction: Stainless Steel (Stainless Steel) refers to the resistance to weak corrosive medium such as air, steam, water and acid, alkali, salt and other chemical etching medium corrosion of the Steel, also called acid-proof Stainless Steel.In practical application, often called the weak corrosive medium corrosion resistant steel stainless steel, and called the resistance to chemical corrosion medium steel acid-resistant steel.Due to the chemical composition on the difference between the two, the former does not necessarily medium resistance to chemical corrosion, while the latter are generally not rust.The corrosion resistance of stainless steel depends on the alloy element content in the steel.Stainless steel alloy elements and basic nickel, molybdenum, titanium, niobium, copper, nitrogen, etc, in order to meet the requirements of various applications on the microstructure and mechanical properties of stainless steel.Stainless steel easy to chlorine ion corrosion, because of the chromium, nickel, chlorine isotopic elements, isotopic elements will be swapping assimilation to form the corrosion of stainless steel.1 chemical compositionThe corrosion resistance of stainless steel decreases with the increase of carbon content, and therefore, most of the stainless steel and carbon content are low, the largest of no more than 1.2%, some steel Wc (carbon content) and even lower than 0.03% (such as 00 cr12).The main alloying element in stainless steel is a Cr (Cr), only when the Cr content reaches a certain value, the steel corrosion resistance.Therefore, general Cr stainless steel (chrome) content of at least 10.5%.Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si and Cu elements.Two main categoriesStainless steel often according to the state of organization can be divided into: martensite steel, ferritic steel, austenitic steel, austenitic (two-phase) - ferrite stainless steel and precipitation hardening stainless steel, etc.In addition, according to ingredients can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel, etc.Stainless steel1, ferritic stainless steel, chromium containing 12% ~ 30%.Its corrosion resistance, toughness and weldability with chromium content increases with the increase of chloride stress corrosion resistance is superior to other types of stainless steel, fall into this category of Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28, etc.Ferritic stainless steel because of the high chromium content, corrosion resistance and oxidation resistance are relatively good, but the mechanical properties and process performance is poorer, more used to stress less acid structure and steel used as antioxidant.This kind of steel to withstand atmosphere, nitric acid and corrosion of the brine solution, and has good high temperature oxidation resistance, low thermal expansion coefficient, etc, used in nitric acid and food factory equipment, also can make work under high temperature parts, such as gas turbine parts, etc.