What is 420 made of
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What is 420 made of
420 stainless steel is a kind of Martensitic stainless steel, with certain wear resistance and corrosion resistance, high hardness characteristics, suitable for all kinds of precision machinery, bearings, electrical, equipment, instruments, meters, transportation vehicles, household appliances and so on. It is widely used in the manufacture of parts resistant to atmospheric, water vapor, water and oxidizing acid corrosion.
In practical applications, the steel that is resistant to the corrosion of weak corrosive media is often called stainless steel, and the steel that is resistant to the corrosion of chemical media is called acid-resistant steel. Due to the difference in the chemical composition of the two, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.
The vast majority of stainless steel products require good corrosion resistance, such as one or two types of tableware, kitchenware, water heaters, drinking fountains, etc., some foreign businessmen also do corrosion resistance tests on products: warm to boiling with NACL solution, dump the solution after a period of time, wash and dry, call weight loss, to determine the degree of corrosion (note: When polishing the product, because the emery cloth or sandpaper contains Fe components, it will lead to rust spots on the surface of the test.
When the number of chromium atoms in steel is not less than 12.5%, the electrode potential of steel can be changed dramatically, from negative potential to positive electrode potential. Prevent electrochemical corrosion.
The corrosion resistance of stainless steel decreases with the increase of carbon content, so the carbon content of most stainless steel is low, the maximum is not more than 1.2%. The main alloying element in stainless steel is Cr (chromium), and only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, the general Cr (chromium) content of stainless steel is at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.
