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Basic knowledge of stainless steel | knowledge of stainless steel pipe

by:HHGG     2021-04-27
Basic knowledge of stainless steel 2016-10-13 Stainless steel refers to steel that is resistant to weak corrosive media such as air, steam, and water, and chemically corrosive media such as acid, alkali, and salt. It is also called stainless acid-resistant steel. In practical applications, steel that is resistant to corrosion by weak corrosive media is often called stainless steel, and steel that is resistant to chemical media is called acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to corrosion by chemical media, while the latter is generally non-corrosive. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel. The basic alloying elements of stainless steel include nickel, chromium, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and performance of stainless steel. Stainless steel is easily corroded by chloride ions, because chromium, nickel, and chlorine are isotopic elements, and the isotopic elements will exchange and assimilate to form corrosion of stainless steel. ■1, 201 stainless steel 201 stainless steel has certain acid and alkali resistance, high density, no bubbles, no pinholes, etc. It is used to produce various watch cases and watchband bottom cover materials. Mainly used to make decorative tubes, industrial tubes, and some shallow stretched products. 201 Chemical composition: (Cr) Chromium: 13.50~15.0(Ni) Nickel: 1.02-1.28% (C) Carbon: ≤0.15(Mn) Manganese: 5.5~7.50(Si) Silicon: ≤0.75(Cu) Copper: Semi-copper 0.8% high copper 1.5%(N) Nitrogen: ≤0.25(P) Phosphorus: ≤0.060(S) Sulfur: ≤0.030201 Stainless steel density: 7.93g/cm3 ■2, 304 stainless steel 304 stainless steel is a universal stainless steel material, The anti-rust performance is stronger than 200 series stainless steel materials. The high temperature resistance is also better, and the general use temperature limit is less than 650℃. 304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion. For oxidizing acids, it is found in experiments that 304 stainless steel has strong corrosion resistance in nitric acid with a concentration of ≤65% and below the boiling temperature. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids. 304 chemical composition: Ni (nickel): 8.0~11.0Cr (chromium): 17.0~19.0C (carbon): ≤0.07Si (silicon): ≤1.0Mn (manganese): ≤2.0S (sulfur): ≤0.03P( Phosphorus): ≤0.035304 stainless steel density: 7.93g/cm3  
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