Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 20Mn2 alloy structural steel / 20Mn2 steel plate / 20Mn2 steel bars / 20Mn2 coil / 20Mn2 strip / 20Mn2 steel pipe / 20Mn2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20Mn2-alloy structural steel 
 Standard: GB / T 699-1999 
 The main characteristics of 
 With moderate intensity. Cold deformation of the plastic, good low temperature properties, welding and cutting is acceptable. Compared with the corresponding carbon content of carbon steel, high hardenability in oil critical hardenability diameter of 4 ~ 15 mm, but the heat treatment of overheating, decarburization sensitivity and tendency to temper brittleness. 
 [Application Examples] 
 Used to make less demanding on the surface and center section size diameter <50mm carburized parts, replace the piston pin of 20Cr steel production carburizing pinion axis, the low requirements, such as the manufacture of automobiles, tractors and machine tools Cross pin head, sleeve diesel engine, the valve plunger, transmission control, steel sleeve. In addition, the steel in the hot-rolled and normalized condition can also be used in the manufacture of the riveting pieces and screws, nuts. 
 Chemical composition 
 【Chemical Composition (%): 
 Carbon C: 0.17 ~ 0.24 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 1.40 ~ 1.80 
 Phosphorus P: "0.025 
 SS: "0.025 
 Chromium Cr: ≤ 0.30 
 Ni - Ni: ≤ 0.30 
 Copper Cu: ≤ 0.25 
 Mechanical properties 
 Mechanical Properties]. 
 Tensile strength> = 785MPa 
 Yield limit> = 590MPa 
 Elongation> = 10% 
 Reduction of> = 40% 
 Absorbed energy> = 47Aku2 / J 
 Hardness: ≤ 187HB 
 Heat treatment process 
 Tempering temperature / ℃ 220 coolant water. Empty heat treatment: quenching (water, oil quenching) first quenching 850 and tempering (water, air-cooled), carburizing 
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