Good translation of the Metal Products (Shanghai) alloy structural steel companies (domestic alloy structural steel / imports of alloy structural steel) 20crni3 alloy structural steel / steel plate 20crni3 / 20crni3 steel bars / 20crni3 coil / 20crni3 strip / 20crni3 steel pipe / 20crni3 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20CrNi3, an alloy structural steel grades of the Chinese national standard. Uniform digital code: A42202. 
 Chemical composition 
 Mass fraction (%): 
 C: 0.17 ~ 0.24 
 Si: 0.17 ~ 0.37 
 Mn: 0.30 ~ 0.60 
 Cr: 0.60 ~ 0.90 
 Ni: 2.75 ~ * 
 Mechanical properties 
 [Sample blank dimensions 
 25mm 
 [Heat] 
 Quenching temperature (° C): 830; coolant: water, oil 
 Heating tempering temperature (° C): 480; coolant: water, oil 
 Mechanical Properties]. 
 Tensile strength (σb / MPa): ≧ 930 
 Yield point (σs of / MPa): ≧ 735 
 Elongation (δ5 /%): ≧ 11 
 Section shrinkage rate (ψ /%): ≧ 55 
 Absorbed energy (Aku2 / J): ≧ 78 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 241 
 Key Features 
 Good mechanical properties after quenching and tempering or quenching and tempering, also better low temperature impact toughness. This steel-sensitive tendency to have white spots and high temperature tempering have a tendency to temper brittleness. Quenching to the semi-martensitic hardness, oil quenching hardenability can Φ50 ~ 70mm. Good machinability, weldability medium. 
 Application examples 
 Used for manufacturing high-load conditions, work gear, shaft, worm screws, stud bolts, pins, and so on. 
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