Good translation of the Metal Products (Shanghai) alloy structural steel companies (domestic alloy structural steel / alloy structural steel imports) 20mnvb alloy structural steel / 20mnvb steel plate / 20mnvb steel bars / 20mnvb coil / 20mnvb strip / 20mnvb steel pipe / 20mnvb wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20MnVB, alloy structural steel. Unified digital code: A73202 
 Chemical composition (mass fraction) (%) 
 C: 0.17 ~ 0.23 
 Si: 0.17 ~ 0.37 
 Mn: 1.20 ~ 1.60 
 B: 0.0005 ~ 0.0035 
 V: 0.07 to 0.12 
 Mechanical Properties]. 
 Sample blank size (mm): 15 
 Heat treatment: 
 First quenching temperature (° C): 860; coolant: Oil 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 200; coolant: water, air 
 Tensile strength (σb / MPa): ≧ 1080 
 Yield point (σs of / MPa): ≧ 885 
 ≧ 10 the Elongation (δ5 /%): 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 55 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 
 The main characteristics of 
 This is a better performance of carburized steel, its characteristics are similar, with 20CrMnTi 20CrNi steel with high strength, abrasion resistance and quench permeability, the critical oil hardenability diameter of 27 ~ 53mm. Compared with good machinability of steel, carburizing and heat treatment process performance, high temperature and long cementite grain growth tendency, and along the carburized layer the carbon concentration decreased gentle, does not cause mutation of the organization and performance. they can direct cooling after carburizing, quenching; compared with 20CrMnTi steel, the drawback is the quenching distortion decarburization more. This steel can be used for 20CrMnTi, 20Cr,, 20CrNi of steel. 
 [Application Examples] 
 Used in the manufacture of small and medium-sized cementite parts modulus larger, heavier load. Such as: heavy machine tools, gears and shafts, car rear axle active, passive gear. 
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