Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 30Cr alloy structural steel / 30Cr steel plate / 30Cr steel bars / 30Cr steel coils / 30Cr steel strip / 30Cr steel pipe / 30Cr steel wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 30Cr alloy structural steel. Unified digital code: A20302 
 Chemical composition (mass fraction) (%) 
 Carbon C: 0.27 ~ 0.34 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.50 ~ 0.80 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 860; coolant: Oil 
 Second quenching temperature (℃): - 
 Heating tempering temperature (° C): 500; coolant: water, oil 
 Tensile strength σb (MPa): ≥ 885 (90) 
 Yield strength σs (MPa): ≥ 685 (70) 
 Elongation δ5 (%): ≥ 11 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 47 
 The impact toughness αkv (J/cm2): ≥ 59 (6) 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 187 
 The main characteristics of 
 This steel compared with 30 steel, strength and hardenability in oil critical hardenability in diameter, 8 ~ 34mm in the water critical hardenability diameter of 19 ~ 56mm. Cold deformation of steel plasticity and secondary welding annealing or high-temperature tempering, good machinability. 
 [Application Examples] 
 This steel is usually used in the quenched and tempered condition, also can be used after normalizing for the manufacture of important mechanical wear and friction conditions, or in a large impact load, such as axes, axis, the balance lever rocker, rod, bolts, nuts, gears, and a variety of roller and so on. In addition, this steel can be used as a high-frequency surface hardening steel for the production that require high surface hardness and wear resistance of parts. 
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