Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 42CrMo alloy steel / 42CrMo steel / 42CrMo steel bar / 42CrMo steel coil / 42CrMo steel / 42CrMo steel / 42CrMo steel (good Translation Metal Products (Shanghai) Co., Ltd.) 
 42CrMo 
 The corresponding ISO grade: 42CrMo4 
 Corresponding to the Japanese brands: SCM440 
 Corresponding to the German grade: 42CrMo4 
 Approximation corresponds to the U.S. grade: 4140 
 ● Features and application: 
 Strength, high hardenability, toughness, and quenching of small deformation, high temperature strength and high creep rupture strength. Requirements for the manufacture of higher intensity than 35CrMo steel and larger cross-section of quenched and tempered forgings, such as the large locomotive traction gears, supercharger drive gear, rear axle, by the great link and spring load can also be used The following 2000m deep oil drill pipe joints and fishing tools, and can be used for bending machine tooling. 
 Main content 
 Chemical composition 
 Carbon C: 0.38 ~ 0.45 
 Si Si: 0.17 ~ 0.37 
 Manganese Mn: 0.50 ~ 0.80 
 Sulfur S: to allow the residual content of ≤ 0.035 
 Phosphorus P: allow the residual content ≤ 0.035 
 Chromium Cr: 0.90 ~ 1.20 
 Ni: to allow the residual content of ≤ 0.030 
 Copper Cu: to allow the residual content ≤ 0.030 
 Mo Mo: 0.15 ~ 0.25 
 Allowable stress of 42CrMo 
 42CrMo allowable stress 186 ~ 310/MPa, yield point 930σs/MPa, 42CrMo strength, high hardenability, toughness, and quenching of small deformation, high temperature strength and high creep rupture strength. 42CrMo 35CrMo steel used in the manufacture of more demanding and higher strength quenched and tempered forging greater cross-section 
 Mechanical properties 
 Tensile strength σb (MPa): ≥ 1080 (110) 
 Yield strength σs (MPa): ≥ 930 (95) 
 Elongation δ5 (%): ≥ 12 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 63 
 Impact toughness αkv (J/cm2): ≥ 78 (8) 
 Hardness: ≤ 217HB 
 Sample size: Sample size is 25mm rough 
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