42 crmoa mechanical properties and chemical composition
 
Mechanical properties
 
Tensile strength σ b (MPa) : 1080 (110) or
Yield strength σ s (MPa) : 930 (95) or
Elongation δ 5 (%) : 12 or more
Reduction of area ψ (%) : was 45
Impact work Akv (J) : 63 or more
Impact toughness value α kv (J/cm2) : was 78 (8)
Hardness: acuities 217 hb
Sample size: sample blank dimensions to 25 mm
[2] : (quenching 850 degrees; cooling agent: oil; tempering temperature 560 degrees; cooling agent: water, oil);
Mechanics performance, tensile strength MPa1080, yield point MPa930, elongation % 12, reduction of area % 45, shock absorption
Work Ak63, steel annealing or high temperature tempering supply state brinell hardness HBW acuities were 217;
use
Used for more than 35 crmo steel demand higher strength or section more forgings, such as locomotive traction wheel, supercharger drive tooth
Wheel, axle, engine cylinder, 1200 ~ 2000 m deep petroleum well drill pipe joint and fishing tools, can replace contain
Nickel higher quenched and tempered steel.
The corresponding international standards organization brand: 42 crmo4
Corresponding Japanese brand: SCM440
Corresponding German brand: 42 crmo4 or 1.7225
Approximate corresponding American brand: 4140 or G41400
Chemical composition
 
C0.38 ~ 0.45,
Si0.17 ~ 0.37,
Mn0.50 ~ 0.80,
Cr0.90 ~ 1.20,
Mo0.15 ~ 0.25