42CrMoA belongs to ultra-high strength steel, with high strength and toughness, hardenability is also good, no obvious tempering brittleness, tempering treatment after higher fatigue limit and resistance to multiple impact ability, low temperature impact toughness is good. The steel is suitable for the manufacture of large and medium plastic moulds requiring certain strength and toughness.
Chemical composition:
42CRMOA
42CRMOA
C0.38 ~ 0.45.
Si0.17 ~ 0.37.
Mn0.50 ~ 0.80.
Cr0.90 ~ 1.20.
Mo0.15 ~ 0.25
Steel mill spot specifications
Round steel specification list
The product name
Specifications/mm
The material
Cold drawn round light
Ф 3.0-100
42CrMoA
Hot rolled round steel
Ф. 100-200
42CrMoA
Hot rolled round steel
Ф 20-100
42CrMoA
Hot rolled round steel
Ф. 200-400
42CrMoA
Mechanical properties:
Tensile strength σ B (MPa) : ≥1080(110)
Yield strength σs (MPa) : ≥930(95)
Elongation δ5 (%) : ≥12
Section shrinkage ψ (%) : ≥45
Impact power Akv (J) : ≥63
Impact toughness value α kV (J/cm2) : ≥78(8)
Hardness: 217 hb or less
Sample size: Sample blank size is 25mm
:(quenched 850 degrees; Coolant: oil; Tempering temperature 560 degrees; Coolant: water, oil);
Mechanical properties: tensile strength MPa1080, yield point MPa930, elongation %12, section shrinkage %45, impact absorption
Work Ak63, steel annealed or high temperature tempered supply state Brinell hardness HBW≤217;
Used for forgings requiring higher strength or larger section than 35CrMo steel, such as big gear for locomotive traction, supercharger drive teeth
Wheel, rear axle, engine cylinder, 1200~2000m oil deep well drill pipe joint and fishing tools, etc., can be replaced with
Tempered steel with higher nickel.
Its corresponding International Standard Organization number :42CrMo4
Corresponding Japanese brand: SCM440
Corresponding to German brand: 42CrMo4 or 1.7225
Approximate equivalent to the American brand: 4140 or G41400
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