42CrMo alloy structural steel grade is 42CrMo4, the standard is DINENI0083-1-1998.
42CrMo alloy structural steel
Basic Information
Material Name: Alloy Structural Steel
Grade: 42CrMo4
Standard: DINENI0083-1-1998
Material Characteristics
42CrMo steel belongs to ultra-high-strength steel, with high strength and toughness, hardenability is also good, no obvious tempering brittleness, tempering treatment has a high fatigue limit and resistance to multiple impacts, low-temperature impact toughness is good. The steel is suitable for the manufacture of large and medium-sized plastic molds requiring certain strength and toughness. Strength, high hardenability, good toughness, quenching deformation is small, high temperature has high creep strength and enduring strength. Used in the manufacture of 35CrMo steel requirements than the higher strength and tempering cross-section of larger forgings, such as locomotive traction with large gears, supercharger transmission gears, pressure vessel gears, rear axle, loaded with a great deal of connecting rods and spring clamps, but also can be used for 2000m below the oil drilling rod joints and salvage tools and can be used for bending machine molds and so on.
After tempering treatment has a high fatigue limit and resistance to multiple impacts, good low-temperature impact toughness, high creep strength and endurance strength at high temperatures. The steel is usually tempered and then surface quenched as a heat treatment program.
Physical Properties
1: Critical point temperatures (approximate): Ac1=730°C, Ac3=800°C, Ms=310°C.
2: Coefficient of linear expansion:Temperature 20~100°C/20~200°C/20~300°C /20 ~400°C/20~500°C /20~600°C,Coefficient of linear expansion: 11.1×10K/12.1×10K/12.9×10K/13.5×10K/13.9×10K14.1×10K.
3: modulus of elasticity: temperature 20°C/300°C/400°C/500°C/600°C,modulus of elasticity 210000MPa/185000MPa/175000MPa/165000MPa/15500oMPa
Chemical composition
Carbon C ：0.38～0.45%
Silicon Si: 0.17～0.37%
Manganese Mn：0.50～0.80%
Sulfur S ：allowed residual content≤0.035
Phosphorus P : Allowable residual content ≤0.035%
Chromium Cr ：0.90～1.20%
Nickel Ni: allowed residual content ≤ 0.030%
Copper Cu: allow residual content ≤ 0.030%
Molybdenum Mo：0.15～0.25%
Mechanical properties
Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5 (%): ≥12
Section shrinkage ψ (%): ≥45
Impact work Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness ：≤217HB
Process specification
Thermal processing specification
Heating temperature 1150 ~1200°C, start temperature 1130 ~1180°C, termination temperature > 850°C, slow cooling when φ> 50mm.
Normalizing specification
Normalizing temperature 850~900°C, air cooling.
High temperature tempering specification
Tempering temperature 680~700°C, air-cooled.
Quenching and tempering specification
Preheating temperature 680~700°C, quenching temperature 840~880°C, oil-cooled, tempering temperature 580°C, water-cooled or oil-cooled, hardness ≤217HBW.
Sub-temperature quenching and toughening treatment specifications
Quenching temperature 900°C, tempering temperature 560°C, hardness (37±1) HRC
Induction hardening and tempering specifications
Quenching temperature 900°C, tempering temperature 150~180°C, hardness 54~60HRC.
Typical applications
1)Suitable for making medium and large molds.
2) It is a plastic mold steel with a hardness of 30HRC and has a wide range of uses.
3) Suitable for wear resistance, toughness, roughness requirements of large mold cavity.
4)Suitable for the production of medium and large plastic molds requiring a certain degree of strength and toughness.
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