Brief introduction of 42CrMo steel plate:
42CrMo steel plate belongs to ultra-high strength steel with high strength and toughness, good hardenability, no obvious tempering brittleness, high fatigue limit and multiple impact resistance after quenching and tempering treatment, and good low temperature impact toughness. 42CrMo steel plate is suitable for manufacturing large and medium plastic moulds which require certain strength and toughness.
42CrMo steel plate physical property:
1) critical point temperature (approximate value): AC1=730 Degree C, AC3=800 Degree C, MS=310 Degree C.
2) Linear expansion coefficient: temperature 20~100°C/20~200°C/20~300°C /20 ~400°C/20~500°C /20~600°C, linear expansion coefficient: 11.1×10K/12.1×10K/12.9×10K/13.5×10K/13.9×10K14.1×10K.
3) Elastic modulus: temperature 20°C/300°C/400°C/500°C/600°C, elastic modulus 210000MPa/185000MPa/175000MPa/165000MPa/155000MPa
42CrMo steel plate Material properties:
42CrMo steel plate has high creep strength and rupture strength at high temperature. 42CrMo steel plate is usually quenched and tempered as heat treatment. As a plastic mold steel, 42CrMo steel plate has excellent workability and good mechanical properties.
Equivalent steel grades of 42CrMo:
ISO standard: 42CrMo4
Japanese standard: SCM440
German standard: 42CrMo4
US standard: 4140
Chemical composition of 42CrMo steel plate:
Carbon C:0.38 to 0.45%
Silicon Si:0.17 to 0.37%
Manganese Mn:0.50 ~ 0.80%
Sulfur S: allowable residual content less than 0.035%
Phosphorus P: allowable residual content is less than 0.035%.
Chromium Cr:0.90 to 1.20%
Nickel Ni: the allowable residual content is less than 0.030%.
Copper Cu: allowable residual content is less than 0.030%.
Molybdenum Mo:0.15 ~ 0.25%
Mechanical property of 42CrMo steel plate:
Tensile strengthσb (MPa)：≥1080(110)
Yield strengthσs (MPa)：≥930(95)
Elongationδ5 (%)：≥12
Section shrinkage ratioψ (%)：≥45
Impact work Akv (J): greater than 63
The impact toughness valueαkv (J/cm2)：≥78(8)
Hardness: less than 217HB
sample size: sample blank size is 25mm
Characteristics and application scope of 42CrMo steel plate:
High strength, hardenability, toughness, hardening deformation is small, high temperature creep strength and rupture strength are basic characteristics of 42CrMo steel plate. 42CrMo steel plate is used to manufacture forgings requiring higher strength and greater quenching and tempering section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, pressure vessel gears, rear axles, heavily loaded connecting rods and spring clamps, as well as drill pipe joints and fishing tools for deep oil wells up to 2000m underneath, and for bending machines mold and so on.
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