4140 Steel plate

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High Tensile Steel, AISI 4140, SCM440, 42CrMo4, ASSAB 709, 7225, EN19, SCM4
JIS G4105 / JIS 4053 SCM440 is medium carbon chromium molybdenum alloy steel. It is an low alloyed steel containing chromium and molybdenum. SCM440 material has the advantages of stable composition, low harmful elements, high steel purity, small decarburization layer and few surface defects. It’s usually supplied as hardened and tempered condition while some customers also just require hot rolled/as rolled condition. The SCM440 steel material achieves a very good balance between strength, toughness and wear resistance. JIS SCM440 material provides many desirable properties such as good strength and wear resistance, excellent toughness, good ductility and resistance to high-temperature stresses.

DIN AISI JIS Chemical Composition
C Si Mn P S Co Cr Mo Ni V W Cu
42CrMo4 4140H SCM 440H 0.37 to 0.44 0.15 to 0.35 0.65 to 1.10 < 0.04 < 0.03 0.75 to 1.20 0.15 to 1.25 < 0.25 < 0.35

 Common 4140 Steel Specifications

Country USA German British Japan China Australia
Standard ASTM A29 DIN 17200 BS 970 JIS G4105 GB/T 3077 AS 1444
Grades 4140 1.7225/ 42crmo4 42CrMo4 SCM440 42CrMo 4140

  JIS SCM440 Steel Mechanical Properties

  • Tensile strength (kgf/mm²): ≧100
  • Yield strength (kgf/mm²): ≧85
  • Elongation (%): ≧12
  • Cross section reduction rate (%): ≧45
  • Impact value (J/cm2): ≧6
  • Hardness (Hb) : 285~352
Heat Treatment of SCM440 Steel
  • Annealing: 830℃ Furnace Cooling
  • Normalization: 830~880℃ Air Cooling
  • Hardening: 830~880℃ Oil Cooling
  • Tempering: 530~630℃ Rapid Cooling