AISI 4140 | SCM440 | EN19 High Tensile Steel Plate

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AISI 4140 | SCM440 | EN19 High Tensile Steel Plate Alloy Steel


AISI 4140 Suppliers - SCM440, 42CrMo4, ASSAB 709, 1.7225, EN19 High Tensile Steel Plate 

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.


Chemical Composition of 42CrMo4 / 709 Steel 

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 4140QT Steel Plate 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

  

Mechanical Properties of 1.7225 High Tensile Steel 

  • Tensile strength (kgf/mm²): R100
  • Yield strength (kgf/mm²): R85
  • Elongation (%): R12
  • Cross section reduction rate (%): R45
  • Impact value (J/cm2): R6
  • Hardness (Hb) : 285~352
 

Heat Treatment of Material 709 Steel

  • Annealing: 830 Furnace Cooling
  • Normalization: 830~880 Air Cooling
  • Hardening: 830~880 Oil Cooling
  • Tempering: 530~630 Rapid Cooling

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