E STEEL SDN. BHD.
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AISI 4140 | SCM440 | 709 Steel | EN19 High Tensile Steel Plate

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AISI 4140 Suppliers - SCM440, 42CrMo4, 709 High Tensile Steel Equivalent , 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

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): ≧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 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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