AISI 4140 | SCM440 | 709 Steel | EN19 High Tensile Steel Plate
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 | |||||||||||
| 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¡æ Furnace Cooling
- Normalization: 830~880¡æ Air Cooling
- Hardening: 830~880¡æ Oil Cooling
- Tempering: 530~630¡æ Rapid Cooling
