JIS SCM440 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.
1. Supply Range of SCM440 Plate
| Thickness | Width | Length | Surface Finish |
| 1mm~6mm cold rolled, by new production, MOQ 5 tons, |
Big Plate: 2000~2300mm
Flat Bar: 200~1300mm |
2000~6000mm | Black Surface, Machined, Milled. |
| 4mm~300mm hot rolled, *Over 10000 tons daily stock |
*We supply finished pieces, milled to tolerance / roughtness pieces.
2. Relevant JIS SCM440 Steel Specification and Equivalent Steel Grades
| Country | Japan | USA | German | British |
| Standard | JIS G4105 / JIS 4053 | ASTM A29 | EN 10083 | BS 970 |
| Grades | SCM440 | 4140 | 1.7225/ 42CrMo4 |
EN19 |
3. Material SCM440 Equivalents Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| JIS G4105 | SCM440 | 0.38-0.43 | 0.60-0.85 | 0.03 | 0.03 | 0.15-0.35 | 0.9-1.2 | 0.15-0.30 |
| ASTM A29 | 4140 | 0.38-0.43 | 0.75-1.00 | 0.035 | 0.040 | 0.15-0.35 | 0.8-1.10 | 0.15-0.25 |
| EN 10250/ EN 10083 |
42CrMo4/ 1.7225 |
0.38-0.45 | 0.6-0.9 | 0.035 | 0.035 | 0.4 | 0.9-1.2 | 0.15-0.30 |
| BS 970 | EN19 | 0.36-0.44 | 0.7-1.0 | 0.035 | 0.035 | 0.1-0.4 | 0.9-1.2 | 0.20-0.40 |
4. 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
5. Heat Treatment of SCM440 Steel
- Annealing: 830℃ Furnace Cooling
- Normalization: 830~880℃ Air Cooling
- Hardening: 830~880℃ Oil Cooling
- Tempering: 530~630℃ Rapid Cooling
6. Applications of SCM440 Steel Plate
Generally, JIS SCM440 steel plate material is used for automative industry as mold steel or for manufacturing of parts. But some customers will also use SCM440 for other general machine structural use.
7. Our Customers
