1.Equivaient grades/Gradi equivalenti
| Germany(DIN) | Japan(JIS) | USA(AISI) | China(GB) |
| 1.7225 | SCM440 | 4140 | 42CrMo |
2.Chemical Composition(%)/Composizione chimica(%)
Grade | Chemical Composition(%) |
| C | Si | Mn | Cr | Ni | Mo | Cu | P | S |
1.7225
| 0.37-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.250 | ≤0.30 | 0.15-0.25 | ≤0.30 | ≤0.035 | ≤0.035 |
| SCM440 | 0.37-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.250 | ≤0.30 | 0.15-0.25 | ≤0.30 | ≤0.035 | ≤0.035 |
| 4140 | 0.37-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.250 | ≤0.30 | 0.15-0.25 | ≤0.30 | ≤0.035 | ≤0.035 |
| 42CrMo | 0.37-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.250 | ≤0.30 | 0.15-0.25 | ≤0.30 | ≤0.035 | ≤0.035 |
3.Characteristic/Caratteristica:
4140 steel, this steel has good processability, small processing deformation, and good fatigue resistance. It is a medium-hardening steel. After 4140 heat treatment, it has good strength and good comprehensive mechanical properties, good manufacturability and finished product rate. High. The maximum operating temperature is 427 degrees Celsius. 4140 strength, high hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures.