25CrMo4 steel is a low-alloy steel containing chromium and molybdenum as strengthening elements.It is a versatile alloy with good atmospheric corrosion resistance and reasonable strength up to around 600º F (315º C),and shows good overall combinations of strength, toughness. weldability,machinability and fatigue strength.This materail is generally used in the quenched and tempered condition.25CrMo4 (4130) is a heat-resistant, heat-treatable steel grade that is often used for components with high loads in motorsport, industry and in aviation. Among other things, screws, hydraulic cylinder rod, roll cages, chassis components and vehicle frames are made from this.
| Chemical Composition | ||||||||
| National Standard | Grade | C | Si | Mn | Cr | Mo | P | S |
| DIN | 25CrMo4 (1.7218) | 0.22-0.29 | ≤0.4 | 0.6-0.9 | 0.9-1.2 | 0.15-0.3 | ≤0.025 | ≤0.035 |
| AISI/SAE | 4130 | 0.28-0.33 | 0.15-0.35 | 0.4-0.6 | 0.8-1.1 | 0.15-0.25 | ≤0.035 | ≤0.04 |
| JIS | SCM430 | 0.28-0.33 | 0.15-0.35 | 0.6-0.85 | 0.9-1.2 | 0.15-0.3 | ≤0.035 | ≤0.04 |
| GB | 30CrMo | 0.26-0.34 | 0.17-0.37 | 0.4-0.7 | 0.8-1.1 | 0.15-0.25 | ≤0.035 | ≤0.035 |
Heat Treatment
Normalizing For 25CrMo4
1.Nominal normalizing temperature:840-900°C
2.Hold the temperature for several hours
3.Cooling in the air
Annealing For 25CrMo4
1.Nominal Annealing temperature:680-720°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 229
Hardening and Tempering(Q+T) For 25CrMo4
1.Nominal Hardening temperature:850-880°C
2.Hold at this temperature then quench in oil or water
3.Tempering as soon as possible when the temperature low to ambient
4.Heat uniformly to the suitable temperature of 540-650°C
5.keep the material out of the furnace ,then cool in the air