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42CrMo4 Alloy Steel
BS EN 42crmo4 Alloy Steel is a common chromium-molybdenum steel that usually used after quenched and tempered, with high intensity, high hardenability. BS EN 42CrMo4 round steel has better performance than 34CrMo4 steel due to the carbon and chromium content is higher. 42CrMo4 alloy steel has higher strength and hardenability. The 42CrMo4 alloy material also has high fatigue strength and good low-temperature impact toughness. The temper brittleness is not obvious.
Equivalent DIN standard 1.7225
Applications
Analysis
Forging
Annealing
Hardening
Heat treatment
Applications
EN 42CrMo4 alloy steel is widely used for engineering steel purposes, such as: making various kinds of machinery, automobile, mining spare part, the gearwheel of the engine, the driving gear of supercharger, the connecting rob, the pinchcock under the high pressure, parts for power train applications, cold formed fastener components, shafts, gears, drill collars for the oil exploration, etc.
Analysis
| Carbon | 0.38-0.48% | Silicon | 0.35% max |
| Manganese | 0.60-0.90% | Phosphorous | 0.025% max |
| Chromium | 0.90-1.20% | Sulphur | 0.035% max |
| Molybdenum | 0.15-0.30% |
Forging
Pre heat the steel carefully, then raise temperature to 850°-1200°C for forging. Do not forge below 850°C. After forging it is recommended to cool slowly in still air.
Annealing
Heat the 42CrMo4 slowly to 680°-700°C. Cool in air.
Hardening
This steel grade is commonly supplied in a ready heat treated condition. If further heat treatment is required annealed 42CrMo4 should be heated slowly and uniformly to 860°-890°C and after adequate soaking at this temperature quench in oil. Temper as soon as the steel reaches room temperature.
Heat treatment
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 42CrMo4 alloy steel.
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