42CRMO4+QT STEEL BAR| DIN 1.7225-EN10083
42CrMo4/DIN 1.7225 Alloy Steel suppliers, supplied with round rods, square/flat bars, rollers, shafts, blocks and forging pieces.
42CrMo4/DIN 1.7225 steel is a commonly used grade contains Chromium-Molybdenum elements in European standard EN10083 and EN10250. This steel has good strength and toughness,and good low-temperature impact toughness which are mostly used after quenched and tempered heat treatment. DIN 1.7225 / 42CrMo4 is widely used in large size and important parts,such as axle,gear,connecting rod,engine cylinder,spring,oil drill pipe joints and pinions.
International Standard
| EU EN |
USA – |
Germany DIN,WNr |
Japan JIS |
France AFNOR |
England BS |
Italy UNI |
Spain UNE |
China GB |
Sweden SS |
Finland SFS |
Russia GOST |
Inter ISO |
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Available Types & Range
42crmo4 Steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ 16 -Φ 200 | Standard or As your request |
| Forged Rounds | Φ 140 – Φ 650 | Standard or As your request |
| Forged Flats | Thickness : 65 – 450 Width: 130 – 650 |
Standard or As your request |
Chemical Composition & Technical Specification –42CrMo4
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 42CrMo4/1.7225 | 0.38-0.45 | ≤ 0.4 | 0.6-0.9 | ≤ 0.025 | ≤ 0.035 | 0.9-1.2 | 0.15-0.3 |
| 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.0 | ≤0.035 | ≤0.035 | 0.8-1.1 | 0.15-0.25 |
Heat Treatment & Mechanical Property
42CrMo4 Steel Normalizinging Details
1.Normalize temperature:850-880℃
2.Three steps for temperature raising.
3.Proper holding time depends on the dimension.
4.Air cooling.
42CrMo4-Mechanical Property With Normalizing
| Tensile Strength | Yield Strength | Elongation | Reduction of Area | Impact Charpy-V | Hardness |
| ≥1020Mpa | ≥655Mpa | ≥17.7% | ≥47% | ≥23J | 302HBW |
42CrMo4 Steel Annealing Details
1.Annealing temperature:680-720℃
2.Enough time for temperature holding
3.Cooling in the furnace.
4.Max hardness:229HB
42CrMo4-Mechanical Property With Annealing
| Tensile Strength | Yield Strength | Elongation | Reduction of Area | Impact Charpy-V | Hardness |
| ≥655Mpa | ≥415Mpa | ≥25.7% | ≥57% | ≥55J | 197HBW |
Quenching Details
1.Quench temperature:820-880℃
2.Three steps of temperature raising for evenly heating.
3.Hold suitable time for the steel to be thoroughly heated.
4.Oil or Water Quench.
5.Tempering immediately after quenched.
Tempering Details
1.Temper temperature:540-680℃
2.Air cooling.
42CrMo4-Mechanical Property With Quenching and Tempering
| Size mm | Tensile,Mpa | Yield,Mpa | Elongation,% | Reduction,% | Charpy Impact,J | Hardness,HB | Sample location |
| Φ230 | 804 | 604 | 23.5 | 57 | +20℃,90 | 270 | 1/3 Radius |
| Φ310 | 879 | 677 | 19.5 | 57 | +20℃,62 | 290 | 1/3 Radius |
| Φ450 | 803 | 566 | 20.5 | 48 | +20℃,54 | 258 | 1/3 Radius |
| Φ540 | 718 | 533 | 21 | 54 | +20℃,56 | 260 | 1/3 Radius |
| Φ700 | 760 | 548 | 19 | 55 | -20℃,28 | 255 | 1/3 Radius |
MATERIAL PROPERTIES OF 42CrMo4 FOR FABRICATION AND HEAT TREATMENT
Steel of Grade 42CrMo4 has the following properties
Machinability
42CrMo4 alloy steel has good machinability in the annealed condition.
Forming
42CrMo4 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.
Welding
42CrMo4 can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.
Heat Treatment
42CrMo4 bars are heated at 845°C followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C for a long period of time followed by air cooling.
Forging
42CrMo4 is forged at 926 to 1205°C.
Hot Working
42CrMo4 steel can be hot worked at 816 to 1038°C.
Cold Working
42CrMo4 alloy steel can be cold worked using conventional methods in the annealed condition.
Annealing
42CrMo4 steel is annealed at 872°C followed by slowly cooling in the furnace.
Tempering
42CrMo4 alloy steel can be tempered at 205 to 649°C depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
Hardening
42CrMo4 alloy steel can be hardened by cold working, or heating and quenching.
