42CrMo4+QT Steel bar| DIN 1.7225-EN10083
42CrMo4/DIN 1.7225 Alloy Steel manufacturers and 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.
1.Chemical Composition
| 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 |
2.Related Specifications
ASTM:4140
JIS:SCM440
BS:EN19/708M40
GB:42CrMo
3.Heat Treatment & Mechanical Property
42CrMo4 Normalizing Diagram
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 Annealing Diagram
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 |
42CrMo4 Quenching Diagram
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.
42CrMo4 Tempering Diagram
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 |
4.Supply Size & Condition
| Form of Supply | Size(mm) |
| Round bar | Φ16-Φ1,000 |
| Square bar | Thinkness:Max 800 |
| Flat bar/Blcoks | Thickness :120-800 Width:120-1,500 |
Heat treatment:Normalized / Annealed / Q&T
Surface finish:Black / Rough turned / Peeled