25CrMo4 (4130) Engineering Steel
1.7218
- EN1.7218
- EN25CrMo4
- AISI4130
- UNSG41300
Low-carbon chromium-molybdenum quenched and tempered steel. Tougher and more weldable than 42CrMo4; suited to medium-strength welded structures and fasteners.
01Material Properties
- Rm 700–900 MPa (+QT)
- Good weldability (with preheating)
- High toughness
- Good formability
- Carburising also possible
02Applications
- Welded structural tubes and frames
- Aerospace structural parts (4130)
- Bolts, studs and fasteners
- Pressure vessels and flanges
- Shafts and axles (medium load)
03Delivery Condition
- Quenched and tempered (+QT), normalised (+N) or annealed (max. 212 HB).
04Heat Treatment
Typical values
- Soft annealing
- 680–720 °C; max. 212 HB
- Normalising
- 845–885 °C, air
- Hardening
- 850–880 °C; water or oil
- Tempering (QT)
- 550–670 °C, 1–2 h
- After QT (+QT)
- Rm 700–900 MPa, Rp0.2 ≥ 450 MPa (≤ 100 mm)
- Surface hardening
- Induction / flame; nitriding possible
Heat treatment cycle (schematic)
Tempering diagram (approximate)
Values are approximate and for information only; they vary with section size, heat and furnace conditions. Binding values are determined from the manufacturer’s data under laboratory conditions.
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