18CrNiMo7-6 Case-Hardening Steel
1.6587
- EN1.6587
- EN18CrNiMo7-6
- AISI~4820
High-hardenability chromium-nickel-molybdenum case-hardening steel. Provides high core strength and toughness in large sections; preferred for heavily loaded large gears.
01Material Properties
- Core Rm 1100–1400 MPa
- High hardenability; large sections
- Very good toughness
- High surface fatigue (pitting) resistance
- Deep carburising possible (2–4 mm)
02Applications
- Large gears and planetary gears
- Wind turbine and gearbox gears
- Heavy vehicle driveline components
- Large-section shafts
- Mining and lifting equipment
03Delivery Condition
- Soft annealed (max. 229 HB) or +FP; forgings and cut blocks.
04Heat Treatment
Typical values
- Soft annealing
- 650–700 °C; max. 217 HB
- Carburising
- 880–980 °C; 0.5–2 mm case depth
- Hardening
- 815–855 °C, oil
- Tempering
- 160–220 °C, 1–2 h
- Surface hardness
- 58–62 HRC
- Core
- Rm ≈ 1100–1400 MPa
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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