31CrMoV9 Nitriding Steel
1.8519
- EN1.8519
- EN31CrMoV9
- DIN31CrMoV9
Chromium-molybdenum-vanadium nitriding steel. After QT and nitriding it provides 800–950 HV surface hardness with low distortion; used for precision parts subject to wear and fatigue.
01Material Properties
- Surface 800–950 HV after nitriding
- Core Rm 1000–1200 MPa (QT)
- Very low distortion (nitriding at 500–530 °C)
- High fatigue and wear resistance
- Hardness retained up to 500 °C
02Applications
- Extruder screws and barrels
- Gears and gear shafts
- Crank and camshafts
- Mold pins, slides, ejectors
- Hydraulic pump parts
03Delivery Condition
- Quenched and tempered (+QT, 30–36 HRC) or annealed (max. 248 HB); peeled bar.
04Heat Treatment
Typical values
- Soft annealing
- 680–720 °C; max. 248 HB
- Quench and temper
- 870–930 °C oil + temper 580–700 °C
- After QT
- Rm ≈ 1000–1200 MPa; 30–36 HRC
- Nitriding
- 500–530 °C, 30–90 h (gas) or plasma
- Nitrided surface hardness
- 800–950 HV
- Case depth
- 0.3–0.7 mm typical
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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