34CrAlNi7 Nitriding Steel
1.8550
- EN1.8550
- EN34CrAlNi7
- DIN34CrAlNi7-10
Aluminium-alloyed nitriding steel. Gives the highest surface hardness after nitriding (950–1100 HV); nickel content increases core toughness. Used for parts requiring maximum wear resistance and dimensional stability.
01Material Properties
- Surface 950–1100 HV after nitriding
- Tough core (Ni)
- Very low distortion
- Excellent wear resistance
- Nitrided layer is brittle; avoid sharp edges
02Applications
- Extruder screws and barrels
- Measuring tools and gauges
- Mold pins and guide elements
- Pump shafts and pistons
- Plain bearing parts
03Delivery Condition
- Quenched and tempered (+QT) or annealed (max. 248 HB).
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
- 950–1100 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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