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15CrNi6 Case-Hardening Steel

1.5919

  • EN1.5919
  • EN15CrNi6
  • DIN15CrNi6

Chromium-nickel case-hardening steel. Offers high core toughness and good hardenability; used for gears and shafts subject to impact loading.

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01Material Properties

  • Core Rm 900–1200 MPa
  • High toughness (Ni)
  • Good hardenability
  • Surface 58–62 HRC
  • Good machinability

02Applications

  • Impact-loaded gears
  • Truck and construction machinery driveline parts
  • Shafts and axles
  • Pins and bushings
  • Aircraft ground equipment

03Delivery Condition

  • Soft annealed (max. 217 HB) or +FP.

04Heat Treatment

Typical values

Soft annealing
650–700 °C; max. 217 HB
Carburising
870–970 °C; 0.5–2 mm case depth
Hardening
810–850 °C, oil
Tempering
150–210 °C, 1–2 h
Surface hardness
58–62 HRC
Core
Rm ≈ 900–1200 MPa

Heat treatment cycle (schematic)

02004006008001000Carburise920°1. Carburise — 920 °C2. Cool — 25 °CAustenitise830°3. Austenitise — 830 °C4. Quench — 60 °CTemper180°5. Temper — 180 °C6. Cool — 25 °CTime (schematic, not to scale)°C
Stages and temperatures are typical values; soaking times depend on section size.

Tempering diagram (approximate)

5060700100200300400500600700150 °C → 62 HRC200 °C → 60 HRC250 °C → 58 HRC300 °C → 56 HRC62 HRCTempering temperature (°C)Hardness (HRC)
Surface hardness after carburising versus tempering temperature (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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