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20MnCr5 Case-Hardening Steel

1.7147

  • EN1.7147
  • EN20MnCr5
  • AISI5120

Case-hardening steel with higher carbon and manganese than 16MnCr5, giving higher core strength and hardenability. Used for medium-section gears and driveline components.

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01Material Properties

  • Surface 58–62 HRC, core Rm 1000–1300 MPa
  • Medium hardenability; section ≤ 60 mm
  • Good wear resistance
  • Good machinability
  • Automotive gear standard

02Applications

  • Gears and gear shafts
  • Driveline and differential parts
  • Cams and camshafts
  • Pins and bushings
  • Bearing rings

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
820–860 °C, oil
Tempering
150–210 °C, 1–2 h
Surface hardness
58–62 HRC
Core
Rm ≈ 1000–1300 MPa

Heat treatment cycle (schematic)

02004006008001000Carburise920°1. Carburise — 920 °C2. Cool — 25 °CAustenitise840°3. Austenitise — 840 °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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