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54SiCr6 Spring Steel

1.7102

  • EN1.7102
  • EN54SiCr6
  • AISI~9254

Silicon-chromium spring steel. High elastic limit and relaxation resistance; used for valve springs and highly stressed coil springs.

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01Material Properties

  • Spring hardness 48–54 HRC (1500–1900 MPa)
  • High relaxation resistance
  • Good fatigue strength
  • Sensitive to decarburisation; protective atmosphere
  • As wire and bar

02Applications

  • Valve springs
  • Highly stressed coil springs
  • Suspension springs
  • Clutch springs
  • Spring washers

03Delivery Condition

  • Soft annealed or quenched and tempered; wire, round bar.

04Heat Treatment

Typical values

Soft annealing
680–720 °C; max. 248 HB
Hardening
840–880 °C; oil
Tempering
380–480 °C, 1–2 h
Spring hardness
44–52 HRC (1300–1700 MPa)
Note
Decarburisation reduces fatigue life; protective atmosphere

Heat treatment cycle (schematic)

02004006008001000Austenitise860°1. Austenitise — 860 °C2. Quench — 60 °CTemper430°3. Temper — 430 °C4. Cool — 25 °CTime (schematic, not to scale)°C
Stages and temperatures are typical values; soaking times depend on section size.

Tempering diagram (approximate)

304050607001002003004005006007000 °C → 63 HRC200 °C → 60 HRC300 °C → 57 HRC400 °C → 53 HRC450 °C → 51 HRC500 °C → 47 HRC550 °C → 42 HRCTempering temperature (°C)Hardness (HRC)
Approximate hardness versus tempering temperature after hardening from the typical austenitising temperature.

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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