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CuNi2SiCr

  • ENCW111C
  • DIN2.0855
  • UNSC18000
  • RWMAClass III

Beryllium-free copper-nickel-silicon-chromium age-hardening alloy offering good conductivity and high strength. An alternative to beryllium alloys for welding electrodes and mold components.

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01Applications

  • Spot welding electrodes
  • Seam welding wheels
  • Projection and butt welding electrodes
  • Welding of stainless steel
  • Permanent molds for brass and bronze casting
  • Plastic injection mold components
  • Plungers for aluminium die casting machines
  • Electrode holders and seam welding shafts

02Heat Treatment

Typical values

Solution treatment
900–950 °C; water quench
Ageing
450–500 °C, 2–4 h
After ageing
≈ 180–230 HB
Electrical conductivity
≈ 40–45 % IACS
Delivery condition
Solution treated + aged

Heat treatment cycle (schematic)

02004006008001000Solution treat925°1. Solution treat — 925 °C2. Quench — 25 °CAge475°3. Age — 475 °C4. Cool — 25 °CTime (schematic, not to scale)°C
Stages and temperatures are typical values; soaking times depend on section size.

Ageing diagram (approximate)

5010015020025001002003004005006007000 °C → 90 HB400 °C → 175 HB450 °C → 210 HB475 °C → 220 HB500 °C → 215 HB550 °C → 190 HB600 °C → 150 HB220 HBAgeing temperature (°C)Hardness (HB)
Approximate hardness versus ageing temperature after solution treatment (0 °C = solution-treated condition).

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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