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420C Stainless Steel

1.4034

  • EN1.4034
  • ENX46Cr13
  • AISI420C

Martensitic stainless steel with higher carbon content than 1.4021. Provides higher hardness and wear resistance; used where cutting edges and dimensional stability are required.

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01Material Properties

  • Hardenable to 54–57 HRC
  • Good wear resistance and edge retention
  • Moderate corrosion resistance
  • Magnetic
  • Polishable

02Applications

  • Knives, cutting tools and surgical instruments
  • Mold components for corrosive plastics
  • Measuring tools and gauges
  • Pump shafts and valve needles
  • Bearing balls and seats

03Delivery Condition

  • Max. 245 HB, annealed.

04Heat Treatment

Typical values

Soft annealing
750–800 °C; max. 245 HB
Preheating
760–800 °C
Hardening
1000–1050 °C; oil/air
As-quenched hardness
≈ 55–57 HRC
Tempering
100–250 °C → 53–56 HRC; avoid 400–550 °C
Working hardness
52–56 HRC

Heat treatment cycle (schematic)

020040060080010001200Preheat780°1. Preheat — 780 °CAustenitise1025°2. Austenitise — 1025 °C3. Quench — 60 °CTemper175°4. Temper — 175 °C5. Cool — 25 °CTemper175°6. Temper — 175 °C7. 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 → 57 HRC100 °C → 56 HRC200 °C → 55 HRC300 °C → 53 HRC400 °C → 52 HRC500 °C → 52 HRC550 °C → 48 HRC600 °C → 40 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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