Skip to content
Move Metal
tr|en

34CrMo4 (4135) Engineering Steel

1.7220

  • EN1.7220
  • EN34CrMo4
  • AISI4135
  • UNSG41350

Chromium-molybdenum quenched and tempered steel between 42CrMo4 and 25CrMo4. Used for shafts, bolts and pressure parts requiring medium to high strength with good toughness and weldability.

Request 34CrMo4 QuotationWeight Calculator

01Material Properties

  • Rm 800–1000 MPa (+QT)
  • Good toughness
  • Better weldability than 42CrMo4
  • Medium hardenability
  • Suitable for nitriding

02Applications

  • Shafts and axles
  • Bolts and studs (8.8 / 10.9)
  • Pressure vessel and gas cylinder steel
  • Cranks and gears
  • Hydraulic components

03Delivery Condition

  • Quenched and tempered (+QT) or annealed (max. 223 HB).

04Heat Treatment

Typical values

Soft annealing
680–720 °C; max. 223 HB
Normalising
835–875 °C, air
Hardening
840–870 °C; oil
Tempering (QT)
540–660 °C, 1–2 h
After QT (+QT)
Rm 800–1000 MPa, Rp0.2 ≥ 550 MPa (≤ 100 mm)
Surface hardening
Induction / flame; nitriding possible

Heat treatment cycle (schematic)

02004006008001000Austenitise855°1. Austenitise — 855 °C2. Quench — 60 °CTemper600°3. Temper — 600 °C4. Cool — 25 °CTime (schematic, not to scale)°C
Stages and temperatures are typical values; soaking times depend on section size.

Tempering diagram (approximate)

203040506001002003004005006007000 °C → 53 HRC200 °C → 50 HRC300 °C → 47 HRC400 °C → 43 HRC500 °C → 38 HRC550 °C → 34 HRC600 °C → 31 HRC650 °C → 27 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.

Have a material requirement?

Send us your specification, drawing or RFQ. Our team will review the requirement and identify a suitable supply option.

Request 34CrMo4 QuotationSell Your Scrap
Request a Quote