42CRMO4

42CRMO4 Grade Introduction:

42CrMo4 Alloy Steel – SAE-AISI 4140 is classified as low alloy steel. Medium carbon steels are high-strength steels that include EN19 as an important member in the low alloy category. These steels show a positive response to a variety of heat treatments. 42CrMo4 is a 1% chromium – molybdenum medium hardenability general purpose high tensile steel – generally supplied hardened and tempered in the tensile range of 850 –1000 Mpa (condition T). 42CrMo4 Alloy steel is a high quality, high tensile alloy steel usually supplied readily machinable in ' T' condition, giving good ductility and shock resisting properties combined with resistance to wear. We specialize in the supply of EN19, 4140, 42CrMo4 Hot Rolled Steel Round Bars.

42CRMO4 Grade Application:

  • Making various kinds of machinery
  • Automobile parts
  • Mining spare parts
  • Gearwheels for engines
  • Driving gears for superchargers
  • Connecting rods
  • Pin chocks under high pressure
  • Shafts
  • Gears

42CRMO4 Equivalent Grades:

Standard AISI 4140 SAE 4140 42CrMo4 42CrMoS4 DIN 1.7225

42CRMO4 Chemical Composition:

Element C Si Mn P S Cr Mo
Content (%) 0.38-0.45 0.40 max 0.60-0.90 0.035 max 0.035 max 0.90-1.20 0.15-0.30

Mechanical Properties:

Size Ø mm Yield Stress Rp0.2 (N/mm², min) Ultimate Tensile Stress Rm (N/mm²) Elongation A5 (%) min Hardness HB Toughness KV (Joule, min.)
< 40 750 1000-1200 11 295-355 35 at 20 °C
40-95 650 900-1100 12 265-325 35 at 20 °C
> 95 550 800-950 13 235-295 35 at 20 °C

Physical Properties:

Quantity Value Unit
Thermal expansion 10 – 10 e-6/K
Thermal conductivity 25 – 25 W/m.K
Specific heat 460 – 460 J/kg.K
Melting temperature 1450 – 1450 °C
Density 7700 – 7700 kg/m³
Resistivity 0.55 – 0.55 Ohm.mm²/m

Thermal Properties:

Property Value Unit
Thermal conductivity 0.42 kW/(cm*K)

Forging Properties:

42CrMo4 is forged at 926 to 1205°C.

Stress Relieving:

450-650°C

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