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42CrMo4 1.7225 Alloy Steel

Category : Special Steel

Size :

Diameter :80 to 600 mm

Length : 1000 to 9000 mm

Applications : forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.

  • Description
  • Specification
  • Standard
  • Process
  • Packing

42CrMo4 steel is a low alloy steel containing chromium, molybdenum, and manganese. It is widely used across numerous industries and is an excellent material choice due to its toughness, high fatigue strength, and abrasion and impact resistance. Not many grades can match the versatility and usefulness。

Chemical Properties 

C

Cr

Mn

Si

Mo

S

P

0.38-.43%

0.80-1.10%

0.75-1.0%

0.15-0.30%

0.15-0.25%

0-0.040%

0-0.035%

 

Mechanical Properties 

Properties

Metric

Imperial

Tensile strength

655 MPa

95000 psi

Yield strength

415 MPa

60200 psi

Bulk modulus (typical for steel)

140 GPa

20300 ksi

Shear modulus (typical for steel)

80 GPa

11600 ksi

Elastic modulus

190-210 GPa

27557-30458 ksi

Poisson’s ratio

0.27-0.30

0.27-0.30

Elongation at break (in 50 mm)

25.70%

25.70%

Hardness, Brinell

197

197

Hardness, Knoop (converted from Brinell hardness)

219

219

Hardness, Rockwell B (converted from Brinell hardness)

92

92

Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)

13

13

Hardness, Vickers (converted from Brinell hardness)

207

207

Machinability (based on AISI 1212 as 100 machinability)

65

65

Heat Treatment  

42CrMo4 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling.


Forging

42CrMo4 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)


Hot Working 

42CrMo4 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)


Cold Working  

42CrMo4 alloy steel can be cold worked using conventional methods in the annealed condition.


Annealing 

42CrMo4 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.


Tempering  

42CrMo4 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has a lower tempering temperature. For example, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).


Hardening  

42CrMo4 alloy steel can be hardened by cold working, or heating and quenching.


Machinability  

42CrMo4 alloy steel has good machinability in the annealed condition.

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