42CrMo4, 1.7225, 708M40 AISI 4140, 42CD4, 40ChML, Alloy Engineering Steel – Chemical composition, equivalent, properties | Alok India

1.7225 Alloy Special Steel

Everything You Need to Know About 42CrMo4, 708M40, 709M40, 42CD4, 4140H, 4140, 40ChML, 1.7225 Alloy Steel EN 1003-3 2006


1.7225 Alloy Steel Description

1.7225 alloy steel is classified as structural steel.  The 42CrMo4 alloy steel is strong and hardenable and is used for heavily loaded medium. The 40 ChML steel is used for large parts with strength requirements exceeding the capabilities of several other steel grades. The 1.7225 alloy steel is a good alternative to chrome-nickel and chrome-nickel-molybdenum steels that are expensive.


1.7225 Alloy Steel Applications 

The 1.7225 alloy steel has a good set of properties that makes it a suitable material to create various products and parts. It can be used in various applications. This includes:

  1. Axles
  2. Chain wheels
  3. Motor cylinders
  4. Connecting rods
  5. Chain wheels
  6. Motor cylinders
  7. Multi-spline shafts
  8. Ball pins
  9. Crankshafts
  10. Shafts


1.7225 Alloy Steel Chemical Composition

The chemical composition of 1.7225 alloy steel is:

1.7225 steel chemical element % present
Carbon (C)  0.38 to 0.45%
Manganese (Mn)  0.60 to 0.90%
Silicon (Si) [Max] 0.40%
Chromium (Cr) [Max] 0.90 1.20%
Phosphorus (P) [Max] 0.025%
Sulphur (S) [Max] 0.035%
Molybdenum (Mo)  0.15 to 0.30%


1.7225 Alloy Steel Heat Treatment

1.7225 steel hot work and heat treatment temperature
Tempering °C Quenching °C
540 to 680 820 to 800
Oil or polymer


1.7225 Alloy Steel Properties

Here are the properties of 1.7225 alloy steel:

  1. Can be annealed
  2. Welding not recommended


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