42CRMO4

42CrMo4 Alloy Steel Product Overview

42CrMo4, also known as AISI 4140, SAE 4140, or EN 1.7225 under the EN 10083-3 standard, is a low-alloy, chromium-molybdenum steel renowned for its high strength, toughness, and excellent fatigue resistance. This versatile steel is widely used in applications requiring high tensile strength and good wear resistance. Typically supplied in the annealed condition (max 229 HB) or hardened and tempered (28–36 HRC), 42CrMo4 offers good machinability, weldability, and impact resistance, making it suitable for heavy-duty engineering components subjected to dynamic loads.

Applications

42CrMo4 is used in a wide range of industries for components requiring high strength, toughness, and durability:

Engineering Components:

• Gears, pinions, and sprockets for automotive and industrial machinery.
• Crankshafts, axles, and connecting rods.
• High-strength bolts, studs, and fasteners.

Oil and Gas:

• Drill collars, pump shafts, and fittings for high-pressure environments.
• Components for pipelines and exploration equipment.

Automotive and Aerospace:

• Chassis components, suspension parts, and drive shafts.
• Aircraft landing gear and structural parts.

Other Uses:

• Tool holders, die holders, and forging dies.
• Heavy-duty machinery parts in construction and mining, such as spindles and couplings.
• High-load structural components in power generation.

Chemical Composition

The chemical composition of 42CrMo4 ensures its strength, toughness, and hardenability:

• Chromium (Cr): Enhances hardenability, wear resistance, and corrosion resistance.
• Molybdenum (Mo): Improves strength, toughness, and resistance to tempering.
• Manganese (Mn): Contributes to hardenability and tensile strength.
• Carbon (C): Provides hardness while maintaining ductility.

Supply Size

42CrMo4 is available in various forms and sizes to meet industrial requirements:

• Round Bars:
  Diameter 16 mm to 700 mm.
• Flat Bars:
  Minimum: 10 mm thickness x 80 mm width.
  Maximum: 500 mm thickness x 2000 mm width.