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42CrMo4

42CrMo4 is a chromium-molybdenum (Cr-Mo) alloyed steel with high mechanical strength, mainly used after quenching heat treatment (quenching + tempering).

Chemical composition

42CrMo4 / 42CrMoS4

ISO Standard

1.7225 / 1.7227

The 42CrMo4 is a chromium-molybdenum (Cr-Mo) alloyed steel with high mechanical strength, mainly used after heat treatment (quenching + tempering). It is suitable for components subject to high stress, torsion, impact and mechanical fatigue.

It is suitable for processing in precision metal parts in the ranges Ø 3-32 mm e length up to 250 mm.

Why use 42CrMo4 - hardened and tempered alloy steel?

1
High mechanical strength and hardness
- Tensile strength up to 1000-1100 MPa after reclamation
- High toughness even at high thicknesses
- Excellent fatigue and impact resistance
- Suitable for dynamically loaded components
2
Good hot performance
- Stable up to 300-400°C
- Used for shafts, gears, transmission parts under stress
3
Good workability
- Good workability in the annealed state
- Maintains high dimensional accuracy after reclamation
4
Possibility of heat and surface treatments
- Quenching (hardening + tempering)
- Nitriding or case hardening to improve surface hardness
- Chrome or nickel plating to increase wear and corrosion resistance

Typical applications of 42CrMo4 - hardened and tempered alloy steel

Automotive Sector

- Drive shafts, axle shafts, pivots, components subject to fatigue
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General mechanics

- Gears, shafts, hubs, bushings
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Hydraulics and pneumatics

- Pistons, valve bodies, cylinder heads, rods
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Heavy industry

- Parts subject to impact or torsion
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Security

- Components for locks and locking devices
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When to avoid 42CrMo4 - hardened and tempered alloy steel?

When required corrosion resistance (not stainless steel).

For applications food or medical.

In environments aggressive marine or chemical without protective treatments.

If you request high weldability (the alloy has limited solderability).

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