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39NiCrMo3

39NiCrMo3 is a nickel-chromium-molybdenum alloy steel highly valued for its high mechanical performance after heat treatment.

Chemical composition

39NiCrMo3 / 39NiCrMo3Pb

ISO Standard

1.6510 / 1.6510 + Pb

The 39NiCrMo3 is an alloy steel nickel-chromium-molybdenum highly valued for its high mechanical performance after heat treatment. It is suitable for components highly stressedwhere they are needed high tenacity, fatigue resistance e dimensional stability.

It is suitable for precision mechanical small parts with diameters 3 to 32 mm and lengths up to 250 mm.

Why use 39NiCrMo3 - nickel-chromium-molybdenum alloy steel

1
Very high mechanical strength and toughness
- Excellent characteristics after quenching and tempering
- Tensile strength also over 1100-1300 MPa
- Excellent resistance to fatigue and dynamic shocks
- Good resilience even at low temperatures
2
Dimensional stability and hardness
- Lends itself very well to grinding and precision machining
- Excellent response to surface treatments (nitriding, chrome plating)
3
Excellent aptitude for heat treatments
- It hardens easily and retains its properties even on thick sections
- It can be nitrided to improve surface hardness without losing internal toughness
4
Good workability in the annealed state
- Enables precise processing before final reclamation

Typical applications of 39NiCrMo3 - nickel-chromium-molybdenum alloy steel

Automotive and motorsport

- camshafts, crankshafts, transmission parts
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Hydraulics and heavy mechanics

- rods, valve bodies, cylinders, gear wheels
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Precision Mechanics

- pins, bushings, high-stress shafts
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Energy and railway industry

- components subjected to cyclic fatigue
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Safety and locking mechanisms

- pins, keys, levers
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When to avoid 39NiCrMo3 - nickel-chromium-molybdenum alloy steel?

Where it is required corrosion resistance high (non-stainless)

In food or medical environments (not certified for direct contact)

Where frequent welding is needed (has limited weldability)

If heat treatment is to be avoided (requires reclamation to be at its best)

39NiCrMo3Pb - Leaded version of 39NiCrMo3

Why use the leaded version?

1
Improved machinability on the lathe
- The addition of lead (Pb 0.15-0.35%) considerably improves machinability
- Reduces tool wear and cycle times
- Cleaner machining surface, ideal for high production turned parts
2
Retains most of its mechanical properties
- Although the addition of Pb may slightly reduce toughness, tensile strength and hardness remain very good
- Still allows treatments such as hardening, quenching, nitriding
3
Ideal for automatic and CNC machining
- More suitable than the standard version for large batches of small mechanical parts

When to avoid 39NiCrMo3 - nickel-chromium-molybdenum alloy steel?

Not suitable for deep heat treatments on large sections (Pb can segregate itself)

Poor weldability

Not suitable for regulated sectors such as food, medical, drinking water

Environmental standards (RoHS, REACH) limit or prohibit it in certain areas

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