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PR70

PR70 (36SMn14) is an excellent lead-free alternative to PR80 (36SMnPb14), combining good processability, high mechanical strength and environmental compatibility.

Chemical composition

36SMn14

ISO Standard

1.0764

The PR70also known as 36SMn14, is a manganese-sulphur alloyed automatic steelcharacterised by excellent workability e good mechanical properties. It is the version lead-free of PR80 (36SMnPb14)therefore maintains the same mechanical performance but is more environmentally friendly and complies with environmental regulations (ROHS and REACH).

Thanks to the good mechanical strength and the possibility of heat treatmentis ideal for the production of precision mechanical small parts with diameters between 3 and 32 mm and lengths up to 250 mmas in your production.

Why use PR70 (36SMn14)?

1
Good workability
- The content of sulphur (S) improves machinability, although less than the lead version (PR80).
- Suitable for high speeds on CNC and automatic lathes.
- Good surface finish, but may require minor adjustments compared to leaded steels.
2
High mechanical strength
- It withstands stress better than softer automatic steels such as AVZ (11SMn37).
- Suitable for components subject to dynamic loads and vibrations.
3
Good response to heat treatments
- It can be hardening-returned to improve hardness and wear resistance.
- Cementable to achieve a harder surface while maintaining internal toughness.
4
Environmentally friendly alternative to PR80 (lead-free)
- Compliant with restrictions environmental and health (ROHS, REACH).
- Suitable for applications in sectors where lead is banned (food, medical, plumbing).

Applications of small parts in PR70 (36SMn14)

Mechanical and Automotive

- Pins, bushings, screws and shafts.
- Components for transmissions and gearboxes.
- Structural elements for mechanisms subject to wear and tear.
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Hydraulics and Pneumatics

- Plungers, fittings, valves subject to pressure.
- Components for hydraulic and fluid handling systems.
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Industrial Machinery Sector

- Parts of actuators and mechanical guides.
- Axles and pivots of machinery.
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Electromechanical Sector

- Components for gearboxes, motors and transmission systems.
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When to avoid PR70 (36SMn14)?

If very high workability is required → The absence of lead makes it less machinable than PR80 (36SMnPb14).

If high corrosion resistance is required → Not stainless, so for wet or aggressive environments better AISI 303, 304 or 316.

If optimal weldability is required → The presence of sulphur reduces the quality of the weld.

If you need a cheaper steel for general applications → In that case, theAVZ (11SMn37) may be a more convenient choice.

The PR70 (36SMn14) is an excellent alternative lead-free at PR80 (36SMnPb14), combining good workability, high mechanical strength and environmental compatibility. It is ideal for precision mechanical small parts high-strengthespecially in lead-restricted sectors such as plumbing, food and medical. However, if the maximum workability is an essential requirement, the PR80 remains superior.

PR70 (36SMn14) with galvanising treatment

The PR70 (36SMn14) is a lead-free automatic steel, known for its good workability and superior mechanical strength compared to AVP and AVZ. Being lead-free, it is a more environmentally friendly choice than the PR80 (36SMnPb14) and compliant with environmental regulations ROHS and REACH.

Thanks to its content of sulphur (S) and manganese (Mn), guarantees excellent machinability and good hardnessmaking it suitable for components subject to mechanical stress. However, corrosion resistance is limited, so it is often galvanised to improve its durability and protect it from oxidation and rust

Why use galvanised PR70?

1
Good workability and precision
- Easy to machine on CNC and automatic lathes at high speed.
- Excellent surface finish → Ideal for precision small parts.
- Environmentally friendly alternative to PR80 → Lead-free, compliant with ROHS and REACH.
2
Higher mechanical strength than AVZ
- Stronger and tougher than AVP and AVZsuitable for components subject to stress.
- Good fatigue and wear resistanceideal for moving parts.
3
Corrosion protection through galvanisation
- The galvanising provides a protective barrier against oxidation and rusting.
- Longer duration in humid environments or exposed to the weather.
4
Cheaper alternative to stainless steels
- Cheaper than AISI 303, 304 and 316with a fair degree of corrosion protection.

Applications of galvanised PR70 hardware

Mechanical and Automotive

- Pins, spacers, shafts and structural screws.
- Transmission components and mechanical supports.
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Hydraulics and Pneumatics

- Fittings, nipples and valves for hydraulic and pneumatic systems.
- Components for hydraulic pumps and cylinders.
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Furnishing and Carpentry Sector

- Brackets, supports and hardware for metal structures.
- Structural components with good mechanical strength.
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Electromechanical and Industrial

- Pins and spacers for industrial machinery.
- Fasteners for electrical panels and metal structures.
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When to avoid galvanised PR70?

If high corrosion resistance is required → Galvanising helps, but for aggressive environments it is better to use AISI 304 or 316.

If you work in environments with lead restrictions → Although lead-free, zinc plating may not be accepted in some medical or food sectors.

If good weldability is required → Sulphur content worsens weldability.

If the part has to withstand extreme loads → In this case, a stronger alloy steel is better.

The PR70 galvanised is an excellent choice for small mechanical parts thanks to the good workability, high mechanical strength and corrosion protection. It is particularly suitable for automotive, hydraulics, pneumatics and carpentrybut it is not the best solution for highly corrosive environments or frequent welding.

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