Sprayforming - LV7
(Extra hard Nickel-Manganese-Copper, alternative to e.g. Beryllium copper)
Type of material:
Nickel-Manganese-Copper (high tensile copper)
Chemical composition (Nom.)
- Cu Rest.
- Ni 20,0 %
- Mn 20,0 %
- Impurities
Others max : 0,5 %
Mechanical properties(nom.)
Yield strength (Rp N/mm2 ):
Tensile strength (Rm N/mm2):
Elogation in % A 5:
Hardness/Vickers:
Soft
> 180 N/mm2
> 450 N/mm2
35 %
120 HV
30 %
cold working
> 650 N/mm2
> 750 N/mm2
5 %
240 HV
30% cold working / tempering
> 950 N/mm2
> 1100 N/mm2
> 1 %
> 320 HV
Density ~ 8,2 g/cm3
Mating material: Min. surface hardness >250-450 HB Rec. surface roughness < 1 Ra.
Machineability: 40 /100 (Index, free cutting brass, CuZn39Pb3 100 /100)
Physical properties
Electr. conductivity, MS/m: 1,3
% IACS: 2
Thermal conductivity, W/moK: 10
Modulus of elasticity, kN/mm2: 125
| Other properties |
Good |
Medium |
Poor |
| Workability |
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| Workability, cold |
x |
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| Workability, warm |
x |
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| Welding, brazing and soldering |
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| Resistance-welding |
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x |
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| Brazing |
x |
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| Soldering |
x |
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| Surface treatment |
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| Mechanical surface treatment |
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| Electrolytical surface treatment |
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| Electroplating |
x |
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Material description
For a number of applications, such as drilling components for oil exploration, antimagnetic copper base alloys with very high strength and low galling tendency are required.
The alloy-family, CuMnNi, basically has the potential to meet these requirements.
However, also in this case, production with conventional casting methods is very difficult due to the high alloy contents. The material LV7 , CuMn20Ni20, is an agehardenable alloy, which enables it to fulfil the requirements of high strength. The corrosion resistance of Sprayformed alloy LV7 is as good as that of leadfree Nickel-Silver alloys.
LV7 is able to compete with heat treated steels and Beryllium-copper
Areas of use
A material for the tough and rough use. Can replace Beryllium-Copper in comparison with hardness, but not in thermal- or electrical conductivity. Excellent wearability, reistance and insensitive to shock-stress and abrasion.