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CNP arm for welding tong
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CNP arm for welding tong
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CNP arm for welding tong
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Material designation SCHMELZMETALL
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HOVADUR® CNP
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Material designation, EN standard
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CuNi1P
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Material No., EN standard
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CW108C
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Material No., former DIN standard
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not standardized
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Material No., UNS system (ASTM)
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C19000
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Classification RWMA (USA)
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Class 4
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Information about standards
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EN
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EN12163 (Round bars)
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DIN (former)
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The material was not included in former DIN standards.
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ASTM
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This alloy is defined as C19000. but not included in any standard.
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Description of material
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HOVADUR® CNP is a precipitation hardenable copper alloy. In hardened condition, the alloy has a specific combination of good mechanical strength and excellent ductility as well as high electrical conductivity. Therefore, it is especially suited for numerous applications in electrical engineering. The alloy is characterized by good fatigue and annealing properties.
The most important practical characteristic is its good cold bending property in hardened condition at acceptable
hardness.
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Material properties
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Chemical composition in % of weight (guaranteed ranges)
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Ni
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P
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others total
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Cu
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0.8-1.2
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0.15-0.25
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max. 0.1
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Remainder
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Agreed properties at 20 °C (Condition: hardened)
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Condition
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Cold formed, hardened
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Hollow bars (Tubes)
Outer-Ø: 30–50 mm
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Hollow bars (Tubes)
Outer-Ø: > 50–60 mm
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Hardness Brinell HB
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min. 150
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min. 140
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Electrical conductivity
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MS/m
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min. 32
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(min. 55% IACS)
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| *) In case of different opinions, hardness is calculated as the average of 3 randomly located measurings. |
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Associated properties at 20 °C (Condition: hardened)
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Tensile strength
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1)
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N/mm² (MPa)
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min. 450
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max. 400
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0,2% yield strength
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1)
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N/mm² (MPa)
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min. 400
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max. 360
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Elongation (A5)
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1)
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%
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min. 20
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min. 20
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1) Strength values will only be proved if ordered by the customer.
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Material information (nominal values)
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Elastic modulus
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N/mm² (MPa)
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140,000
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Softening temperature
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°C
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450
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Specific weight
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g/cm³
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8.9
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Thermal conductivity
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W/mK
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245
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(Average 20 °C-300 °C)
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Thermal expansion coefficient
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x 10-6/°K
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17.0
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(Average 20 °C-300 °C)
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Melting interval
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°C
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1038-1087
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Processing instructions
Hot forming
HOHOVADUR® CNP is suitable for hot forming at temperatures of about 900–700 °C. After forming, quick cooling in water is recommended.
Advice: After a hot forming executed by the customer, the properties of HOVADUR® CNP will normally no longer
be achieved.
Cold forming
Even in condition “cold formed, hardened”, HOVADUR® CNP is well suited for cold forming. Hollow bars (tubes) can be cold bended without any problems when using bending machines with according strength.
In case of other and more important cold formings, HOVADUR® CNP in solution heat treated condition has to be used.
After forming, as a rule, the part has to be heat treated.
Heat treatment
A heat treatment changes the agreed properties. If a heat treatment is executed after supply of the material by SCHMELZMETALL, we cannot guarantee any properties.
Advice for heat treatments (they always depend to a large degree on the kind and the function of the furnace)
Solution heat treatment: 760–820 °C, about 30 minutes followed by quenching in water
Hardening: 420–480 °C, 2–5 h followed by cooling at the air
Machining
In condition “cold formed and hardened” (condition in which the material is supplied by SCHMELZMETALL), machining (e. g. turning, milling, drilling) is possible without any problems. Same tools with same machining data as for alloy CuCr1Zr (HOVADUR® CCZ) can be used. As a matter of principle, hard metal tools combined with cooling with emulsion are recommended.
Joining
In metallic brillant condition, HOVADUR® CNP is suited for soft soldering. Attention must be paid to limiting the temperature to max. 450 °C. Hard soldering with very low melting silver brazing is possible, too. But even if soldering times are limited, a loss in hardness has to be expected. This has to be evaluated as the case arises. HOVADUR® CNP hollow bars (tubes) may be reinforced by welding of ribs/webs which does not change the properties of the material.
They remain the same as before welding (see SCHMELZMETALL – data sheet).
Application examples
Holders, shafts for spot and seam welding of mostly plain steel. Arms and bended arms for spot welding tongs with internal cooling.
Documents:
| Details of the properties or application of materials are for descriptive purposes only. Confirmation of suitability with regard to specific properties or application require written agreement. |
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Material data sheet