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Forged round bars
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Forged plate
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Machined round bars
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Material designation SCHMELZMETALL
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HOVADUR® CNCS
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Material designation, EN standard
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not standardized (similar to CuNi2Si/CuNi3Si)
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Material No., EN standard
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not standardized (similar to CW111C/CW112C)
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Material No., former DIN standard
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not standardized (similar to 2.0855/2.0857)
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Material No., UNS system (ASTM)
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C18000
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Information about standards
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EN
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not standardized
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DIN (former)
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(DIN17666/DIN17672, for similar alloys CuNi2Si/CuNi3Si)
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ASTM
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not standardized
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Description of material
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HOVADUR® CNCS is a thermally precipitation hardenable copper-nickel-silicium alloy with addition of chromium. The
material shows high electrical and thermal conductivity as well as great hardness and strength. These properties are
combined with good resistance to corrosion and abrasion. Furthermore, the alloy is excellent for cold and hot forming.
HOVADUR® CNCS is applied in many cases which require a Be-free alloy.
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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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Si
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Cr
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Fe
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Mn
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Pb
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others total
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Cu
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2.0-3.0
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0.5-0.8
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0.2-0.5
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max. 0.15
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max. 0.1
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max. 0.02
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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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Hardness Brinell HB
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min. 190 *)
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Electrical conductivity
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MS/m
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min. 22
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(min. 38% 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. 650
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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. 500
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Elongation (A5)
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1)
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%
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min. 10
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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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480
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Specific weight
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g/cm³
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8.84
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Thermal conductivity
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W/mK
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220 (190-240)
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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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16.2
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(Average 20 °C-300 °C)
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Melting interval
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°C
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1060-1085
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Processing instructions
Hot forming
HOVADUR® CNCS is very well 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® CNCS will normally no
longer be achieved.
Cold forming
HOVADUR® CNCS in hardened condition is not intended for cold forming, at least only to a very limited extent. In case,
a cold forming has to be executed, HOVADUR® CNCS 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: 910–970 °C, about 30 minutes followed by quenching in water
Hardening: 460–500 °C, 2–5 h followed by cooling at the air
Machining
HOVADUR® CNCS is well suitable for machining. We recommend standard hard metal tools and cooling with emulsion.
HOVADUR® CNCS is suited for eroding. But due to its relatively high electrical conductivity, conditions are more difficult.
No special measures are necessary for grinding and polishing. Surface may be coated according to all usual procedures.
Joining
HOVADUR® CNCS is suited for soldering. Concerning hard soldering, a loss in hardness is to be expected. A very low
melting silver brazing should be used.
HOVADUR® CNCS is very well suited for joining by welding. Build-up welding by MIG/MAG arc welding as well as TIG
welding is very suitable, too.
Application examples
Die casting pistons in cold chamber die casting machines, cooling inserts in moulds, moulds for non-ferrous metal
casting (e. g. low pressure casting).
Hot-pressed parts for electrical engineering, fittings, braces and fixing elements for high strain, especially for aerial wire
and marine applications.
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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Product data sheet