All Silmet copper tubes in Level Wound Coils for industrial use and ACR are produced in compliance with international standards and with the specific requirements of customers. Particular attention is paid to dimensional uniformity, uniformity of the physical state, the absence of faults and internal cleanliness of the copper tubes.
The length, weight, number of faults present, dimensions and all references aimed at guaranteeing the traceability of the product with regard to laboratory tests carried out in compliance with stringent sampling and control plans implemented during production, are highlighted for each individual coil.
The internal cleanliness of the copper tubes is considerably above the limit of 0.038 g/m2.
The Silmet Quality System is certified in compliance with the ISO 9001:2015 standard; the Quality Service is assigned to highly qualified, constantly updated personnel whose functions are independent from production departments; they use the most sophisticated laboratory and production control equipment
All phases of the production process, starting from acceptance of raw materials, are subject to very severe sampling and control plans aimed at guaranteeing that the end products achieve very high quality standards.
Silmet has always been aware of the needs of the market and is constantly up-to-date technologically.
With all these things in mind, in order to help its customers with the growing trend in production automation and to be able to satisfy their requirements, Silmet is equipped with cutting-edge LWC copper tube production plants.
Silmet S.p.A. has been manufacturing copper tubes for usage in plumbing, heating, sanitary and industrial applications since 1973. Over recent years, thanks to its excellent conductivity, machinability, resistance to corrosion and user-friendliness, the copper tube has made a name for itself as the ideal product for air-conditioning/refrigeration equipment, for the heating industry and for the production of heat exchangers.
|Crystalline structure||cubic with faces centred with the side of the cube 3.6078 Å|
|Smelting temperature||1083° C|
|Boiling temperature||2595° C|
|Volumic mass (density) at 20° C||8,94 g/cm3|
|Coefficient of linear thermal expansion at 20° C||0,0000165 · K-1|
|Specific heat at 20° C||385 J/kg K|
|Latent smelting heat||205 kj/kg|
|Thermal conductivity at 20° C||391 W/m K|
|Electric resistivity at 20° C annealed physical state||0,017241 Ω mm2/m|
|Electric resistivity temperature coefficient at 20° C||0,00393 · K-1|
|Alloy for the production of LWC||Cu-DHP o CW024A (Cu = 99,90% min. - P = 0,015 ÷ 0,040%)|
|material condition||thickness||tensile strength||0,2% proof strength||elongation||average grain size||hardness|
|Y035||≥ 0,6 mm||210||35||80||40||30||60||-||-||-||-|
|nominal outside diameter|
|tolerances on nominal diameter|
|tolerances on mean nominal outside diameter||applicable to any diameter including deviation from circular form|
|3||6||± 0,06 mm||± 0,30 mm|
|6||10||± 0,06 mm||± 0,50 mm|
|10||20||± 0,08 mm||± 0,70 mm|
|20||30||± 0,12 mm||± 0,090 mm|
|EN 12735-2||tolerances on mean nominal outside diameter|
|wt ≤ 0,4 mm||wt > 0,4 mm|
|6||13||± 0,04 mm||± 0,04 mm|
|13||16||± 0,05 mm||± 0,04 mm|
|16||28||-||± 0,05 mm|
|EN 12735-2||maximum deviation from circular form|
|nominal wall thickness||for Ø from 6||Ø over 9,8||Ø over 13||Ø over 16||Ø over 22|
|over||up to||up to 9,8||up to 13||up to 16||up to 22||up to 67|
|-||0,41||4,00%||5,00%||7,00%||by agreement between the purchaser and the supplier|
|nominal outside diameter|
|tolerance on nominal wall thickness t|
|t from 0,3 mm up to and included 1 mm||t over 1 mm up to and included 3 mm|
|3||28||± 15%||± 13%|
|EN 12451||all wall ticknesses|
|all diameters||± 10%|
|tolerances||nominal outside diameter||nominal wall thickness e|
|d||from 0,25 up to and included 0,3||over 0,3 up to and included 0,35||over 0,35 up to and included 0,4||over 0,4 up to and included 0,5||over 0,5 up to and included 0,63||over 0,63 up to and included 0,8||over 0,8 up to and included 1,5||over 1,5 up to and included 3|
|over||up to and included|
|maximum permissible deviation at any pointa||6||133||± 0,025||± 0,03||± 0,03||± 0,04||± 0,05||± 0,06||± 8&b||± 15%b|
|tolerances on mean wall thickness||6||9,52||± 0,01||± 0,01||± 0,01||± 0,015||± 0,02||± 0,02||-||-|
|9,52||13||-||± 0,01||± 0,01||± 0,015||± 0,02||± 0,02||-||-|
|13||16||-||-||± 0,01||± 0,015||± 0,02||± 0,02||-||-|
|16||22||-||-||-||-||-||± 0,02||± 0,05||-|
|22||40||-||-||-||-||-||± 0,02||± 0,05||-|
a including deviation from concentricity.
b value in percentage of nominal thickness.