For the production of 2, 3 and 7 wire strands for prestressed concrete, we use high resistance wires made from cold drawing of high carbon wire rod (average 0,82%).
2 or 3 wire strands are made of wires rolled in a helicoidal way around their longitudinal axis with a rolling up equal to 14/22 times the nominal diameter of 2, 3 wire strand.
7 wire strands are made of 6 wires rolled in a helicoidal way around a central wire having a slightly wider diameter.
They have a rolling up equal to 14/18 times the nominal diameter of 7 wire strand.
2, 3 and 7 wire strands:
italian Law 5/11/1971 n° 1086 M.D. 14/01/2008
MPA (Germany) 7 wire strands tensile strength 1770-1860
ASQPE (France) 7 wire strands tensile strength 1860
ICECON (Romania) 2,3 and 7 wire strands tensile strength 1860
EMPA (Switzerland) 7 wire strands tensile strength1770-1860
Certifications
UNI EN ISO 9001:2008
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