P.C. strand - 7 wire

Pc strand 

Strand is produced in the SLM facility for prestressed reinforced concrete for applications in construction and in pre/post tension structures.  The facility performs cold drawing of high carbon wire rod and stranding of drawn wires. 

For specific or demanding applications we can offer a wide array of products which includes high and very high  tensile strength, indented, dyform , unbonded greased - waxed and HDPE sheathed strand. PC Strand consists of a group of seven cold drawn wires having a central wire (core wire) around which are helically spun six wires in one layer and with uniform pitch.

Diameter Range: 
6,85 – 18 mm
Tensile Strength Range: 
1770 – 2060 Mpa
Coil Weight: 
1500 - 4000 kg
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Siderurgica Latina Martin

Via Oger Martin 21
03024 Ceprano FR
Italy
Phone: +39 0775 91991
Fax Number: +39 0775 9199222

Headquarters
Via Oger Martin 21
03024 Ceprano FR
Italy
Phone: +39 0775 91991
Fax Number: +39 0775 9199222

Picking

The wire rod is descaled in order to remove the mill scale present on its surface through a chemical descaling process (Pickling) and then it is pre-coated with carrier coating to facilitate the adherence of lubricant during the wire drawing process.

Cold Drawing

The wire rod is cold drawn through dry drawing machines equipped with a series of 9/11 lubricated dies that reduce its cross sectional area and allow to achieve the desired mechanical properties.

Winding of drawn wire into spools

The cold drawn wire is wound into spools.

Spools unwinding

The set of 7 spools (nr. 6 spools with outer wires and nr 1 spool with central wire) are placed into stranding machines to be synchronously unwound and stranded.

Stranding

The stranding machines wind the drawn wires into a 7-wire strand which consists of a central wire around which are helically spun six wires, in one layer and with uniform pitch.

Thermo-mechanical treatment

The strand is subjected to a thermo-mechanical process in which the strand is continuously heated while under tension in order to relieve the residual drawing stresses and reduce the relaxation losses.

Winding of strand into master coil

The strand is wound into a master coil.

Master coil rewinding and coiling

Master coil is rewound into single finished coils of strand of desired size and packaging.

Construction steels