Cold Stretching and
Machines and wire equipments
Cold Stretching and Respooling Machines
Cold stretching and respooling machines are used to produce cold stretched steel wire in coils and bars.
Cold stretching and respooling machines manufactured by Promostar are complete lines or just single unit able to transform the rebar in coil with the process of stretching (through stretching panels equipped with rolls) in order to increase the mechanical properties of the wire according to the market requirements in terms of tensile strength, yield strength and final elongation (normally called Agt) practically without changing the entry wire diameter.
The final product applications are normally reinforcing mesh, stirrups, cages and lattice girders for the civil and industrial construction, foundations and precast industry.
Compared to a hot rolling plant, the advantages of a stretching rolling plant are the much lower investment costs, the cheaper cost of the steel heat (no need to add expensive alloy elements), the space required for the installation, greater flexibility and rapidity production changes of the diameter sizes, the quality of packaging of the final product, the limited number of operators (usually only one operator controls the whole plant) and the production and maintenance costs.
Due to the continuous improvement made by our internal research and development department, we are able to supply complete machines or just single unit that, depending on the quality of the entry rebar in coil material, can produce exit wire material compliant to the local countries norms for the concrete applications like for example (but not only): ASTM A82, ASTM A706, ASTM A1064, DIN 488, SFS1300, IRAM/IAS U500, NCH1173, NBR7480, NCT2289, AS/NZS4671, NTP339 for the production of material according to the grade B500B, B500C, grade 60, grade 80, CA-50 and CA-60.
Thanks to more than 40 years of experience in the field of process of rolling, we manufacture high performances automatic turn key plants, that are tailor made on the needs of our customers in terms of layout, products sizes, mechanical properties, level of automation and which allow to finally reduce the transformation costs for each tons of steel wire produced.
Our offer is not limited to the construction of machines and equipment. If required, we are also able to supply valid training, technical assistance and consulting to improve the production of the cold roll process; These services are the keys to reach the target and maintain it over time in terms of efficiency and performance of the plant as well as in terms of correct mechanical properties of the wire produced.
|Working Speed (max)
|Up to 14 m/s for coils/spools
Up to 8 m/s for bars
|Inlet Wire Diameter
|6 ÷ 20 mm
|Wire quality at entrance
|low carbon rebar in coil
|Outlet wire diameter
|6 ÷ 20 mm
|Type of wire at exit
|Ribbed wire compact coils or bars
|Coil weight (max)
|Up to 8 tons
|Up to 12 m