The steel strand is a steel product composed of multiple steel wires twisted. The carbon steel surface can be added with galvanized layer, zinc-aluminum alloy layer, aluminum clad layer, copper-plated layer, and epoxy-coated layer as required. 

The manufacturing process is divided into monofilament manufacturing and stranded wire manufacturing. (Cold) wire drawing technology is used when making monofilament. According to different products, the material can be a high carbon steel wire rod, stainless steel wire rod, or medium and low carbon steel wire rod. Zinc shall be electroplated or hot-dipped on the monofilament. In the strand manufacturing process, a stranding machine is used to strand multiple steel wires into a product. The prestressed steel strand needs to be continuously stabilized after forming. The final product is generally collected on a reel or rolled without a shaft.

Galvanized steel strands usually refer to messenger wires, guy wires, core wires or strength members, etc., and can also be used as earth wires/ground wires for overhead power transmission, Barrier cables on both sides of roads, or structure cables in building structures. The prestressed steel strands commonly used in prestressed steel strands are uncoated low-relaxation steel strands (uncoated steel strands for prestressed concrete), and there are also galvanized (galvanized), which are often used in bridges, construction, water conservancy, and energy. And geotechnical engineering, unbonded steel strand (unbonded steel strand or mono strand) is often used in floor, foundation engineering, etc.

The steel-strand prestressed tension construction design controls the tensile force, which refers to the tension of the steel strand before the anchoring fixture after the prestressed tension is completed. Therefore, when calculating the theoretical elongation of the prestressed tension of the steel strand, the distance between the anchor points at both ends of the steel strand should be used as the calculated length of the steel strand, but the control tension of the steel strand during the prestressed tension The tension is controlled at the anchor of the jack tool, so for the convenience of control and calculation, the distance between the anchor points at both ends of the steel strand and the working length of the steel strand in the tension jack are generally used as the pre-set value of the steel strand. The calculated length of the stress tension theoretical elongation. When the steel strand is prestressed and stretched, most of the exposed part of the steel strand is wrapped by the anchorage and the jack. The tensile length of the steel strand cannot be directly measured on the steel strand, so it can only be measured with The piston stroke of the tensioning jack is used to calculate the tension elongation value of the steel strand. Still, at the same time, the retraction of the anchor plug during the whole tensioning process of the steel strand should also be subtracted. The bearing capacity of the strand should be 4-6 times the total traction.