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Steel strand is a steel product composed of multiple steel wires. The surface of carbon steel can be coated with galvanized layer, zinc-aluminum alloy layer, aluminum-clad layer, copper plated layer, epoxy resin coating, etc. Industrial steel strands are important hardware used for the reinforcement and safety of concrete structures. There are 7 types of industrial steel strands. While almost all industrial strand is made of steel, there are several different types of industrial strand created for different applications. These include:

1. Unbonded steel strand:

Most uses for unbonded strand involve post-tensioning. The steel strands in use can be separated from the concrete through anti-corrosion grease and polyethylene plastic, allowing the steel strands to move freely within the layer, making construction more convenient. Unbonded PC strands have very little friction between them and can be easily bent into various curved shapes.

2. Bonded steel strand:

It has high tensile strength, strong connection with concrete, stable construction, and good combination with reinforced concrete. It also saves material, reduces deformation and structural weight, and improves stiffness, wear resistance and waterproofing.

3. Spiral ribbed steel strand:

Spiral ribbed strands are comparable to bonded strands in terms of strength and durability and can be used in precast concrete elements. The surface of the steel wire adopts a spiral rib design, which is unique. This unique design provides better adhesion to concrete, making it an excellent choice for construction under pressure.

4. Zigzag strand:

The surface texture of zigzag strands is similar to that of spiral rib strands. This kind of steel strand has high strength and long life, and is often used to manufacture precast concrete components such as beams and columns.

5. Stranded wire:

Multistrand bends fairly easily compared to other strands, making it an excellent choice for curved or oddly shaped buildings.

6. Coated steel strand:

In terms of elasticity, coated strands are comparable to unbonded strands, but they include a protective coating to prevent corrosion. This strand has better bonding qualities and weather resistance, making it ideal for post-tensioning applications.

7.Prestressed steel strand:

In terms of strength and durability, prestressed strands are comparable to bonded strands; however, they are prestressed to increase the strength and stability of concrete structures. Known for its ability to withstand high stress levels, this type of steel strand is often used in construction with precast concrete elements such as beams and columns.