Carbon steel wire refers to prestressed steel wire with a carbon content not exceeding about 0.9%. The carbon steel wire used for prestressed reinforcement in China is mostly high-strength steel wire and cold-drawn low-carbon steel wire. Increasing the carbon content (>0.9%), like cold work and heat treatment, can improve the strength and hardness of steel wire, but it will reduce its plasticity, toughness, and weldability.

Carbon steel wire (also known as high-strength steel wire) is made from high-quality high carbon steel wire rods after being subjected to Soxhlet treatment, acid pickling, copper plating or phosphating, and then cold drawn. Carbon steel wire is made of 80 steel, with a carbon content of 0.7% to 0.9%. Carbon steel wire can be divided into cold drawn steel wire, stress relieving steel wire, scored steel wire, low relaxation steel wire, and galvanized steel wire according to the requirements of deep processing.

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The properties of carbon steel are high hardness, strength, wear resistance and anti-corrosion.