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Carbon steel wire refers to a prestressed steel wire with carbon content not exceeding about 0.9%. Most of the carbon steel wires used as prestressing bars in my country are high-strength steel wires and cold-drawn low-carbon steel wires. Increasing the carbon content (>0.9%) can improve the strength and hardness of the steel wire like cold work and heat treatment, but it will reduce its plasticity, toughness, and weldability.

Wire rods are mainly used as blanks for wire drawing, and can also be directly used as building materials and processed into mechanical parts.Wire rod, also known as wire rod, usually refers to small diameter round steel in coils. The diameter of the wire rod is in the range of 5-19 mm (usually 6-9 mm), and its lower limit is the minimum size of the hot rolled steel section.