Steel wire rod for copper clad steel composite shielded wire and production method of steel wire rod

Abstract

The invention relates to a steel wire rod for a copper clad steel composite shielded wire and a production method of the steel wire rod and belongs to the technical field of steel for communication cables. The chemical components of the steel wire rod include C, Si, Mn, P, S, Al, Ti and B; the balance of the steel wire rod includes Fe and unavoidable impurities; the mass percentage of C is smallerthan or equal to 0.010%; the mass percentage of Si is smaller than or equal to 0.010%; the mass percentage of Mn is smaller than or equal to 0.07%; the mass percentage of P is smaller than or equal to 0.010%; the mass percentage of S is smaller than or equal to 0.010%; the mass percentage of Al is smaller than or equal to 0.004%; the mass percentage of Ti is smaller than or equal to 0.003%; and the mass percentage of B ranges from 0.0060 to 0.0120%. The production method includes a billet smelting process, a billet heating process, a wire rod rolling process and a wire rod cooling process. According to the heating process, continuous casting billet heating and hot billet secondary heating are adopted, and the temperature of a heating furnace ranges from 1140 to 1160 DEG C. According to the wire rod cooling process, a slow cooling technique is adopted. The steel wire rod for the shielded wire has excellent drawing performance and excellent conductive performance; the steel wire rod canbe drawn to 0.08 mm with wire fracture avoided; and the conductivity of the steel wire rod can reach 16.3% or more.

Description

technical field [0001] The invention relates to a steel wire rod for a copper-clad steel composite shielding wire and a production method thereof, belonging to the technical field of steel for communication cables. Background technique [0002] Copper-clad steel is a composite wire with a copper layer wrapped around the steel wire. It combines the excellent properties of copper and steel. Compared with pure copper materials, it has the advantages of low cost, light weight, and high strength. It is widely used in the communication cable industry. Shielding wire is one of the products with the largest drawing amount (diameter after drawing is 0.08-0.12mm) among copper-clad steel, and has high requirements on the electrical conductivity and drawing performance of the steel. At present, the steel used for shielding wires on the market is mainly ultra-low carbon steel such as CH1T, which has excellent drawability and can be drawn to 0.08mm continuous wire, but the conductivity is...

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Problems solved by technology

Patent application CN103469061A discloses "an ultra-low carbon steel wire rod for electric conduction and its production method", the chemical composition ratio of the steel wire rod: C: 0.002-0.005%, Si: 0.004-0.010%, Mn: 0.05-0.15 %, P≤0.015%, S≤0.010%, total oxygen 0.0050-0.0080%, all aluminum≤0.0050%, wire rod grain size is 20-40μm, electrical conductivity is ≥15%, but its drawing performance is not reported

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