Medium carbon steel wire rod with high strength and high plasticity and production method thereof

Abstract

The invention discloses a medium carbon steel wire rod with high strength and high plasticity and a production method thereof. The medium carbon steel wire rod comprises the following one or more chemical components in percentage by weight: 0.40 to 0.50 percent of C, 0.15 to 0.40 percent of Si, 0.70 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Al, less than or equal to 0.05 percent of Ti, less than or equal to 0.005 percent of B, less than or equal to 0.40 percent of Cr and the balance of Fe andunavoidable impurities; the production method comprises the processes of melting, heating billet, wire rod rolling and wire rod cooling. The tensile strength of the medium carbon steel wire rod is larger than or equal to 700 MPa, the reduction of are is larger than or equal to 55 percent, the elongation is larger than or equal to 28 percent; the microscopic structure is formed by granular ferriteand fine lamellar pearlite, the particle size of the ferrite is 7 to 9 grade, the Wechsler tissue level is less than or equal to 1 grade; the steel wire rod used by drawing of a client can keep highstrength and plasticity index.

Description

technical field [0001] The invention belongs to the technical field of wire rod production, and in particular relates to a medium-carbon steel wire rod with high strength and high plasticity and a production method thereof. Background technique [0002] Medium carbon structural steel is mainly used in the production of various shaft parts, used in automobile, machinery and other industries, and requires good strength and plasticity indicators. Since the wire rod needs subsequent drawing and surface grinding treatment, its strength and plasticity are mainly guaranteed by the performance of the base metal hot-rolled wire rod. According to the knowledge of materials science, strength and plasticity are a pair of contradictory indicators, that is, when the strength is increased, the plasticity index will be reduced at the same time. [0003] Patent No. CN102011051A discloses a "high-strength and high-plasticity medium-carbon transformation-induced plasticity steel and its prepa...

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Problems solved by technology

[0004] None of the steel types mentioned in the above patents provide a solution for improving the strength and plasticity of medium carbon steel

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