Tellurium-containing medium-carbon high-sulfur free-cutting steel, wire rod and production method of wire rod

Abstract

The invention discloses tellurium-containing medium-carbon high-sulfur free-cutting steel, a wire rod and a production method of the wire rod, and belongs to the technical field of free-cutting steel. The tellurium-containing medium-carbon high-sulfur free-cutting steel comprises the following chemical components in percentage by mass: 0.40 to 0.50 percent of C, 0.10 to 0.4 percent of Si, 1.3 to 1.7 percent of Mn, 0 to 0.025 percent of P, 0.24 to 0.33 percent of S, 0.001 to 0.008 percent of Al, 0.001 to 0.005 percent of Pb, 0.005 to 0.03 percent of Te, 0.0001 to 0.0005 percent of Ca and the balance of Fe and inevitable impurities, wherein the mass percentages of Mn, S and Te meet the following relational expressions: Mn/Te: 43-300, and Te/S: 0.015-0.125. The preparation method of the free-cutting steel comprises the steps that after tellurium modification treatment and RH treatment are finished, 1.45-8 m/t of tellurium-containing cored wires are fed into molten steel, the wire feeding speed is 166-189 m/min, and the wire feeding angle is 75-105 degrees. The inclusions which are uniformly dispersed and distributed in the free-cutting steel mainly comprise type I MnS, type I MnTe and composite inclusions of the type I MnS and the type I MnTe, the material plasticity is improved, the problem that cracking and the like easily occur in the machining processes of continuous casting, hot rolling, follow-up drawing, hot forging, cutting and the like is solved, the percentage elongation after fracture and the percentage reduction of area are increased, and the cutting performance is improved.

Description

technical field [0001] The application relates to the technical field of free-cutting steel, in particular, to a tellurium-containing medium-carbon and high-sulfur free-cutting steel, a wire rod and a production method for the wire rod. Background technique [0002] Free-cutting steel is mainly used in industries such as household appliances, instruments, and small automotive motors with large cutting and high automation. It is characterized by fast cutting speed, low tool loss, low processing cost and high surface finish of finished products. Usually, free-cutting steel is to add a certain amount of free-cutting elements (such as sulfur, phosphorus, lead, calcium, selenium, etc.) to the steel to improve its cutting performance. However, sulfur-containing steel has the problem of thermal brittleness, and cracks often occur during use, which brings huge economic losses to the subsequent processing and production of metals. [0003] Existing technology 1: A control method for...

AI Technical Summary

Problems solved by technology

[0009] According to the above problems, the method of adding tellurium to the medium-carbon high-sulfur free-cutting steel to improve the free-cutting performance needs to be improved urgently, so as to realize the control of inclusions in the medium-carbon high-sulfur free-cutting steel containing tellurium, improve the plasticity of the material, and improve the processing process, which is prone to cracking and other issues, improve cutting performance

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