A kind of production method of the steel wire rod used for the railway clip fastener of direct cold bending forming

Abstract

The invention discloses a production method of a steel wire rod prepared through direct cold roll forming and used for railway elastic strip fasteners. According to the production method, the hot metal desulphurization pretreatment controls the sulfur content at less than or equal to 0.002% and controls the Ti content at less than or equal to 0.03%; during the double slag method converter steelmaking, the converter smelting end point P is less than or equal to 0.080%, and the molten steel temperature is 1600-1650 DEG C; the sulfur content of the molten steel at the LF ending point is controlled at less than or equal to 0.006%; argon gas is weakly blown for more than 15 min after VD is subjected to vacuum damage; the superheat degree of the continuous casting molten steel is less than 30 DEG C; the pulling speed is 0.65-0.71 m / s, the heating temperature of the casting billet at a pre-heating section is less than 750 DEG C, the temperature of a first heating section is 900-970 DEG C, thetemperature of a second heating section is 1060-1100 DEG C, the temperature of a soaking section is 1000-1060 DEG C, and the in-furnace time is less than 110 min; and the fine rolling temperature is800-890 DEG C, the laying temperature is 810-860 DEG C, the roll table speed is 0.17-0.40 m / s, the heat-insulation cover is completely closed, and the fan and the lower louver are all closed.

Description

technical field [0001] The invention belongs to the technical field of wire rod production, and relates to a production method of a spring steel wire rod for railway spring fasteners directly formed by cold bending. Background technique [0002] According to the State Council's "Medium and Long-Term Railway Network Planning", the country will build a large-scale high-speed railway passenger dedicated line, and the operating mileage of the passenger dedicated line will reach more than 12,000 kilometers in the future. With the construction of high-speed railways, the demand for railway spring bars is also increasing. [0003] High-speed railway fasteners are subject to various forms of stress during use, and are prone to deformation and damage. Therefore, high purity and uniformity of steel is required to ensure that the spring bars have high elastic limit, yield limit and fatigue life. Ensure the stability and safety of train operation. [0004] High-speed railway fasteners...

AI Technical Summary

Problems solved by technology

Electric furnace smelting consumes a lot of energy, and the total compression ratio of the one-fired product is small, which will affect the compactness of the steel structure, which is not conducive to the refinement of inclusions, and poor fatigue performance

[0006] Patent CN 102162068A "A Spring Steel and Its Manufacturing and Heat Treatment Method", titled "Research and Development of Spring Steel 38Si7" (Author: Wu Chaobing, Sun Guangtao, Proceedings of the 2007 China Iron and Steel Annual Conference), "Water quenching of railway spring bars The development and application of spring steel 38Si7" (Authors: Zhai Zhenglong, Li Fenggong, etc.; "Special Steel", Volume 22, No. 4, 2001) The production process of spring steel wire rods disclosed in the paper also all adopts electric furnace smelting, high energy consumption

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