Spring steel for microalloying cold forming stabilizer bar and manufacturing method of spring steel

Through microalloy design and optimization of smelting and rolling processes, the problems of purity, bending and surface quality of spring steel for automotive stabilization rods in the cold forming process are solved, and the effects of high strength, high toughness and lightweight design are achieved.

CN119710443APending Publication Date: 2025-03-28JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Patent Information

Application Number
CN202411615291.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-13
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing spring steel for automotive stabilization rods is difficult to meet the requirements of high purity, low bending and high surface quality in the cold forming process, which affects the lightweight design and service life of automotive parts.

Method used

Through microalloy design, the chemical composition of the steel is controlled, including the content range of elements such as C, Si, Mn, Cr, P, S, Mo, Ni, Cu, etc., combined with continuous casting and rolling processes, the molten steel smelting and cooling process is optimized to ensure high purity and excellent mechanical properties of the steel.

Benefits of technology

It achieves high purity, low bending and high surface quality of steel, improves tensile strength, yield strength and cross-section shrinkage, meets the high strength and high toughness requirements of the automobile stabilizer, and is conducive to the lightweight design of automobile parts.

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Abstract

The invention relates to spring steel for a microalloying cold forming stabilizer bar and a manufacturing method of the spring steel. The spring steel comprises the following chemical components in percentage by mass: 0.51 to 0.59 percent of C, 1.20 to 1.60 percent of Si, 0.50 to 0.80 percent of Mn, 0.50 to 0.80 percent of Cr, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.05 percent of Mo, 0.05 to 0.20 percent of Ni, 0.05 to 0.20 percent of Cu and the balance of Fe and inevitable impurity elements. In order to meet the requirements of the spring steel for the cold-formed automobile stabilizer bar, a continuous casting square billet which is produced by using microalloying-designed chemical components and high molten steel purity and optimizing a continuous casting process and is high in quality, low in center segregation and looseness, free of cracks and high in steel purity is directly used as a blank; and the spring round steel meeting the requirement is manufactured by adopting a method of controlled rolling and controlled cooling. The diameter of the round steel is 10-20 mm, the bending degree is smaller than or equal to 1 mm / m, the tensile strength is 900-1150 MPa, and the percentage reduction of area is larger than or equal to 50%. And the surface has no decarburization and no work-hardened layer.
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