Steel wire rod for 2000 MPa-grade spring and production method of wire rod

Abstract

The invention discloses a wire rod for a 2000 MPa-grade spring and a production method of the steel wire rod. The steel wire rod is prepared from the following chemical components of, 0.53%-0.57% of C, 1.51%-1.59% of Si, 0.65%-0.72% of Mn, 0.63%-0.7% of Cr, 0.01%-0.1% of Cu, 0.01%-0.1% of Ni, 0.01%-0.05 % of Mo, 0.01%-0.05% of Nb and the balance Fe and impurities. In a production method, a continuous casting reduction rate is 6.6%-8.7%, an initial rolling temperature of high-speed wire rolling is 910-950 DEG C, a finish rolling outlet temperature is less than or equal to 1020 DEG C, a spinning temperature is 820-880 DEG C, and a cooling speed of Stelmor cooling is 1.2-2.0 DEG C 11. The steel wire rod is of a bainite and pearlite structure, a tensile strength is 950 Mpa-1150 MPa, the percentage reduction of area is larger than or equal to 50%, and the steel wire rod can be used for preparing a spring with a strength of 2000 MPa.

Description

technical field [0001] The invention belongs to the technical field of steel production, and relates to a wire rod for springs and a production method thereof, in particular to a wire rod for 2000MPa springs. Background technique [0002] Spring is an important basic component, which is widely used in automobiles, machinery, railways and other fields. For example, in the automotive field, springs are used as safety-bearing components. Under the background of energy saving, emission reduction, and green development, the automotive industry is working on designing and using higher-strength springs to improve safety and reduce self-weight. Correspondingly, in order to meet the needs of the automobile industry for high-strength springs, the development of wire rods suitable for the production and manufacture of high-strength springs has become an important topic in the field of steel production technology. [0003] For the manufacturing needs of high-strength springs, the wire ...

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Problems solved by technology

[0003] For the manufacturing needs of high-strength springs, the wire rod itself is required to have excellent mechanical properties, including strength and drawability; in addition, the requirements for the purity and uniformity of the wire rod are extremely strict. During the service process, high-cycle alternating loads must be borne, and the service conditions are harsh. Defects such as poor purity and unevenness often become the source of cracks in the spring. Under the action of alternating loads, the cracks gradually expand and are "magnified", and Ultimately lead to spring breakage; moreover, purity and uniformity are also key factors affecting the drawability of the wire rod

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