A kind of high-quality bearing steel wire rod and its production method

Abstract

The invention provides a high-quality bearing steel wire rod and a production method thereof. The wire rod comprises the following components in percentage by weight (wt%): 0.90%-1.05% of C, 0.15%-0.45% of Si, 0.25%-0.55% of Mn, 1.40%-1.65% of Cr, not more than 0.015% of P, not more than 0.010% of S, not more than 0.0020% of Ti, not more than 0.0008% of Mg, not more than 0.0012% of total oxygen and the balance of iron and inevitable impurities. The method comprises the following steps: performing pretreatment on molten iron to enable the content of sulfur to be not more than 0.0020%; smelting total iron water, performing deoxidation alloying on a high-purity iron alloy after being treated by a converter, wherein the content of magnesium in ferrochrome, ferromanganese and ferrosilicon is not more than 0.010%; refining low-alkalinity slag and weakly blowing argon to stir, wherein the alkalinity of top slag is 0.7-1.1, the time is 90-110min and the temperature is 1450-1580 DEG C; weakly blowing argon for treatment after refining; performing continuous casting on a large square billet and adopting electromagnetic stirring at the tail end of solidification, wherein the total time of a continuously rolled steel billet in the furnace is 8-10h, the soaking temperature is 1200-1250 DEG C and the finish rolling temperature is not lower than 950 DEG C; and the total time of the steel billet formed by rolling a wire in the furnace is 1.5-4h, the soaking temperature is 1150-1200 DEG C and the spinning temperature of the wire rod is 780-820 DEG C. Harmful inclusions in the produced wire rod are obviously reduced, and the residual inclusions in the wire rod are obviously refined.

Description

technical field [0001] The invention belongs to the field of high-carbon steel, and in particular relates to a high-carbon steel wire rod and a production method thereof. Background technique [0002] High-quality bearing steel wire rod needs to have good service fatigue life. This requires that the inclusions of the wire rod are not only small, but also have good deformability. In order to ensure that the inclusions in the wire rod can have a good coordinated deformation with the matrix during the wire rod drawing and subsequent processing, it is necessary to reduce the Al content in the inclusions as much as possible. 2 o 3 content. [0003] Publication No. CN101565801 invention patent introduces "a high-carbon chromium bearing steel and its manufacturing method"; the weight percentage distribution ratio of the chemical composition of the bearing steel is C: 0.90-1.05; Cr: 0.90-1.20; Mn: 0.90-1.25; Si : 0.45~0.75; Al: 0.02~0.04; oxygen≤0.0007; phosphorus≤0.010; sulfur≤...

AI Technical Summary

Problems solved by technology

Excessive magnesium content in the bearing steel wire rod leads to large-grained magnesium-aluminum spinel inclusions in the wire rod; in the refining process, improper inclusion control technology will also cause the inclusion size of the wire rod to be too large, which is not conducive to Subsequent processing of bearing steel wire rod

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