Large-specification high-carbon chromium bearing steel hot-rolled wire rod and high-speed wire rod production method thereof

Abstract

The invention provides a large-specification high-carbon chromium bearing steel hot-rolled wire rod and a high-speed wire rod production method thereof. The method comprises the following steps that (1) a continuous casting square billet is heated in a heating furnace, the temperature of a preheating section ranges from 830 DEG C to 880 DEG C, the temperature of a heating section ranges from 1150DEG C to 1210 DEG C, and the temperature of a soaking section ranges from 1190 DEG C to 1220 DEG C; (2) the continuous casting square billet is subjected to heat preservation in a high-temperature section, and the heat preservation time is larger than or equal to 120 min; (3) the continuous casting square billet is rolled through a high-speed rolling mill, the initial rolling temperature is controlled to be 1090-1120 DEG C, the spinning temperature is controlled to be 860-900 DEG C, the swing amplitude of a spinning machine is controlled, and the continuous casting square billet is rolled intoa hot-rolled wire rod; (4) the rolled hot-rolled wire rod is cooled to be larger than or equal to 550 DEG C at the cooling speed of 0.7-0.9 DEG C / s, the speed of a Stelmor line roller way is controlled, coil collection is carried out, and then air cooling is carried out to reach the room temperature; (5) surface quality inspection, finishing and sampling are carried out on the collected hot-rolled wire rod; and (6) the finished hot-rolled wire rod is quickly packaged online. According to the high-speed wire rod production method, the bearing steel hot-rolled wire rod with phi 21-25 mm is produced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-scale high-carbon chromium bearing steel hot-rolled wire rod and a high-speed wire rod production method thereof. Background technique [0002] High carbon chromium bearing steel is the most widely used and widely used type of bearing steel. Abrasiveness, tissue stability and surface quality, etc. [0003] Usually, large-scale bearing steel hot-rolled wire rods of Φ21-25mm are generally used to produce bearing steel ferrules, and large-scale coils are mostly used for production, while high-speed wire rod production lines are rarely used. Compared with the large coil production line, the high-speed wire rod production line has the characteristics of fast and suitable cooling speed, less coarse pearlite structure, easy control of carbide uniformity, and is conducive to subsequent spheroidizing annealing. However, it also has the characteristics of high diff...

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Problems solved by technology

However, there are also the characteristics of high difficulty in packaging, poor package shape regularity, and prominent surface defects caused by repeated packaging.

[0004] Bearing steel hot-rolled wire rods are generally delivered in a hot-rolled state, and are used after spheroidizing and annealing by downstream bearing processing companies. For large-scale coil production lines, there is no suitable controlled rolling and cooling process for large-scale bearing steel hot-rolled wire rods. Conventional hot rolling process can be used, but the level of network carbide is higher, which will increase the cost of downstream spheroidizing annealing process

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