A large-scale high-carbon chromium bearing steel hot-rolled wire rod and its high-speed wire rod production method

Abstract

The invention provides a large-scale high-carbon chromium bearing steel hot-rolled wire rod and its high-speed wire rod production method, comprising the following steps: (1) heating the continuous casting billet in a heating furnace, the temperature in the preheating section is 830-880°C, The temperature in the heating section is 1150-1210°C, and the temperature in the soaking section is 1190-1220°C; (2) The continuous casting billet is kept warm in the high temperature section, and the holding time is ≥120min; (3) The continuous casting billet is rolled by a high-speed rolling mill , control the rolling start temperature at 1090-1120°C, and the spinning temperature at 860-900°C, control the swing amplitude of the laying machine, and roll the continuous casting billet into a hot-rolled wire rod; Cool the strips at a cooling rate of 0.7-0.9°C / s to ≥550°C, control the speed of the Stelmore wire roller table and collect the coils, and then air-cool to room temperature; Surface quality inspection, finishing, sampling; (6) Quickly pack the finished hot-rolled wire rod online. The invention utilizes a high-speed wire rod production line to produce a Φ21-25mm bearing steel hot-rolled wire rod.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-size 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. It is a common steel for manufacturing rolling elements and rings. It usually requires materials with high contact fatigue strength, hardness and purity, and excellent resistance. abrasiveness, tissue stability and surface quality. [0003] Usually, Φ21-25mm large-size bearing steel hot-rolled wire rod is generally used to produce bearing steel ferrules, and large coils are mostly used in production, and 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 flake p...

AI Technical Summary

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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