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

A high-carbon chromium bearing steel and hot-rolled wire rod technology, which is applied in metal rolling, metal rolling, workpiece heating devices, etc., can solve the problem of increasing the cost of the downstream spheroidizing annealing process, high grade of network carbide, and package shape Poor regularity and other problems, to achieve the effect of reducing the cost of spheroidizing annealing, reducing anisotropy, and uniform structure

Active Publication Date: 2022-06-03
LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select 150*150mm GCr15 continuous casting billet, the chemical composition is shown in Table 1.

[0035] Table 1 Chemical composition of bearing steel GCr15 (%)

[0036]

[0037] (1) The size of the continuous casting billet in converter smelting: 150*150mm, the billet passes through the preheating section at 830°C and the second heating section at 1160°C in the heating furnace to reach the soaking section at 1195°C.

[0038] (2) Heat preservation for 120min in the range of 1160~1200℃ in the high temperature section.

[0039] (3) The continuous casting billet comes out of the heating furnace, and after descaling by high pressure water, the rolling temperature is 1090℃, the laying temperature is 865℃, the swing amplitude of the laying machine is 5%, and it is rolled into a hot-rolled wire rod of Φ21mm.

[0040] (4) After spinning, cool down to about 570°C at a speed of 0.9°C / s, and collect the hot-rolled wire rods in a bundle; the running speed of the roller table is...

Embodiment 2

[0045] Select 160*160mm GCr15 continuous casting billet, the chemical composition is shown in Table 2.

[0046] Table 2 Chemical composition of bearing steel GCr15 (%)

[0047]

[0048] (1) The size of the continuous casting billet in converter smelting: 160*160mm, the billet passes through the preheating section at 855°C and the second heating section at 1190°C in the heating furnace to reach the soaking section at 1205°C.

[0049] (2) Heat preservation in the range of 1180-1210℃ in the high temperature section for 120min.

[0050] (3) The continuous casting billet comes out of the heating furnace, and after descaling by high pressure water, the rolling temperature is 1105℃, the laying temperature is 880℃, the swing amplitude of the laying machine is 4%, and it is rolled into a hot-rolled wire rod of Φ23mm.

[0051] (4) After spinning, cool down to about 585°C at a speed of 0.8°C / s, and collect the hot-rolled wire rod in a bundle. The running speed of the roller table is:...

Embodiment 3

[0057] Select 160*160mm GCr15 continuous casting billet, the chemical composition is shown in Table 3.

[0058] Table 3 Chemical composition of bearing steel GCr15 (%)

[0059]

[0060] (1) The size of the continuous casting billet in converter smelting: 160*160mm, the billet passes through the preheating section at 880°C and the second heating section at 1200°C in the heating furnace to reach 1220°C in the soaking section.

[0061] (2) Heat preservation for 130min in the range of 1190~1220℃ in the high temperature section.

[0062] (3) The continuous casting billet comes out of the heating furnace, and after descaling by high pressure water, the rolling temperature is 1120℃, the laying temperature is 900℃, the swing amplitude of the laying machine is 3%, and it is rolled into a hot-rolled wire rod of Φ25mm.

[0063] (4) After spinning, it is cooled to about 590°C at a speed of 0.7°C / s, and the hot-rolled wire rod is collected in a bundle. The running speed of the roller ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B45/00B21B37/74B21B15/00B21B45/02C22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C38/50C22C38/60
CPCB21B1/463B21B45/004B21B37/74B21B15/00B21B45/0203C22C38/02C22C38/04C22C38/44C22C38/42C22C38/002C22C38/06C22C38/50C22C38/60C22C38/008B21B2015/0057Y02P10/20
Inventor 杨兆全杨兆兵王鲁义纪文杰雷三祥顾腾飞陈庆丰曹磊
Owner LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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