Cold-charge heating method of bearing steel continuous casting billet

A heating method and continuous casting billet technology, applied in the field of heat treatment, can solve the problems of surface cracks, coarse grains, decarburization, etc.

Active Publication Date: 2015-01-28
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if referring to the temperature in the above literature, the Φ650mm bearing steel continuous casting slab will be heated too fast in the preheating section, and heated for a long time at high temperature in the heating section, which will inevitably cause serious decarburization, coarse grains, and surface cracks and other defects

Method used

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  • Cold-charge heating method of bearing steel continuous casting billet
  • Cold-charge heating method of bearing steel continuous casting billet
  • Cold-charge heating method of bearing steel continuous casting billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] use figure 1 The process curve shown is for heating. The Φ650mm bearing steel continuous casting slab GCr15SiMn enters the slow cooling pit and slowly cools below 200°C after leaving the pit, and then puts it into the heating furnace in the cold state to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 600°C. The segmental billet is heated at a heating rate of 150°C / h for 4 hours;

[0029] The slab enters the preheating stage II at a heating rate of 150°C / h, and the heating time is 2 hours;

[0030] At this time, the temperature in the preheating stage II is 900°C, and the slab is heated at a heating rate of 150°C / h for 2 hours in the preheating stage II;

[0031] The slab enters the heating section I at a heating rate of 150°C / h, and the heating time is 1h;

[0032] At this time, the temperature in the heating stage I is 1050°C, and the slab is heated at a heating rate of 150°C / h for 1 hour in the heating stage I; ...

Embodiment 2

[0045] use figure 1 The process curve shown is for heating. The Φ650mm bearing steel continuous casting slab GCr15SiMn enters the slow cooling pit and slowly cools below 200°C after leaving the pit, and then puts it into the heating furnace in the cold state to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 550°C. The segmental billet is heated at a heating rate of 100°C / h for 5.5 hours;

[0046] The slab enters the preheating stage II at a heating rate of 100°C / h, and the heating time is 4.5h;

[0047]At this time, the temperature in the preheating stage II is 900°C, and the slab is heated at a heating rate of 100°C / h for 3 hours in the preheating stage II;

[0048] The slab enters the heating section I at a heating rate of 150°C / h, and the heating time is 1h;

[0049] At this time, the temperature of the heating stage I is 1050°C, and the slab is heated at a heating rate of 100°C / h for 1.5 hours in the heating stage I; ...

Embodiment 3

[0060] use figure 1 The process curve shown is for heating. The Φ650mm bearing steel continuous casting slab GCr15SiMn enters the slow cooling pit and slowly cools below 200°C after leaving the pit, and then puts it into the heating furnace in the cold state to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 600°C. The segmental billet is heated at a heating rate of 150°C / h for 4 hours;

[0061] The slab enters the preheating stage II at a heating rate of 150°C / h, and the heating time is 2 hours;

[0062] At this time, the temperature in the preheating stage II is 900°C, and the slab is heated at a heating rate of 200°C / h for 2 hours in the preheating stage II;

[0063] The slab enters the heating section I at a heating rate of 200°C / h, and the heating time is 0.75h;

[0064] At this time, the temperature in the heating stage I is 1050°C, and the slab is heated at a heating rate of 200°C / h for 1 hour in the heating stage I...

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Abstract

The invention discloses a cold-charge heating method of a bearing steel continuous casting billet, which comprises a preheating section I, a preheating section II, a heating section I, a heating section II and a soaking section. On the premise of not generating overburning and surface crack and ensuring the carbide uniformity to reach the standard, the method satisfies the cold-charge heating and rolling production of the bearing steel continuous casting billet.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a method for cold charging and heating of bearing steel continuous casting slabs. Background technique [0002] The continuous casting slab needs to be heated to a suitable rolling temperature in a heating furnace before rolling, and then rolled into a product. Due to the requirements of high fatigue life and high impact load, bearing steel has strict requirements on the uniformity of chemical composition, carbide uniformity and surface quality in the steel. The structure of bearing steel at room temperature is P+Fe 3 C. The heating process of the bearing steel continuous casting slab is actually the process of transformation from P to A, carbide diffusion and dissolution, and austenite homogenization. The continuous casting slab heating process plays a vital role in improving or eliminating the inhomogeneity of bearing steel carbides. If the heating process is unreasonable, it wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/70
CPCC21D9/70
Inventor 李丰功张继奎闻小德李猛马丙涛陈良刘超群吴明洋于学文刘利刘兵尹崇丽梁艳
Owner SHANDONG IRON & STEEL CO LTD
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