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Method for reducing carbide liquation level in high-carbon chromium bearing steel

A high-chromium bearing and carbide technology, applied in the field of steel processing, can solve problems such as prolonging heating time and economic loss, and achieve the effects of improving cost performance, protecting the environment and saving energy.

Active Publication Date: 2014-12-17
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The article "Research on the relationship between carbide liquidation and heating process of GCr15 steel" introduces the relationship between carbide liquidation of GCr15 bearing steel and heating temperature and heating time. Although the level of carbide liquidation in steel can be controlled or reduced, but It is necessary to increase the temperature and prolong the heating time, resulting in economic loss

Method used

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  • Method for reducing carbide liquation level in high-carbon chromium bearing steel

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Experimental program
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Effect test

Embodiment 1

[0028] The main components of GCr15 bearing steel A are: [C]: 1.01%, [Si]: 0.24%, [Mn]: 0.36%, [Cr]: 1.52%, [P]: 0.013%, [S]: 0.002%, [Mo]: 0.04%, [Cu]: 0.15%, [Ni]: 0.04%, and the rest are iron and impurities.

[0029] The section size of electric furnace smelting and continuous casting slab is: 150×150mm, the temperature of continuous casting tundish is respectively: 1475°C, 1470°C, 1467°C (the liquidus temperature of GCr15 steel is: 1450°C, and the degree of superheat is: 25°C, 20°C, 17°C);

[0030] The continuous casting slab is heated in a built-in regenerative walking heating furnace with a length of 34m×width of 9.8m. The temperature of the heating section is controlled within the range of 1150-1175°C, and the temperature of the soaking section is within the range of 1155-1175°C;

[0031] The whole heating time is controlled as 130min;

[0032] The combustion reversing period of the heating furnace is 100s, of which the combustion time and the cease-fire time are 50s ...

Embodiment 2

[0036] The main components of GCr15 bearing steel B are: [C]: 0.99%, [Si]: 0.29%, [Mn]: 0.33%, [Cr]: 1.49%, [P]: 0.011%, [S]: 0.001%, [Mo]: 0.04%, [Cu]: 0.12%, [Ni]: 0.03%, and the rest are iron and impurities.

[0037] Converter smelting and continuous casting slab section size: 240×240mm, continuous casting tundish temperature: 1467°C, 1462°C, 1460°C (superheat: 17°C, 12°C, 10°C);

[0038] The continuous casting slab is heated in a built-in regenerative walking heating furnace with a length of 24m×width of 9.8m. The temperature of the heating section is controlled in the range of 1185-1220°C, and the temperature of the soaking section is in the range of 1180-1220°C;

[0039] The whole heating time is controlled to 240min;

[0040] The combustion reversing period of the heating furnace is 180s, of which the combustion time and the cease-fire time are 90s respectively, and the initial combustion flame injection angle is set at 9°, and every 15s, use the adjustment plate in th...

Embodiment 3

[0044] The main components of GCr15 bearing steel C are: [C]: 1.00%, [Si]: 0.25%, [Mn]: 0.30%, [Cr]: 1.45%, [P]: 0.012%, [S]: 0.002%, [Mo]: 0.04%, [Cu]: 0.13%, [Ni]: 0.02%, and the rest is iron and impurities.

[0045] Converter smelting and continuous casting slab section size: 200×200mm, continuous casting tundish temperature: 1471°C, 1462°C, 1465°C (superheat: 21°C, 12°C, 15°C);

[0046] The continuous casting slab is heated in a built-in regenerative walking heating furnace with a length of 24m×width of 9.8m. The temperature of the heating section is controlled in the range of 1170-1210°C, and the temperature of the soaking section is in the range of 1175-1210°C;

[0047] The whole heating time is controlled as 180min;

[0048] The combustion reversing period of the heating furnace is 150s, of which the combustion time and the cease-fire time are 75s respectively, and the initial combustion flame injection angle is set to 11°. Every 15s, use the adjustment plate in the no...

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Abstract

The invention discloses a method for reducing a carbide liquation level in high-carbon chromium bearing steel. The method comprises the following steps: (1) the superheat degree of continuous casting steel liquid is controlled in a range of 10-25 DEG C in smelting; (2) the temperature of a heating section and the temperature of a soaking section of a continuous casting steel blank obtained after heating and smelting are controlled; (3) the heating time is controlled according to the section size of the continuous casting steel blank; and (4) the flame spraying angle and the burning time of a heating furnace are controlled by a following manner in the burning reversing period of the heating furnace by using an adjusting plate in a nozzle; the flame spraying angle is uniformly adjusted from m degrees to n degrees; in reversing, the adjusting plate in the nozzle is transferred to the original position; m is 9-11; and n is 14-18. Compared with the prior art, the adjusting plate is only required to be added on the burning nozzle of the heating furnace, so that the burning airflow angle is slightly adjusted without transforming equipment and largely adjusting a process, and the temperature uniformity of the casting blank heated in the furnace can be guaranteed so as to achieve the control or reduction of the carbide liquation level in the bearing steel.

Description

technical field [0001] The invention relates to a production method of high-carbon chromium bearing steel, in particular to a method for reducing the liquid analysis level of carbides in high-carbon chromium bearing steel, and belongs to the technical field of steel processing. Background technique [0002] High-carbon chromium bearing steel (high-carbon chromium bearing steel specified in the standard includes: GCr4, GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo and other five steel grades, among which GCr15 is the representative) is mainly used to manufacture bearing rolling elements. The structure of chromium bearing steel is that excessive carbides are distributed on the martensite matrix. This is because the high carbon content of chromium bearing steel is high, and it also contains a certain amount of chromium, and there are a large number of eutectic carbides in the slab. , most of these carbides melt back into the austenite when the billet is heated, but a small amount of car...

Claims

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Application Information

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IPC IPC(8): C21D1/52C21D9/70C21D11/00B22D11/16C21D6/00
Inventor 陈庆丰许竹桃杜方陈华强余爱华孙晶李献忠汪菊华黄海玲张青山张贤忠张渊普
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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