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Production method of billet continuous casting bearing steel

A technology of billet continuous casting and production method, which is applied in the production field of billet continuous casting bearing steel, can solve the problems of internal cracks, cracks and high carbon content, and achieves reduced occurrence probability, high non-cleaning rate and surface good quality effect

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of steel has high carbon content and high content of alloys such as chromium, and the following problems exist in the billet continuous casting production process: slag pits on the surface of the continuous casting slab, cracks on the surface and subcutaneous of the slab, slag inclusion and segregation of the slab, Quality defects such as porosity, shrinkage cavity, internal cracking, etc., especially when the equipment technology such as light pressure and electromagnetic stirring is not carried out at the end of solidification, quality defects such as segregation, porosity, shrinkage cavity, internal cracking and other quality defects of continuous casting billet are more difficult to control
However, this prior art does not disclose a specific pouring method, and this prior art aims to improve the service life of the bearing by reducing the oxygen content in the steel, but cannot overcome the continuous Slag pits on the surface of the slab, cracks, slag inclusions, and segregation, porosity, shrinkage cavities, internal cracks and other quality defects on the surface and subcutaneous surface of the slab
[0005] Instead of denaturing molten steel inclusions, control the continuous casting process to reduce the probability of tundish nozzle clogging and overcome the slag pits on the surface of the continuous casting slab, the surface of the slab and the skin under the skin during the billet continuous casting production process. Cracks, slab segregation, porosity and other quality defects have not been reported in China

Method used

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Experimental program
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Effect test

Embodiment 1

[0035] This embodiment is used to illustrate a production method of billet continuous casting bearing steel provided by the present invention.

[0036] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine.

[0037] Send the refined molten steel to the continuous casting platform. The main components of this molten steel are: carbon 1.0%, silicon 0.27%, manganese 0.37%, chromium 1.50%, phosphorus 0.012%, sulfur 0.004%, T[O]: 0.0006%, Aluminum 0.02%, Calcium 0.0001%, the balance is iron and trace impurities. The temperature of the molten steel in the tundish was measured to be 1474°C, and the superheat of the molten steel was 26°C.

[0038] Turn on the electromagnetic stirring of the crystallizer, the current intensity is 380A, and the frequency is 3Hz. When molten steel is injected into the mold and reaches 2 / 3 of the height of the mold, mold powder is added, and the composition of the mold powder is SiO 2 : 32%, CaO: 23%, Al ...

Embodiment 2

[0045] This embodiment is used to illustrate a production method of billet continuous casting bearing steel provided by the present invention.

[0046] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine.

[0047] The molten steel after refining is sent to the continuous casting platform. The molten steel is mainly composed of 0.96% carbon, 0.28% silicon, 0.36% manganese, 1.48% chromium, 0.011% phosphorus, 0.003% sulfur, T[O]: 0.0005%, aluminum 0.03%, calcium 0.0001%, the balance is iron and trace impurities. The temperature of the molten steel in the tundish was measured to be 1472°C, and the superheat of the molten steel was 32°C.

[0048] The electromagnetic stirring of the crystallizer is turned on, the current intensity is 370A, and the frequency is 2.8Hz. When molten steel is injected into the mold and reaches 2 / 3 of the height of the mold, mold powder is added. The composition of the mold powder is: SiO 2 : 36.5%, CaO...

Embodiment 3

[0055] This embodiment is used to illustrate a production method of billet continuous casting bearing steel provided by the present invention.

[0056] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine.

[0057] The molten steel after refining is sent to the continuous casting platform. The main components of the molten steel are: carbon 0.98%, silicon 0.28%, manganese 0.40%, chromium 1.46%, phosphorus 0.010%, sulfur 0.002%, T[O]≤0.0005%, Aluminum 0.03%, Calcium 0.0001%, the balance is iron and trace impurities. The temperature of the molten steel in the tundish was measured to be 1473°C, and the superheat of the molten steel was 38°C.

[0058] The electromagnetic stirring of the crystallizer is turned on, the current intensity is 390A, and the frequency is 3.2Hz. When molten steel is injected into the mold and reaches 2 / 3 of the height of the mold, mold powder is added, and the composition of the mold powder is SiO 2 : 34...

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Abstract

The invention discloses a production method of billet continuous casting bearing steel. The method comprises the following steps: (1) injecting molten steel after refinement into a tundish and controlling the superheat degree of the molten steel in the tundish to be 25-45 DEG C; (2) injecting the molten steel in the tundish into a crystallizer for crystallization under the electromagnetic stirring effect of the crystallizer, and adding crystallizer protection slag into the crystallizer; (3) pulling out crystals from the crystallizer to obtain a continuous casting billet, and cooling the continuous casting billet by enabling the continuous casting billet to pass through a secondary cooling zone and an air cooling zone in sequence. According to the production method provided by the invention, the occurrence rate of nozzle clogging of the tundish can be reduced and the quality defects of slag pits in the surface of the continuous casting billet, cracks on the surface and under the skin of the casting billet, segregation and looseness of the casting billet and the like in a billet continuous casting production process are overcome.

Description

technical field [0001] The invention relates to a production method of billet continuous casting bearing steel. Background technique [0002] Bearing steel is widely used in automobile bearings and is in great demand. High-carbon chromium bearing steel (GCr15) is currently the most widely used in various industries, accounting for about 80%. However, this type of steel has high carbon content and high content of alloys such as chromium, and the following problems exist in the billet continuous casting production process: slag pits on the surface of the continuous casting slab, cracks on the surface and subcutaneous of the slab, slag inclusion and segregation of the slab, Quality defects such as porosity, shrinkage cavities, and internal cracks, especially when equipment technologies such as light pressure and electromagnetic stirring are not carried out at the end of solidification, quality defects such as segregation, porosity, shrinkage cavities, and internal cracks in co...

Claims

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Application Information

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IPC IPC(8): B22D11/16
Inventor 陈亮李扬洲陈天明杨文中黎建全曾建华陈永杨森祥潘红杨洪波
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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