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Continuous casting technology for reducing carbon segregation of wind electricity medium carbon steel continuous casting round billet

A continuous casting round billet and continuous casting process technology, applied in the field of metallurgy, can solve problems such as poor steel quality, harmful steel performance, and large fluctuations in molten steel temperature, so as to reduce the degree of carbon segregation and meet strict requirements.

Active Publication Date: 2017-04-05
建龙北满特殊钢有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the temperature of molten steel fluctuates greatly during the pouring process, the quality of steel deteriorates, and it is easy to cause nozzle blockage
If rare earth elements are added in the tundish, it will cause nozzle blockage, and Ca and Ti are harmful to the performance of steel grades.

Method used

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  • Continuous casting technology for reducing carbon segregation of wind electricity medium carbon steel continuous casting round billet

Examples

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Effect test

Embodiment 1

[0019] This embodiment provides a continuous casting process for reducing carbon segregation of carbon steel continuous casting round billets in wind power, which is produced by the process of converter steelmaking, LF refining, RH vacuum degassing, Φ550mm large cross-section round billet continuous casting, and slow cooling Φ550mm large cross-section continuous casting round billet, using this continuous casting process, the degree of carbon segregation deviation of the round billet can be effectively reduced, and the carbon segregation deviation of the continuous casting round billet is controlled within 0.05%. The specific requirements are as follows:

[0020] 1. Converter steelmaking: During the carburization process after BOF smelting and tapping, the argon blowing argon at the bottom of the ladle and the amount of carburization are controlled to ensure strong stirring at 400-600L / min and 8.0-10.0bar argon blowing at the bottom of the ladle. 0.20~0.30% control; after 10 mi...

Embodiment 2

[0029] The difference between this example and Example 1 is that the continuous casting process parameters adopted are as follows: the electromagnetic stirring parameter of the crystallizer is 380 / 3.0Hz, and the stirring method adopts alternating electromagnetic stirring: positive 15s, stop 7s, reverse 15s, stop 7s; The terminal electromagnetic stirring parameter is 200A / 3.0Hz, and the stirring method adopts alternating electromagnetic stirring: positive 25s, stop 5s, reverse 25s, stop 5s; the crystallizer cooling water flow rate is 4700L / min (± 35L), and the secondary cooling spray water volume is 0.18L / min, the water distribution in each zone is 48%, 32%, 20%, and the casting speed is 0.33m / min under the working condition of 25-40°C.

[0030] The slab carbon segregation range produced by the continuous casting process of this embodiment is 0.40-0.47%.

Embodiment 3

[0032] The difference between this example and Example 1 is that the continuous casting process parameters adopted are as follows: the electromagnetic stirring parameter of the crystallizer is 300 / 3.0Hz, and the stirring method adopts continuous electromagnetic stirring; the terminal electromagnetic stirring parameter is 280A / 3.0Hz, and the stirring method Alternate electromagnetic stirring is adopted: forward 25s, stop 5s, reverse 25s, stop 5s, crystallizer cooling water flow rate is 4700L / min (±35L), secondary cooling spray water volume is 0.18L / min, water distribution in each area is 48%, 32%, 20%, the casting speed is 0.33m / min under the working condition of 25~40℃.

[0033] The slab carbon segregation range produced by the continuous casting process of this embodiment is 0.38-0.50%.

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Abstract

The invention discloses a continuous casting technology for reducing carbon segregation of a wind electricity medium carbon steel continuous casting round billet. The technological processes of converter steelmaking, LF refining, RH vacuum degassing, large-section round billet continuous casting and slow cooling are adopted. The stirring mode with crystallizer electromagnetic stirring and tail-end electromagnetic stirring being combined is adopted in the continuous casting round billet, the crystallizer electromagnetic stirring parameter is 380A / 3.0Hz, and alternate or continuous electromagnetic stirring serves as the stirring mode. The tail-end electromagnetic stirring parameter is 200 / 3.0Hz, and alternate electromagnetic stirring serves as the stirring mode. The crystallizer cooling water flow is 4700L / min(+ / -35L), the secondary-cooling spraying water volume is 0.18L / min, water allocation of all zones is 50%, 35% and 15% separately, and the pulling rate is 0.33m / min when the degree of superheat of molten steel is in the working condition of 25-40 DEG C. By means of the continuous casting technology, the carbon segregation degree is effectively lowered, and the strict requirement for the carbon segregation of wind electricity medium carbon steel is met.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a continuous casting process for continuous casting of medium carbon steel and carbon billets for large-section wind power. Background technique [0002] Medium carbon steel for wind power is widely used in wind power yaw pitch and other fields. Due to the extremely harsh working environment of wind power steel, the performance and hardenability of the finished product are extremely strict, so carbon segregation has become a medium carbon steel technology for wind power. One of the most important problems of quality control. Because during the solidification process of the slab, the surface layer is quenched to form fine equiaxed crystals. As the thickness of the surface layer solidifies, the heat transfer capacity inside the slab decreases, and the slab begins to present directional solidified columnar crystals, forming carbon segregation. [0003] The existing methods to redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/12B22D11/124C21C7/072C21C7/10
CPCB22D11/115B22D11/122B22D11/124C21C7/072C21C7/10
Inventor 张立明申祖锋董贵文李瑛李颇张岩马天超刘光辉徐博李殿生曲景文吴虎男张泽春李艾李庆斌姚凤祥王秀兰陈金富任辉耀贾勇王兴华尹久会刘文杰王刘艳王雪威李明
Owner 建龙北满特殊钢有限责任公司
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