Continuous-cast steel billet with optimized surface quality and manufacturing method of such continuous-cast steel billet

A manufacturing method and technology of surface quality, applied in the field of metal processing, which can solve problems such as dents, longitudinal cracks, etc.

Active Publication Date: 2018-12-28
吕梁建龙实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that depressions or longitudinal cracks may appear on the surface of the existing continuous casting billet, the present invention provides a method for manufacturing the above-mentioned continuous casting billet with optimized surface quality

Method used

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  • Continuous-cast steel billet with optimized surface quality and manufacturing method of such continuous-cast steel billet
  • Continuous-cast steel billet with optimized surface quality and manufacturing method of such continuous-cast steel billet
  • Continuous-cast steel billet with optimized surface quality and manufacturing method of such continuous-cast steel billet

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Experimental program
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Effect test

Embodiment 1

[0021] This embodiment provides a continuously cast billet with optimized surface quality. The continuous casting billet is composed of the following elements by weight percentage:

[0022]

[0023] The balance is Fe and unavoidable impurities.

[0024] The cross-sectional size of the continuous casting billet is 270mm×315mm, and its manufacturing method is as follows:

[0025] The molten steel containing the elements in the above weight percentage is injected into the tundish through the ladle long nozzle, and then the molten steel in the tundish flows into the crystallizer through the submerged nozzle, and the distance between the submerged nozzle and the outer arc side of the crystallizer is Distance - the distance between the submerged nozzle and the inner arc side of the mold = 2mm, the specific water volume of the secondary cooling for continuous casting is 0.27L / kg, and the casting speed of the continuous casting slab is 0.6m / min.

[0026] The surface quality of th...

Embodiment 2

[0028] This embodiment provides a continuously cast billet with optimized surface quality. The continuous casting billet is composed of the following elements by weight percentage:

[0029]

[0030]

[0031] The balance is Fe and unavoidable impurities.

[0032] The cross-sectional size of the continuous casting billet is 280mm×325mm, and its manufacturing method is as follows:

[0033] The molten steel containing the elements in the above weight percentage is injected into the tundish through the ladle long nozzle, and then the molten steel in the tundish flows into the crystallizer through the submerged nozzle, and the distance between the submerged nozzle and the outer arc side of the crystallizer is Distance - the distance between the submerged nozzle and the inner arc side of the mold = 4mm, the specific water volume of the secondary cooling for continuous casting is 0.30L / kg, and the casting speed of the continuous casting slab is 0.65m / min.

[0034] The surface ...

Embodiment 3

[0036] This embodiment provides a continuously cast billet with optimized surface quality. The continuous casting billet is composed of the following elements by weight percentage:

[0037]

[0038] The balance is Fe and unavoidable impurities.

[0039] The cross-sectional size of the continuous casting billet is 290mm×335mm, and its manufacturing method is as follows:

[0040] The molten steel containing the elements in the above weight percentage is injected into the tundish through the ladle long nozzle, and then the molten steel in the tundish flows into the crystallizer through the submerged nozzle, and the distance between the submerged nozzle and the outer arc side of the crystallizer is Distance - the distance between the submerged nozzle and the inner arc side of the mold = 6mm, the specific water volume of the secondary cooling for continuous casting is 0.35L / kg, and the casting speed of the continuous casting slab is 0.73m / min.

[0041] The surface quality of t...

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Abstract

The invention relates to the field of metal machining, in particular to a manufacturing method of a continuous-cast steel billet with the optimized surface quality. The manufacturing method includes transferring molten steel with the specific elements into a middle ladle, and enabling the molten steel to flow into a crystallizer via a submerged nozzle, wherein a distance between the submerged nozzle and an outer arc side of the crystallizer is greater than that between the submerged nozzle and an inner arc side of the crystallizer. The manufacturing method has the advantage that the solidifying thickness of the molten steel in the crystallizer is evener through change on a nozzle position in the prior art, and the stress gradient of a billet shell caused by thermal contraction is decreased, so that longitudinal recesses or cracks formed in the surface of the billet shell are avoided.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a continuous casting billet with optimized surface quality and a manufacturing method thereof. Background technique [0002] Continuous casting, that is, continuous casting of steel, compared with the traditional die casting method, continuous casting technology has significant advantages such as greatly increasing the metal yield and saving energy. The process flow of continuous casting is: pour molten steel into the tundish, and the tundish distributes the molten steel to each crystallizer through the nozzle, and the mold cools down to make the casting form and solidify and crystallize rapidly. Under the joint action of the crystallization vibration device, the casting in the mold is pulled out, and the cast slab is forced to be uniformly cooled within the length interval from the mold outlet to the straightening machine, that is, the secondary cooling of continuous casting (abb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/04B22D11/103B22D11/18C22C38/02C22C38/04C22C38/42
CPCB22D11/04B22D11/103B22D11/18C22C38/02C22C38/04C22C38/42
Inventor 和红杰郭键叶凡新赵彦岭阎丽珍
Owner 吕梁建龙实业有限公司
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