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High crystallinity and high lubricity mold powder for continuous casting

A mold powder, high crystallinity technology, applied in the production of high-speed slab continuous casting, mold powder for high crystallinity and high lubricity continuous casting, mold powder, can solve the limitation of continuous casting ladle Higher casting speed of crystal steel slabs, etc., to achieve lower melting point and transition temperature, improve cooling efficiency, and improve the effect of casting slab lubrication

Active Publication Date: 2014-10-08
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

However, it does not fundamentally solve the contradiction between mold slag lubrication and heat transfer, which is especially obvious in high-speed continuous casting of peritectic steel slabs
Therefore, the characteristics of traditional pure high-crystalline mold flux limit the high casting speed of continuous casting peritectic steel slabs

Method used

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Embodiment Construction

[0014] The invention provides a kind of mold powder for steel slab continuous casting mold suitable for peritectic reaction in the solidification process. The technical problem solved by the mold mold powder in the invention is: under the condition of high casting speed, coordinate the mold powder The contradiction between controlling heat transfer and lubricating the cast slab, so that mold slag can play the advantage of controlling heat transfer at the meniscus and ensure lubrication; in the middle and lower parts of the crystallizer, the liquid slag film can be maintained at a certain thickness to improve heat transfer conditions and increase The thickness of the shell of the crystallizer can be adjusted to coordinate the ability of mold slag to control heat transfer and lubricate the slab, reduce or avoid the occurrence of longitudinal cracks and bonding, and improve the surface and subcutaneous quality of the slab. And it can reduce abnormal conditions such as bulging and ...

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Abstract

The invention discloses crystallizer casting powder for high-crystallinity high-lubricity continuous casting. The crystallizer casting powder comprises, by weight, 40%<CaO<46.5%, 22%<SiO2<30%, 6.8%<F-<7.8%, a compound formed by one or two or three of ZnO, B2O3 and BaO, 7%<Li2O+Na2O<15%, Al2O3<3%, MgO<3%, Fe2O3<2%, 2%<C<15% and the balance impurities, wherein 4%<the compound<26%, ZnO<8%, B2O3<8%, and BaO<10%. The crystallizer casting powder effectively coordinates contradiction between lubricating of casting blanks by using the casting powder and controlling of heat transfer in a continuous casting process of peritectic steel plates. The casting powder improves casting blank lubrication, simultaneously guarantees the capacity of the casting powder of evenly transferring heat, is favorable for improving casting blank quality in the continuous casting process of the peritectic steel, balances heat flow of the upper portion and the lower middle portion of the crystallizer, increases the thickness of blank casings when being discharged from the crystallizer, and can improve pulling speed and production efficiency.

Description

technical field [0001] The present invention relates to the improvement of mold powder technology, in particular to a mold powder with high crystallinity and high lubricity for continuous casting, which is suitable for high casting speed of steel grades that are sensitive to cracks and prone to longitudinal cracks with peritectic reaction during solidification The slab continuous casting production belongs to the technical field of continuous casting production. Background technique [0002] In the continuous casting production process of peritectic steel slabs, due to the occurrence of peritectic reaction during the solidification process of molten steel, the primary slab shell shrinks greatly, and the growth is not uniform, and longitudinal cracks are likely to occur due to stress concentration. Therefore, the mold slag film is required to have a strong ability to control heat transfer near the meniscus, so as to control the heat transfer from the slab to the mold, so as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/07
Inventor 王谦何生平龙潇朱礼龙鲁永剑杨颖
Owner CHONGQING UNIV
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