Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode

Abstract

The invention discloses a method for producing a high-quality extra thick slab through a complete gas atomization secondary cooling mode, and belongs to the technical field of secondary cooling in steel making and continuous casting. The method comprises the following steps of: performing statistics and analysis on occurrence regularity of transverse cracks on the surface of the extra thick slab, and according to the quality status of the casting slab, determining secondary cooling areas where the complete gas atomization cooling mode is implemented are 10-13 regions which are 18.9-45.04m apart from a meniscus region; reducing the amount of secondary cooling water in the 10-13 regions and controlling the water reducing amount within 20-80%; and increasing secondary cooling wind pressure of the 10-13 areas and controlling the wind pressure increasing amount within 20-60%. The method disclosed by the invention has the advantages that the occurrence regularity of the transverse cracks on the surface of the extra thick slab is effectively reduced, and the rate of the finished steel slab is improved.

Description

technical field [0001] The invention belongs to the technical field of secondary cooling for steelmaking and continuous casting, and in particular provides a method for producing high-quality extra-thick slabs in the form of complete gas atomization secondary cooling. Production of high-quality extra-thick slabs (thickness specifications ≥ 400mm). Background technique [0002] Many literatures have elaborated on the research on the secondary cooling system of medium-thick slabs. The research shows that the weak cooling method used in the secondary cooling zone of the caster can effectively reduce the incidence of transverse cracks on the surface of the slab. Qinhuangdao Shouqin Metal Materials Co., Ltd. (hereinafter referred to as Shouqin Company) 3# caster is a continuous casting machine for extra-thick slabs capable of producing straight arcs with a thickness of more than 400mm, continuous bending and continuous straightening with a liquid core. Due to domestic Foreign ir...

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Problems solved by technology

Qinhuangdao Shouqin Metal Materials Co., Ltd. (hereinafter referred to as Shouqin Company) 3# caster is a continuous casting machine for extra-thick slabs capable of producing straight arcs with a thickness of more than 400mm, continuous bending and continuous straightening with a liquid core. Due to domestic Foreign iron and steel enterprises rarely use this type of continuous casting machine, so there are very few studies on the transverse cracks on the surface of extra-thick slabs, and only some foreign iron and steel enterprises have briefly introduced