Narrow-face copper plate taper back draft process for continuous casting sheet billet chamfering crystallizer

Abstract

The invention provides a narrow-face copper plate taper back draft process for a continuous casting sheet billet chamfering crystallizer and belongs to the technical field of steelmaking-continuous casting. The length of a contour line of an applicative chamfer ranges from 35 mm to 70 mm and the applicative continuous casting billet normal work pulling speed ranges from 0.65 m / min to 1.50 m / min. When low-carbon steel with the [C] content lower than or equal to 0.08% is poured through the continuous casting sheet billet chamfering crystallizer, the narrow-face taper back draft of a copper plate ranges from 1.1% / m to 1.5% / m; when medium-carbon steel with the [C] content higher than or equal to 0.09% and lower than or equal to 0.2% is poured through the continuous casting sheet billet chamfering crystallizer, the back draft of the copper plate ranges from 1.2% / m to 1.6% / m; when high-carbon steel with the [C] content higher than 0.2% is poured through the continuous casting sheet billet chamfering crystallizer, the narrow-face taper back draft of the copper plate ranges from 1.1% / m to 1.45% / m. The narrow-face copper plate taper back draft process has the advantages that the reasonable chamfer copper plate back draft is adopted, so that great significance in guaranteeing even and stable growth of a billet shell in a chamfered position and avoiding generation of transverse cracks on the surface of a continuous casting billet is achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular provides a continuous casting slab chamfering crystallizer narrow surface copper plate reverse taper technology. Background technique [0002] The problem of corner and transverse crack defects in continuous casting slabs has been a difficult problem that has plagued metallurgical workers for a long time. A chamfered crystallizer designed to eliminate transverse cracks in slab corners has been successfully developed, but this technology has only been maturely applied in Shougang. [0003] The slab chamfering crystallizer technology has been developed and developed in many world-leading iron and steel enterprises, such as voestalpine Linz Steel Works, Japan's Nippon Steel Corporation and domestic Baosteel and other enterprises, but these enterprises have not carried out large-scale industrial applications. Among them, although Nippon Steel and VAI Linz Ir...

AI Technical Summary

Problems solved by technology

In the application process of the chamfering mold, the narrow face reverse taper process was set according to the copper plate of the right angle mold in the early stage. Usually, the reverse taper is 0.9-1.1% / m, but it is found that a large number of corner longitudinal cracks appear in the chamfered billet, which seriously affects the quality of the billet.