一种连铸板坯表面凹陷缺陷的控制方法

By controlling the longitudinal and transverse depressions separately, and using specific mold protective slag and vibration parameters, the problem of depression defects in continuously cast slabs was solved, improving product quality and production efficiency.

CN115722641BActive Publication Date: 2026-07-17HBIS LAOTING STEEL CO LTD +2

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HBIS LAOTING STEEL CO LTD
Filing Date
2022-11-04
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies have failed to effectively distinguish and control transverse and longitudinal depressions in continuously cast slabs, resulting in depression defects that seriously affect product quality and production efficiency.

Method used

By controlling the longitudinal and transverse depressions separately, using different mold protective slags and vibration parameters, and adjusting the inverted taper of the narrow face of the mold, the cooling intensity and the composition of the protective slag, the uniformity of the initial billet shell thickness and the resistance to deformation are ensured.

Benefits of technology

It effectively controlled the transverse and longitudinal depressions of the continuously cast slab, improved product quality, reduced production costs, and ensured smooth production and high metal yield.

✦ Generated by Eureka AI based on patent content.

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Abstract

本发明公开了一种连铸板坯表面凹陷缺陷的控制方法,连铸过程中对连铸板坯的纵向凹陷和横向凹陷分别进行控制;所述纵向凹陷的控制:结晶器窄面倒锥度设置为1.10~1.2%;采用低粘度高碱度结晶器保护渣,粘度η1300℃≤0.15Pa·S、碱度R≥1.25;结晶器弱冷,结晶器窄面 / 宽面热流比=0.9±0.1,二冷水弱冷;所述横向凹陷的控制:采用高粘度低碱度结晶器保护渣,高粘度η1300℃≥0.25Pa·S、碱度R=1.0~1.10;采用高振幅低频率非正弦结晶器振动,负滑脱时间tNF=0.12~0.15s、振幅h=6~12mm、频率f=110~160cpm;保护渣中,Na2O+CaF含量≤10wt%,Li2O+MgO+BaO+B2O3含量≥6wt%。本方法有效控制了连铸板坯的横向凹陷与纵向凹陷缺陷,提高了产品质量。
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