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Protective cinder for special-shaped blank continuous casting

A special-shaped billet continuous casting and mold slag technology, which is applied in the field of metal continuous casting, can solve the problems affecting the lubricating and filling properties of mold slag, the adhesion of the billet shell and the copper wall of the mold, and the viscosity of the mold slag. Low price and improved surface quality

Inactive Publication Date: 2007-10-17
MAANSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high viscosity of the mold slag, the slag layer is too viscous during use, which affects the lubrication and filling properties of the mold slag, and is prone to adhesion between the slab shell and the copper wall of the crystallizer, steel breakout accidents, and a large number of cracks on the surface of the slab, which seriously affects product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: According to the requirements of the components and particle sizes of the chemical components listed in Table 1, the raw materials are pre-melted and sintered, mixed, crushed, granulated or not, dried, weighed, and bagged. After testing, the melting point The viscosity at 1133°C and (1300°C) 4.17Pa.s are listed in Table 1.

[0010] Carried out in the same way, its chemical composition and measured melting point (° C.), viscosity (1300° C.) Pa.s are listed in Table 1.

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PUM

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Abstract

The invention belongs to metal continuous casting, in particular relates to protecting slag used for pouring medium carbon steel in a shaped blank continuous casting crystallizer. The protecting slag of the invention has the following compositions, based on weight percent: CaO of 31-37%, SiO2 of 30-37%, Al2O3 of 4.5-10.5%, F- of 2.5-6.5%, R2O(Na2O+K2O) of 2.5-8.5%, and fixation C of 4-7%. Physical property of the protecting slag is in the melting point of 1100-1170 DEG C. and viscosity (1300 DEG C.) of 0.3-0.5Pa.s. The advantages of the invention are of: good physical property of the protecting slag, e.g. low melting point and low viscosity; fine lubrication and filling performance of the protecting slag to satisfy process requirements for continuously casting the shaped blank; reducing surface longitudinal crack of the casting blank greatly, increasing surface quality of the shaped blank, remarkably reducing rejection ratio, with low cost, thus the invention can substitute for imported protecting slag.

Description

technical field [0001] The invention belongs to the continuous casting of metals, and in particular relates to mold slag for pouring medium carbon steel in a continuous casting crystallizer of a profiled billet. Background technique [0002] In the process of continuous pouring of molten steel, mold slag is added on the surface of molten steel in the mold to fill the gap between the solidified billet shell and the copper wall of the mold to improve heat transfer and prevent bonding; isolate air to prevent oxidation of molten steel and reduce heat Dissipate; absorb inclusions in steel. Due to the complex cross-sectional shape of the continuous casting profile billet, the requirements for the mold powder are more stringent, and the imported expensive mold powder is used in the early stage of production. Its chemical composition is: CaO 35-39%, SiO 2 10-15%, Al 2 o 3 10-15%, F - 2-5%, R 2 O(Na 2 O+K 2 O) 2-6%, fixed C 3-5%, its physical properties: melting point 1180-1...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 杜松林乌力平许健李建中汤寅波孙维黄社清汪开忠李书成李伟锋谢龙山谢玉满黄占基谢桂忠夏新章
Owner MAANSHAN IRON & STEEL CO LTD
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