Speical superthin slab continuous cast crystallizer protecing slay and production process thereof

Abstract

The invention relates to an ultrathin-slab special continuous-casting crystallizer protective residue as well as its producing technique. It is composed of premelting matiral (substrate), flux material and carbonaceous material, where the flux material includes Li2CO3, K2CO3, MnCO3, MgCO3, etc; its producing technique: gasifying all the materials into the storage bin, then making microcomputer batching 6T per work according to specific project, then blending in blender, detecting semi-finished products, when up to standard, dry-milling in ball mill, finely milling in water mill and slurrying, drawing to spray to make particles and then packaging the qualified products and put them in storage. It has a few residue bars and active reaction in the crystallizer.

Description

Technical field: [0001] The invention relates to a metallurgical auxiliary material product for ultra-thin slab continuous casting in the field of metallurgy, and is a special pre-melted crystalline mold flux technology suitable for ultra-thin slab continuous casting (CSP, ISP). Background technique: [0002] Ultra-thin slab continuous casting and rolling is characterized by short production process, close connection between continuous casting and steel rolling process, maximum energy saving, low environmental pollution, high metal yield, short period from molten steel to finished product, and technical and economic benefits. Significant and other advantages, rapidly brewing a new technological change in the field of metallurgy in the world. [0003] It has been nearly five years since the joint introduction of CSP production technology by my country's Handan Iron and Steel, Zhuzhou Iron and Steel, and Baotou Steel in 1998, but the advantages of CSP have not been truly refle...

AI Technical Summary

Problems solved by technology

Around 2000, some domestic mold slag manufacturers began to research thin slab mold slag and applied for patents. Although the cost of mold slag for steel mills has been reduced, the quality of cast slabs (crack rate, inclusion rate greatly increased) but getting worse

In practical application, there is another extreme, that is, the process is relatively smooth; but the disadvantages are: 1. During the production process, the heat flow of the mold is too large, and the crack rate on the surface of the slab increases; 2. The separation of slag and steel is difficult, resulting in all There are a large number of strip-shaped or sheet-shaped inclusions on the surface of the rolled sheet and it is scrapped

while higher Na 2 O and CaF 2 respectively will lead to high melting nepheline (Na 2 O.Al 2 o 3 .2SiO2 2 ) and gunite (3CaO.2SiO 2 .CaF 2 ) precipitation, the crystal grains of this kind are relatively coarse and the melting point is high, which will inevitably lead to poor lubrication performance of the slab in the crystallizer, and easily cause bonding breakout; at the same time, due to the presence of Na 2 CO 3 Such materials are surface active substances, a large amount of which will reduce the interfacial tension of steel slag and cause sticky slag; 2 Class O material