How to maximize the effectiveness of the 5 functions of protecting slag
Release time:
2020-07-28
Continuous casting flux The application of continuous casting flux has greatly expanded and improved the varieties of steel used in continuous casting, the types of continuous casting sections, the quality of continuous casting billets, and the continuous casting production rate, and has become an indispensable metallurgical auxiliary material.
will protective slag Adding protective slag to the surface of the mold steel, it gradually heats up, sinters and melts under the action of the heat released by the molten steel, forming a double-layer, three-layer or multi-layer slag layer structure on the surface of the mold steel.
In order to fully utilize Continuous casting flux five major functions, it is necessary to add to protective slag form “ three-layer structure ” 。Forming “ three-layer structure ” The secret to forming is to control the melting rate of the mold protective slag That is to say, the protective casting slag added to the steel surface should melt gradually instead of immediately dissolving in the liquid. For this reason, carbon particles are usually added to the protective slag as a regulator of the melting rate.
The speed of controlling the melting speed of carbon particles depends on the type and quantity of carbon particles added. Carbon is a high-temperature resistant material. Very fine carbon powder is adsorbed around the slag particles, separating the slag particles from each other, hindering the contact and melting between the slag materials, and slowing down the melting speed. If insufficient carbon powder is added, protective slag The temperature of the slag layer has not yet reached the sintering temperature of the slag, the carbon particles are burned out, the sintering layer develops, the melting speed is too fast, and the liquid slag layer is too thick. If too much carbon powder is added, some carbon particles will still exist after the slag is completely melted, which will cause the sintering layer to shrink and make the sintering layer too thin. When the amount of carbon powder added is moderate, some carbon particles in the sintering layer are burned out, and the remaining slag is effectively controlled by the carbon particles, so as to obtain a sintering layer and a liquid slag layer with an appropriate thickness.
The carbon material is graphite. The carbon black graphite particles are coarser, with a particle size of 60 ~ 80 microns, and the separation and blocking properties are poor, but the initial oxidation temperature is high (approximately 560 ), and the oxidation rate is slow, and the ability to control the melting rate in the high-temperature zone is strong. Carbon black has an amorphous structure, small particles ( 0.06 ~ 0.10 microns), strong separation and blocking ability, and low initial oxidation temperature ( 500 ), and fast oxidation rate. Therefore, carbon black has a strong ability to control the melting rate in the low slag layer temperature zone, while its control efficiency is low in the high temperature zone, and even if the amount is increased, the improvement effect is limited.
The amount of carbon powder added is generally 4 ~ 7 %.
For more information on protective slag questions, please contact Luoyang Turner High Temperature Instrument Co., Ltd.
Related Blog
Scan
Luoyang Turner High Temperature Instrument Co., Ltd.
+86-400-880-7095
Sales (same as WeChat):18695992058
Contact:+86-379-69755886
Address: South Section of Shuangxiang Road, Luoxin Industrial Cluster, Luoyang City, Henan Province
Email:tnkinstrument@163.com
Copyright © Luoyang Tainake High-Temperature Instrument Equipment Co., Ltd. IPV6