Special continuous casting crystallizer casting powder for ESP low carbon

Abstract

The invention relates to special continuous casting crystallizer casting powder for ESP low carbon, and belongs to the field of metallurgy accessories. The casting powder comprises chemical componentsincluding, by weight, 28-33 parts of CaO, 22-29 parts of SiO2, 4.5-7.5 parts of MgO, 4.5-7 parts of Al2O3, 7-10 parts of Na2O, 8-11 parts of F, 0.3-1.5 parts of B2O3, 0.5-1 part of Li2O and 1-3.5 parts of C. The casting powder has the low melting temperature, low viscosity and high melting speed, the casting powder can be rapidly consumed when the continuous casting pulling rate is 5-7 m / min, andaccordingly heat transfer and lubricating performance between a continuous casting blank shell and a crystallizer copper plate are guaranteed.

Description

technical field [0001] The invention relates to the field of metallurgical auxiliary materials, and in particular to a mold slag specially used for ESP low-carbon continuous casting molds. Background technique [0002] Since 2008, domestic steel production capacity has been overcapacitated, but steel costs have remained high. Domestic steel companies have taken measures to improve their operations, such as tapping potential by benchmarking, reducing costs and increasing efficiency, and developing high value-added varieties of steel. [0003] At present, the production method generally adopted by most domestic steel mills is to cast high-quality micro-alloy molten steel with continuous casting machines, and then cool the slabs for secondary heating and then roll them. This scheme is generally feasible, but Production costs are higher. This requires a large amount of alloying elements due to the additional cooling. [0004] Over the years, many casting and rolling workshops ...

AI Technical Summary

Problems solved by technology

[0009] At present, the mold flux for medium-carbon steel used in casting ESP low-carbon steel cannot satisfy the lubrication effect and heat transfer capacity, which restricts the improvement of casting speed and also affects the surface quality of the final slab, such as depressions, etc.