Colorful continuous casting crystallizer covering slag for ultra-low carbon steel

Abstract

The invention discloses a colorful continuous casting crystallizer covering slag for ultra-low carbon steel. Materials of the colorful continuous casting crystallizer covering slag for the ultra-low carbon steel comprise fluorite powder 3% to 5%, industrial pure soda 3% to 5%, wollastonite in powder 44% to 55%, light roasting magnesite powder 5.5% to 7.5%, bauxite powder 2.5% to 4%, cryolite powder 7%, cement clinker 3.5% to 6%, lithium carbonate2%, iron oxide red 8% to 18%, a binding agent 1% to 2% and a water reducing agent 0.1% to 1%. The covering slag is good in spreadability in a crystallizer, active in surface of the slag, clear, regular and shallow in a casting blank and a vibration mark and free of the phenomena of slag adhesion and slag rolling. A surface of the casting blank is flat and smooth without abnormality. Passing rate of first products of the casting blanks is improved to over 99.9% from 86.2% in the prior art.

Description

Technical field [0001] The invention relates to a mold flux for steel continuous casting, in particular to a color mold flux for ultra-low carbon steel. Background technique [0002] At present, in the continuous casting production of low-carbon steel, especially ultra-low-carbon steel, the most prone problem is carbon increase. This problem has become the biggest problem in the production of ultra-low carbon steel continuous casting. In the past, our main idea to solve this type of problem was to reduce the free carbon content in the mold powder of continuous casting mold as much as possible, that is, to introduce carbon materials as little as possible or not to use carbon materials, but as long as carbon materials are used, molten steel may increase. Carbon, the use of carbonaceous materials leads to poor thermal insulation effect of the mold powder, and also accompanied by problems such as large slag sticks and crusts, so the overall effect is very unsatisfactory. US4038067 ...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of method is: the chemical activity of the added strong reducing metal powder is relatively large, and there are special requirements in the process of production, processing and transportation; in addition, the price is also relatively expensive

However, there are two main problems in the use of this kind of imported mold powder in China: (1) the cost is high; (2) it cannot be effectively combined with the specific production process conditions of each steel plant for separate design, and the pertinence is not strong

Images