Start powder for stainless steel continuous casting and application thereof

Abstract

The invention discloses start powder for stainless steel continuous casting and an application thereof, and belongs to the technical field of steelmaking auxiliary materials. The start powder is prepared from the following raw materials of, in parts by weight, 20-30 parts of fluorite, 15-30 parts of cement clinker, 15-22 parts of glass powder, 9-20 parts of bentonite, 2-7 parts of white alkali, 3-6 parts of sodium nitrate and 10-20 parts of a heating material, and the heating material comprises a mixture of scrap iron and ferrosilicon alloy and does not contain coke or coke powder. The start powder for stainless steel continuous casting effectively avoids the problem of recarburization inevitably existing when common start powder uses coke or coke powder as a heating material, the start powder provided can meet the production requirements of stainless steel continuous casting, and on the premise of ensuring the quality of a first billet, the quality defects such as slag inclusion and recarburization of the first billet are reduced, and the stainless steel continuous casting comprehensive yield is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking auxiliary materials, in particular to a casting slag for continuous casting of stainless steel and its application. Background technique [0002] In the continuous casting production process, due to the manual control after the pouring, the liquid steel level fluctuates greatly, the sedation time is long, and the submerged nozzle is easy to freeze steel, etc., resulting in a high slag inclusion rate and serious defects in the first billet after the pouring, making the The secondary cutting and scrapping of the first billet has a large amount of scrap, which has a great impact on the cost of the steel mill. [0003] For stainless steel continuous casting, conventional casting slag is used, and the secondary cutting scrap caused by slag inclusion defects in the head billet accounts for more than 80% of the stainless steel continuous casting waste. The scrap rate of stainless steel remains high,...

AI Technical Summary

Problems solved by technology

In order to solve the problem of high scrap rate of slag inclusions in stainless steel continuous casting billets, the most common method currently used by most steel enterprises is to increase the length of cutting heads for casting, so that a large number of slag-included billets will be counted as waste products. The increase in yield has a greater impact

[0004] It is known that the casting speed is low at the beginning of continuous casting, and the molten steel stays in the crystallizer for a long time. In addition, the temperature of the entire process section is relatively low at the beginning of casting, and most of the heat needs to be absorbed, resulting in the molten steel in the mold The mold slag added on the surface melts slowly, which cannot meet the needs of normal casting, and sometimes even cold steel phenomenon occurs, which directly affects the quality of the cast slab head billet

However, although the conventional pouring slag can also generate heat and form slag quickly, there are problems such as violent tumbling of the molten steel surface and carburization of the molten steel during use.