Low-aluminum silicon-barium-calcium alloy and production process thereof

Abstract

The invention relates to a low-aluminum silicon-barium-calcium alloy and a production process thereof, relating to the field of steel-making deoxidizing agents. At present, silicon-barium alloy, silicon-calcium alloy and ferrosilicon alloy are commonly and respectively added during steel making. As a result, high-content of impurities such as sulfur, phosphorus, and the like exists in a steel material, and the aluminum content is also over 2 percent, so that the quality of the steel material is severely affected; besides, the production cost is high, the process is complex, and the labor intensity is great. The invention adopts a compound refining method to produce the low-aluminum silicon-barium-calcium alloy, comprising the steps of adding and melting scrap iron, melting the silicon-barium alloy till ebullition, adding silicon-calcium alloy, adding dealuminzation powder, keeping the ebullition for 10-20 min, and finally casting and forming to obtain a finished deoxidizing agent. The invention has the advantages of low content of harmful elements, few impurities, capability of meeting the requirements on special good-quality steel materials, low cost, simple process and low construction investment.

Description

technical field [0001] The invention relates to the field of steelmaking deoxidizers, in particular to composite deoxidizers. Background technique [0002] With the rapid development of the national economy, the smelting process of the iron and steel industry has also undergone fundamental changes. The original deoxidation materials can no longer meet the requirements of deoxidation efficiency, steel cleanliness, smooth production process, and cost reduction. Therefore, the new deoxidation The development of the deoxidizer is imminent, and the present invention aims to develop a novel high-efficiency composite deoxidizer to save energy, reduce consumption and reduce costs. [0003] In the process of steelmaking, oxygen can oxidize molten steel into FeO, and FeO reacts with carbon in molten steel to generate CO bubbles, which form pores in steel after cooling. Precipitation at the grain boundaries of the steel reduces the mechanical properties of the steel, so a deoxidizer m...

AI Technical Summary

Problems solved by technology

Although the above three methods have their own advantages and disadvantages, the products produced have high impurity content and harmful components (the aluminum content is generally above 2%, the S content is 0.055%, the P content is greater than 0.045%, and the C content is greater than 0.3%)

[0006] In short, deoxidizers must be added during steelmaking, but the current production process of deoxidizers is complex, labor-intensive, high production cost, and high in impurity content. It is necessary to find a silicon smelting method with low impurity content, low cost and relatively simple process. A new approach to barium-calcium alloys