A kind of smelting process of molten alloy steel for preparing iron-based amorphous broadband

Abstract

The invention belongs to the technical field of an alloy smelting process, and discloses a smelting process of alloy molten steel for preparing an iron-based amorphous broadband. The process sequentially comprises the following steps: I. preparing materials; II. arranging furnace charge; III. smelting and the like. In the process, only industrial pure iron, ferroboron and metallic silicon are added, low-aluminum ferroboron is selected as the ferroboron, the metallic silicon is finally added, only once smelting is carried out, the smelting temperature is low, the links of high-temperature decarbonization, mixing of a reductant and an additive, slagging and the like can be omitted, the smelting time can be shortened, the comprehensive energy consumption for smelting can be reduced, the smelting process makes contribution to the reduction of impurities, the burning loss of Si, B and the like can be maximally reduced, and the occurrence of plugging in band spraying, red steel spraying, scratch on the surface of bands, and other bad phenomena can be decreased.

Description

technical field [0001] The invention belongs to the technical field of alloy smelting technology, and relates to a smelting technology of molten alloy steel for preparing iron-based amorphous broadband, which is suitable for smelting molten steel of FeSiB series amorphous alloy strips with a melting point lower than 1400°C. Background technique [0002] With the continuous development of the amorphous alloy strip industry, higher and higher requirements are put forward for the composition and purity control of the alloy steel liquid used for the preparation of iron-based amorphous alloys. From the point of view of the traditional amorphous master alloy smelting process, high-purity raw materials are a prerequisite for the preparation of amorphous alloy strips with excellent comprehensive properties. [0003] Chinese Patent Publication No. CN1105393A proposes a method for directly smelting iron-based amorphous master alloys in a DC plasma furnace, using boron-rich magnesium o...

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Problems solved by technology

[0003] Chinese Patent Publication No. CN1105393A proposes a method for directly smelting iron-based amorphous master alloys in a DC plasma furnace, using boron-rich magnesium ore, boron-rich slag or directly reduced boronite as raw materials. The molten steel is subjected to high-temperature decarburization treatment, and the smelting temperature needs to be >1600°C. Not only is the loss of Si and B serious, making it difficult to control the composition; it is also difficult to remove impurities, especially the content of the impurity Al can only be controlled within the range of 0.005-0.08%; The lining erosion is accelerated at high temperature, and the service life is greatly reduced.

It brings great difficulties to direct spraying and continuous production of iron-based amorphous alloy strips

[0004] Chinese Patent Publication No. CN101580903A proposes a method for smelting iron-based amorphous master alloys. Although the smelting temperature is lower than that of the traditional process, the smelting temperature is still between 1450 and 1550°C, which will also burn elements such as Si and B. Serious damage; and the raw materials used are very complex and various, resulting in complex acidity and alkalinity of the slag, reducing the life of the lining; in the case of boric acid dehydration, the hydrogen content of molten steel increases, resulting in hydrogen embrittlement of the alloy strip and reduced toughness

However, the smelted master alloy is FeCuNbSiB series. To produce amorphous strips, an additional half of pure iron needs to be added for secondary smelting of the master alloy of this composition, and the overall energy consumption is still relatively large; The elements Si, Cu and the main elements of industrial pure iron and ferroboron are put together in the furnace for smelting. The order and method of discharging materials are unreasonable, which increases the burning loss of Si and Cu, and also makes more oxide slag, which increases the pollution of molten steel; The smelting does not specify whether bottom blowing argon is used, nor does it specify the composition of the master alloy after smelting. The content of Al and Ti in the master alloy smelted by this method must be greater than 0.005wt%, the content of C is greater than 0.05wt%, and the content of P is greater than 0.02wt%. , The S content is greater than 0.01wt%, which is not suitable for mass production of amorphous strips with a width greater than 50mm; and the amorphous strips produced by this series of alloys are brittle and often broken

[0006] The smelting temperature in the smelting process described in the above-mentioned Chinese Patent Publication Nos. CN1105393A and CN101580903A is high, so that the energy consumption per unit mass of smelting is large; and the selection of raw materials is very complicated, the composition control and the preparation of the strip are difficult, resulting in the formation of the iron-based alloy strip The rate is low, and there are many defective products, especially for mass production of iron-based amorphous broadband.

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