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Stainless steel alloy cored wire feeding line refining process

2016-12-15 12:16:31

Alloy cored wire feeding technology is a kind of furnace refining technology. It is all kinds of alloy powder made by low carbon steel coated alloy cored wire, and the wire feeding machine to a certain speed through the slag layer, the steel ladle into the water near the bottom, for deoxidation and desulfurization of alloy composition, trimming, inclusion modification treatment on liquid steel, so as to improve the internal volume of molten steel cleaning and the steel and reduce the cost. Because the alloy additives are sent directly to the molten steel, which can overcome some alloy elements of light weight, low melting point, and oxygen in steel affinity is strong and not easy to join in the furnace and the slag or contact, two oxidation loss and other unfavorable factors. So in recent years, this technology has been developed rapidly in the metallurgical industry. But in the foundry industry, the application of wire feeding technology has just started.

Steel liquid feed processing can solve some problems that can not be solved by other techniques, and is simple and easy to operate, and the cost is low. The process of steel making is a necessary work in the process of steel making. Because the carbon content of the steel is much lower than that of the molten iron, the oxidation tendency of the molten steel is much more than that of the molten iron. Even if the use of non - oxidation process, such as not to carry out the operation, it is not possible to get qualified cast steel. So it is a very important work to reduce the oxygen content in the steel by means of the operation. In the foundry industry, now more and more manufacturers for smelting cost and production efficiency considerations in the induction furnace melting cast steel, in induction furnace slag phase due to low temperature, phase deoxidation and refining slag through the difficult. So it is usually carried out by using aluminum insertion method. However, it is difficult to discharge from the steel liquid, and the residual aluminum oxide can affect the properties of steel because of its shape and distribution. In fact, the diffusion deoxidation of ferrosilicon, calcium deoxidizer and oxygen also have high affinity, the deoxidation product is often complex metal oxides and non metal oxide, most of them are easily discharged from floating in liquid steel. But because the deoxidizing agent proportion is small and difficult to add to the liquid steel, deoxidation for calcium calcium has a low boiling point and calcium can not play the role of deoxidation and inclusion property change.

Wire feeding process of molten steel can be some good deoxidizing effect, but often difficult to join the deoxidizer, such as calcium by cored wire feeding into the molten steel, in the absorption of liquid steel melting, reaction. This can greatly improve the absorption rate of calcium, improve the effect of oxygen. In general, the amount of the addition of the feed treated with the feed line can be reduced and the oxygen is more completely. The role of a variety of types of oxygen species is also more.

Alloying elements may interact with the slag layer on air and steel surface to reduce the amount of alloying elements in the steel. Even if it has passed through the slag layer into the liquid steel alloy elements, may also be affected by its density, boiling point and other parts of the impact of a very fast from the liquid steel, can not be effectively absorbed by the steel. Especially for some of the more active metal elements or easy to gasification of the elements is even more so. This not only increases the cost, but also is easy to appear because of the alloy element absorbs the instability of the alloy element in the actual content of the actual content of fluctuations, thereby affecting the performance of the alloy steel. Wire feeding process can solve this problem. The alloy element can be directly delivered to the molten steel in the depth of the steel liquid through the feed line processing, and the influence of the air and the slag phase can not be completely affected. The alloy elements in the molten steel and in high pressure melting absorption, effect of alloy elements have larger contact area and longer time of liquid steel and alloy elements, not only the high absorption rate, absorption and more stable, so as to ensure the steel alloy element content the more accurate. Especially for the micro adjustment of alloying elements, the feeding process can be controlled in the range of close analysis error.

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