Refining process of stainless steel alloy cored wire feeding wire

Alloy cored wire feeding technology is an out-of-furnace refining technology. It is made of alloy cored wire by coating various alloy powders with low carbon steel strips, and then passes through the slag layer at a certain speed by means of a wire feeder, and sends it into molten steel near the bottom of the ladle to deoxidize the molten steel , desulfurization, fine-tuning of alloy composition, denaturation of inclusions and other treatments, so as to achieve the purpose of improving the cleanliness of molten steel and the internal quantity of steel and reducing costs. Since the alloy additive is directly delivered to the depth of the molten steel, it can overcome the disadvantages of some alloy elements such as light specific gravity, low melting point, strong affinity with oxygen in the steel and difficult to add in the furnace or contact with slag, secondary oxidation burning, etc. factor. Therefore, this technology has developed rapidly in the metallurgical industry in recent years. But in the foundry industry, the application of wire feeding technology has just started.

Molten steel feeding line treatment can solve some problems that are difficult or not solved well enough by other processes at present, and it is simple and easy to operate and low in cost. Deoxidation is a work that must be carried out in the steelmaking process. Since the carbon content in molten steel is much lower than that of molten iron, the oxidation tendency of molten steel is much greater than that of molten iron. Even if non-oxidation steelmaking is used, it is impossible to obtain qualified steel castings without deoxidation operation. Therefore, it is a very important task to reduce the oxygen content in molten steel through deoxidation operation. In the foundry industry, more and more manufacturers are using induction furnaces to smelt cast steel due to the consideration of smelting cost and production efficiency. In the induction furnace, due to the low temperature of the slag phase, it is difficult to carry out deoxidation and refining through the slag phase. Therefore, the aluminum insertion method is usually used for deoxidation. However, its deoxidized products are difficult to float and discharge from the molten steel, and the residual alumina will affect the properties of the steel due to its unsatisfactory shape and distribution. In fact, deoxidizers such as calcium silicon and ferrosilicon used in diffusion deoxidation also have a high affinity with oxygen, and the deoxidation products are often composites of metal oxides and non-metal oxides, and most of them are relatively easy to float from molten steel. discharged. However, due to the small specific gravity of these deoxidizers, it is difficult to add them into the molten steel. The deoxidation of calcium silicon is also due to the low boiling point of calcium, so that calcium cannot play the role of deoxidation and change the properties of inclusions.

Wire feeding treatment of molten steel can make some deoxidizers with good deoxidation effect, but usually difficult to add, such as silicon calcium, etc., are sent into the depth of molten steel through cored wire feeding, where they are melted, reacted and absorbed inside the molten steel. This can greatly increase the absorption rate of calcium and improve the deoxidation effect. In general, the addition of deoxidizer can be reduced by using the feeding line to treat the deoxidizer, but the deoxidation is more thorough. There are more types of deoxidizers available.

During the addition of alloying elements, the alloying elements may interact with the air and the slag phase layer on the surface of the molten steel to reduce the amount of alloying elements actually added to the steel. Even the alloy elements that have entered the molten steel through the slag layer may be affected by their density, boiling point, etc., and some of them will escape from the molten steel quickly and cannot be effectively absorbed by the molten steel. Especially for some more active metal elements or elements that are easy to gasify. This not only increases the cost of alloying, but also tends to cause large fluctuations in the actual content of alloying elements in steel due to unstable absorption of alloying elements, thereby affecting the performance of alloy steel. Feeding wire technology can solve this problem. Through the wire feeding process, the alloying elements can be delivered directly to the depth of the molten steel without being affected by air and slag phase at all. Furthermore, because the alloying elements are melted and absorbed in the depth of the molten steel and under high pressure, the alloying elements and the molten steel have a larger contact area and a longer action time, not only the absorption rate of the alloying elements is high, but also the absorption is more stable, thus To ensure that the actual content of alloying elements in the steel is more accurate. Especially for the micro-adjustment of alloy element composition, the wire feeding process can be precisely controlled within the range close to the analysis error.

Anyang Lishi Industrial was established from 1999, factory covers an area of 45,000 square meters, with complete ferroalloys production equipments, and has our own laboratory and testing center to ensure quality.


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