Alloy Cored Wire Used in the Steel Industry

Alloy Cored Wire Used in the Steel Industry

Alloy cored wire feeding technology is a refining technology outside the furnace. It coats various alloy powders with low carbon steel strips to make alloy cored wires, and then uses a wire feeder to pass through the slag layer at a certain speed and feed it into the molten steel near the bottom of the ladle to deoxidize the molten steel, desulfurization, alloy composition fine-tuning, inclusion denaturation and other treatments to achieve the purpose of improving the cleanliness of molten steel and the inherent quality of steel and reducing costs.

ferro titanium cored wire

Since the alloy additives are delivered directly to the depth of the molten steel, it can overcome the disadvantages of certain alloy elements such as their light specific gravity, low melting point, strong affinity with oxygen in the steel, making them difficult to add in the furnace, contact with slag, and secondary oxidation burnout. 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 begun.

Alloy Cored Wire Types

There are many kinds of alloy cored wire, and the most commonly used cored wire types are as follows.

  • Nitrided Ferro Chrome Cored Wire
  • Nitrided Manganese Cored Wire
  • Sulfur Cored Wire
  • Silico Manganese Cored Wire
  • Ferro Boron Cored Wire
  • Ferro Manganese Cored Wire
  • Magnesium Cored Wire
  • Silicon Barium Cored Wire
  • Ferro Vanadium Cored Wire

The Advantage of Alloy Cored Wire

The molten steel wire feeding process can solve some problems that are difficult to solve or not solved well enough by other current processes, and it is simple, easy and low-cost. Deoxidation is a necessary task 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 the non-oxidation method is used to make steel, it is impossible to obtain qualified steel castings without deoxidation. 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 now using induction electric furnaces to smelt cast steel due to considerations of melting costs and production efficiency. In induction electric furnaces, due to the low temperature of the slag phase, deoxidation and refining through the slag phase are difficult to carry out. Therefore, aluminum insertion method is usually used for deoxidation. However, its deoxidation products are difficult to float up and discharge from the molten steel, and the remaining alumina will affect the performance of the steel due to its unsatisfactory shape and distribution.

In fact, deoxidizers such as calcium silicon and ferrosilicon used for diffusion deoxidation also have a high affinity with oxygen. Their deoxidation products are often complexes composed of metal oxides and non-metal oxides. Most of them are relatively easy to float from the molten steel. discharged. However, due to the small specific gravity of these deoxidizers, it is difficult to add them to the inside of the molten steel. Calcium silicon deoxidation also has a very low boiling point, making it impossible for calcium to deoxidize and change the properties of inclusions.

The wire feeding treatment of molten steel can send some deoxidizers, such as calcium silicate, which have good deoxidation effects but are usually difficult to add, into the depth of the molten steel through the cored wire feeding wire, where they are melted, reacted and absorbed inside the molten steel. This can greatly improve the absorption rate of calcium and improve the deoxidation effect. Generally speaking, the addition amount of deoxidizer can be reduced and the deoxidation will be more complete when using feed line treatment. There are also more types of deoxidizers available.

During the addition process of alloying elements, the alloying elements may interact with the air and the slag phase layer on the surface of the molten steel, thereby reducing the amount of alloying elements actually added to the steel. Even the alloy elements that have passed through the slag layer and entered the molten steel may be affected by their density, boiling point, etc. and some of them may escape from the molten steel quickly and cannot be effectively absorbed by the molten steel.

This is especially true for some more active metallic elements or elements that are easily vaporized. This not only increases the cost of alloying, but is also prone to large fluctuations in the actual content of alloy elements in steel due to unstable absorption of alloy elements, thus affecting the performance of alloy steel. The wire feeding process can solve this problem. Through the wire feeding process, the alloying elements can be directly delivered to the depth of the molten steel without being affected by the air and slag phase.

Moreover, because the alloying elements are melted and absorbed deep in the molten steel and under higher pressure, the alloying elements have a larger contact area and longer interaction time with the molten steel. Not only the absorption rate of the alloying elements is high, but also the absorption is more stable, thus Ensure that the actual alloying element content in the steel is more accurate. Especially for micro-adjustment of alloy element composition, the wire feeding process can be accurately controlled within a range close to the analytical error.

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