Cored Wire is used to improve the quality of steel and iron. It can modify the shape, size and distribution of oxide and sulfide inclusions improving fluidity, machinability, ductility and impact strength of the steel.
It can also be used in apricot gold, desulfurization and creeping treatment of cast iron. The feeding position should be properly selected. Reasonably adjusting the feed speed can increase the calcium yield.
The encapsulated pure metal calcium wire in steel sheath called cored wire is used to perform the tasks of deoxidation, desulphurization and inclusion modification in secondary steel refining process through wire injection. The advantage of this method is that it can provide high recovery of Ca in the molten steel and improve the quality of the steel product. However, the selection of optimum alloy addition parameters is still a challenge.
Silicon calcium alloy has a strong affinity for oxygen and also possesses good compatibility with aluminium, nitrogen, sulphur and sulfur, making it an ideal compound deoxidizer and desulfurizer. In addition, calcium silicon can control the shape and size of oxide and sulfide inclusions, improving fluidity and machinability. It can also eliminate tumor in ladle water outlet of aluminum as the final deoxidizer and clogging of the nozzle in tundish of continuous casting steel and ironmaking. Besides, it can enhance the sweetening effect and improve the utilization of calcium.
In smelting industry, calcium silicon cored wire is a mature refining technology and it has many functions. It is mainly used in steelmaking for deoxidation, desulfurization and inclusion denaturation of steel as well as for calcium treatment of continuous casting steel.
The method of introducing calcium in cored wire involves injecting a metallic calcium-aluminum alloy into molten steel. However, this approach suffers from some disadvantages compared to the use of pure calcium. For example, it has a lower vapor pressure than pure calcium and thus requires immersion depths in excess of those available in the typical steelmaking ladle.
Moreover, this method can also produce undesirable calcium spinels which are not only harmful to nozzles but may even lead to a collapse of the ladle. The present invention overcomes this problem by using a solid metal calcium-aluminum cored wire with a passivation treatment to prevent the formation of these undesirable spinels. The resulting calcium-aluminum cored wire can be stored for long periods of time without losing its antioxidation properties.
Calcium silicon is widely used as composite deoxidizer and desulfurizer in steel industry. Due to its high affinity for oxygen and calcium for sulphur and nitrogen, it can effectively float out the impurities in the liquid steel and improve the performance of the steel, such as fluidity, impact toughness and plasticity.
This technology of cored wire is a new method developed on the basis of jet metallurgy. It uses a bright steel strip as coating layer and an alloy powder as core. The core is blown into the molten steel by the professional cored wire machine.
It helps to improve the quality of molten steel, reduce refining cost and increase element yield. The cored wire also prevents oxidation in the steelmaking process. It can be inserted into the molten steel smoothly, and the addition speed is controlled precisely. Besides, it can prevent the reaction between the slag and the molten steel, and improve the morphology of inclusions and the quality of molten steel.
Calcium cored wire is made from steel strip by rolling and stuffed with alloy powders. It can be divided into different types according to the type of alloy powder: calcium silicide cored wire, pure calcium cored wire, carbon cored wire and ferro calcium cored wire. This kind of cored wire can greatly improve the element yield, reduce the cost of smelting and the time of steelmaking, precisely control the content of easily oxidized elements, purify the molten metal, and modify the shape of the inclusion.
In order to make the most effective use of Calcium Cored Wire, it is necessary to properly adjust its feeding speed and position. The feed point should be located at the center of the molten steel flow and away from the argon blowing circle. The cored wire should be fed to the molten steel at a depth where it can reach its melting temperature in the fastest way. In addition, the agitation caused by the wire feeding method should be reduced to reduce the splashing of the molten steel and to avoid inhaling slag.
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