Calcium wire is used as an additive in steelmaking. It is one of the most common additives. The main purpose of calcium treatment is to make the inclusions in the steel less harmful. In addition, the treatment can improve the mechanical properties of the steel.
There are several different types of calcium wire. This is because each type has its own properties and effects. Some of them are solid calcium wires and others are cored wires. They are all used for different purposes. For example, the solid pure calcium cored wire is often used in the steelmaking industry.
Calcium silicon alloy is a composite alloy made from calcium, silicon, iron elements, and sulfur. These three elements are combined in order to increase the solubility of the calcium in molten steel. Therefore, it is an efficient way to improve the economic benefits of cast iron. Moreover, it is an effective deoxidizer and desulfurizer. Cored wire can also be used as a deoxidizer.
Compared with other types of wire, the overall production cost of solid pure calcium cored wire is relatively stable. But, the situation is not ideal in the short term. Since the calcium oxide impurities are reduced, the penetration capacity of the wire increases. However, the wire is not easy to break. Thus, operators should strictly follow the instructions in the operation manual.
If you want to use pure calcium cored wire, you need to use a thicker steel strip as the encasing material. Using a thicker sheath can increase the wire's ability to reach a sufficient ferrostatic pressure. Furthermore, the sheath can limit the loss caused by evaporation of calcium.
If you need to use pure calcium cored wire, you should carefully observe the slag layer and molten steel at all times. The speed of feeding also affects the absorption of the molten calcium. Consequently, if the speed is too fast or too slow, the yield of calcium will be greatly decreased. Besides, it is important to observe the eutectic composition of the steel at all times.
Calcium wire is made of metal calcium, which has a low melting point. However, it has a strong affinity to oxygen and sulfur. Metal calcium can also easily oxidize when injected into the molten steel. When this happens, the alumina inclusions will change to calcium aluminates. To avoid this, the diameter of the wire should be smaller than that of the molten steel.
The most important factor affecting the metallurgical effect of the solid calcium wire is the feeding speed. The higher the speed, the faster the wire can penetrate the molten steel. Also, the higher the feeding speed, the higher the rate of absorption of calcium. On the other hand, the lower the speed, the higher the rate of oxidation. Hence, it is necessary to adjust the speed to the best degree.
Generally speaking, the feeding process of solid pure calcium cored wire is divided into two stages: first, the wire is melted at a certain depth. Second, the molten calcium is removed.
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