The cored pure calcium wire can be used for steelmaking to deoxidize, desulfurize, alloy and denaturate inclusions. A high-quality silicone calcium block is used, as well as a welded outer sheath. This product has a lower manufacturing cost, and a superior metallurgical result. Select a wire that has a strong sheath and a core of calcium. In addition, it is advisable to choose a welded sheath type that can withstand the tumbling action of the molten steel. In this way, you can prevent premature opening of the sheath and loss of calcium. This welded sheath has other advantages, such as lowering energy consumption and preventing evaporation.
Due to large temperature variations between molten metal and calcium powder, the melting of cored wires in liquid metal baths is a complicated problem. The numerical simulation of the process was developed to gain a deeper understanding of the processes and develop guidelines for optimizing the injection cored wires. Modeling results are in good agreement with the experimental data.
In order to achieve high calcium production, the speed of feeding is an important factor. A fast feed rate causes violent tumbles of the steel resulting in large quantities of calcium vapour. This vapor, however, is directly volatilized and not dissolved in the molten iron. The liquidation process begins before the core has been inserted to the proper depth when the feed speed is too slow. It leads to lower yields of calcium because the core is not dissolved in the molten metal until it's too late.
When the sheath is heated up by a fast feed, it can also increase as the depth of feed increases. In this case, the melt rate of the Calcium may be reduced. This can have a negative impact on the steel's quality. If you feed at a speed that is reasonable, the calcium will be consumed and absorbed in the proper depth before it can float up on the molten surface.
The best calcium addition depth is determined by a number of factors. This includes the steel type, ladle capability, and trim method. For optimizing injection, a model that predicts the melting behavior for cored wires under various conditions can be useful. This can result in significant time and energy savings. This model will also help reduce the amount of calcium injected in the casting process and increase the product quality. It is important to cast steels with a higher level of reactivity.
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