Application & Addition:
Calcium is a universally deoxidizer and desulphurizer. Nickel Calcium alloy facilitate the addition of Calcium to molten bath during production of low alloy steels, stainless steel & heat resistant alloy, and Nickel base alloy. It is used in case where very high demands ore made on the degree of purity and surface quality of the steel or nickel base alloys.
Calcium is not only scavenger for deleterious elements but, when presents as a residual, it can improve ambient and high temperature properties of both ferrous and nickel base alloy.
The effectiveness and usefulness of are both largely influenced by the manner in which the alloy is added in the ladle, it most be done evenly through out the tapping time, and the ladle, by tapping stream. The addition rate of Nickel Calcium alloy is determined by oxygen, sulphur present in the melt and required residual Ca in alloy. Generally the required residual Ca in Austenitic stainless steel is 8 - 10 ppm for good surface finish and castebility.