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Monel alloy used for ball valve

          Monel alloy is a kind of high nickel alloy material. Its main component is 64% ~ 70% nickel and 26% ~ 33% copper. It will form a mutual fusion alloy freezing in a temperature interval in the metallurgical process, and the liquidity is poor and it is easy to promote the dispersed shrinkage. Because nickel alloy is easy to breathe mainly in H2, CO, etc. It causes further dispersed shrinkage and cause "hornet's nest" defects. What’s worse, it will connect each other and go through the whole casting. A big problem of Monel alloy in casting is that big grain promotes the shrinkage porosity impurities of the dendritic crystal separating in the boundaries. To solve this problem, a series of measures such as advanced vacuum smelting and vacuum casting is used at present, which ensures castings quality of monel alloy.

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