The molten nickel iron mix is poured onto a moving cooling conveyor where it is cast into nickel pig iron ingots

Why Use Nickel Pig Iron

Austenitic Stainless Steels: When nickel is added to stainless steel in sufficient amounts the crystal structure changes to "austenite". The basic composition of austeniltic stainless steels is 18% chromium and 8% nickel. Austenitic grades are the most commonly used stainless steels accounting for more than 70% of production (type 304 is the most commonly specified grade by far). So, why use nickel pig iron.

As with most things the main reason is price advantage.
Nickel pig iron provides, besides nickel, chrome (Cr) in addition to carbon (C) and silicon (Si), all of which are needed in the production of stainless steel.
While carbon and silicon are only required in small amounts in the finished product both play a major part in the cleaning and refining of the molten steel after leaving the EOF (electric arc furnace) or the IF (induction furnace) while also preventing the desired elements from oxidizing to a stable oxide (simplified).

Adamite Heavy Castings: Manufacturers of heavy castings, particularly roll manufacturers are able to use nickel pig iron as a direct source of nickel, chrome, silicon and carbon mixed with HS1/2 scrap to give a much reduced cost of raw materials.

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