Process for making stainless steel

Details Process for making stainless steel Process for making stainless steel

1974-06-19

1976-03-30

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 11, C21C 552

Patent

active

039472671

ABSTRACT:
An economical process for making a molten ferrous alloy containing from about 5.0% to about 30.0% by weight chromium and from 0% up to about 25.0% by weight nickel. The process comprises four basic operations:
1. partially reducing chrome ore and iron ore and (depending upon the type or reducing process used) converting the ores before, during or after the reducing step into an appropriate physical form for charging into a submerged-arc furnace;
2. preparing a charge consisting primarily of the reduced chrome and iron ores (preferably still hot from the reducing step) and smelting and reducing this charge by the submerged-arc process in a first vessel to yield an unrefined chrome alloy high in carbon and silicon;
3. transferring the molten alloy from the first vessel to a second vessel and directing gaseous oxygen thereagainst to reduce the carbon and silicon content thereof; and
4. thereafter introducing a mixture of gaseous oxygen and an inert gas or nitrogen into the molten alloy in the second vessel below the surface of the alloy to complete the refining and to minimize the loss of chromium.

REFERENCES:
patent: 3495971 (1970-02-01), Ban
patent: 3728101 (1973-04-01), Entremont

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