Method and device for producing stainless steel
AssigneeOutokumpu Steel Oy
InventorsMatti Honkaniemi, Veikko Juntunen, Jorma Kemppainen, Risto Pellikka, Eero Rattya
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Abstract
The invention relates to a method and device for producing stainless steel, comprising methods for creating a ferroalloy, such as ferrochromium, and for further processing the alloy in order to produce a desired stainless steel. According to the invention, the melt obtained from the ferro alloy production unit (1) is transferred at least partly to a ferroalloy processing unit (2) arranged in between the ferroalloy production unit (1) and the stainless steel production unit (5); in the said processing unit (2), the composition of the ferroalloy is adjusted to be suitable for the production of stainless steel.
Claims8
A method for producing stainless steel comprising creating a ferrochromium alloy and processing the ferrochromium alloy to produce an alloy suitable for stainless steel production, including the steps of:
- (a) melting ferrochromium in a furnace;
- (b) transferring ferrochromium melt from the furnace to a preconverter and adjusting the composition of the ferrochromium;
- (c) melting other metals used in stainless steel production in a furnace to produce a smelting product;
- and
- (d) transferring the ferrochromium from the preconverter and the smelting product in a transfer ladle to a converter for producing stainless steel.
Apparatus for producing stainless steel comprising in combination a ferrochromium production furnace for producing molten ferrochromium, a preconverter for adjusting the composition of molten ferrochromium produced in the ferrochromium production furnace, a furnace for melting other metals used in stainless steel production to produce a smelting product, a converter for producing stainless steel and transfer ladle means for transferring ferrochromium from said preconverter and said smelting product from said furnace to said converter.
Dependencies are inferred from the claim text.