FIELD: metallurgy.
SUBSTANCE: method is implemented in electric arc furnace, to which a metal mixture is fed, containing 30…35% of liquid pig iron, 5…10% cold pig iron and 60…65% trim rolled sheet steel of automobile-body brands of cold-rolling department, it is melted, during oxidation period an injection of carbonaceous material at a rate of 60-100 kg / min is produced, purging of the bath with oxygen is carried out until the residual carbon content is no more than 0.03%. Upon completion the bath is agitated with argon through the bottom plugs for no less than 5 minutes with intensity no less than 60 l/min. Steel tapping is carried out with leaving slag and a part of metal in a furnace with an additive of a ladle during tapping of solid slag-forming mixture, deoxidising agents and alloying agents.
EFFECT: invention allows to obtain the in the finished mild automobile-body steel the required content of carbon, chromium, nickel, copper and nitrogen in the finished steel for further production of cold-rolled steel sheet for automotive sheet.
1 ex
Title | Year | Author | Number |
---|---|---|---|
STEEL-MAKING METHOD IN ARC ELECTRIC STEEL-SMELTING FURNACE | 2008 |
|
RU2384627C1 |
PROCEDURE FOR MELTING STEEL IN ARC STEEL MELTING FURNACE WITH INCREASED CONSUMPTION OF LIQUID IRON | 2010 |
|
RU2437941C1 |
METHOD OF MELTING OF CARBONIC AND LOW ALLOYED GRADES OF STEEL | 2006 |
|
RU2336310C2 |
METHOD OF MELTING VANADIUM-CONTAINING STEEL IN ELECTRIC ARC FURNACE | 1996 |
|
RU2102497C1 |
PROCEDURE FOR STEEL MELTING | 2009 |
|
RU2409682C1 |
PROCEDURE FOR RAIL STEEL MELTING | 2009 |
|
RU2400541C1 |
STEEL PRODUCTION METHOD AND LINE | 1994 |
|
RU2092572C1 |
PROCEDURE FOR MELTING RAIL STEEL | 2009 |
|
RU2398888C1 |
METHOD OF STEEL MELTING | 2007 |
|
RU2347820C2 |
METHOD FOR STEEL MELTING IN HEARTH-TYPE MELTING UNIT | 2001 |
|
RU2205230C2 |
Authors
Dates
2012-07-10—Published
2010-10-11—Filed