Method for producing a hot strip from a steel which has a high manganese content

Abstract

A steel strip can be produced which in spite of its high manganese content has good deformation behaviour in that, according to the invention, from a steel which comprises more than 12 to 30 weight % of manganese, a roughed strip (V) is cast close to the final dimensions in a double-roller casting machine ( 2 ), said roughed strip comprising a thickness of up to 6 mm. Following casting, this roughed strip is further processed to form a continuous hot strip by preferably being rolled in a single hot roll pass.

1 . A method for producing a steel hot strip with TWIP and TRIP characteristics from a steel which comprises more than 12 weight % and up to 30 weight % of manganese, comprising 
 casting a melt in a double-roller casting machine so as to form a roughed strip at close to the final dimensions of said hot strip, said roughed strip having a thickness of up to 6 mm,    immediately after said casting step and without reheating said roughed strip, continuously processing said roughed strip by being hot rolled in a roll stand in a single hot roll pass to the final thickness of the hot strip, said hot strip having a fine-grained dendritic microstructure after the single hot roll pass.    
     
     
         2 . The method of  claim 1  wherein the thickness of the roughed strip is up to 4 mm.  
     
     
         3 . The method of  claim 1  wherein the thickness of the roughed strip is up to 2.5 mm.  
     
     
         4 . The method of  claim 1  further comprising cooling said roughed strip under controlled conditions immediately after casting.  
     
     
         5 . The method of  claim 4  wherein said cooling is conducted at a rate which is greater than the rate of cooling by exposure to ambient air.  
     
     
         6 . The method of  claim 1  wherein the average initial rolling temperature at which the roughed strip enters the roll stand for hot rolling is in the range between 750° C. and 1,100° C.  
     
     
         7 . The method of  claim 1  further comprising cooling the hot strip under controlled conditions after hot rolling to freeze in the fine-grained dendritic microstructure.  
     
     
         8 . The method of  claim 1  further comprising coiling the hot strip.  
     
     
         9 . The method of  claim 1  wherein processing of the roughed strip to form said hot strip takes place, at least in sections, in a protective gas atmosphere.  
     
     
         10 . The method of  claim 9  wherein the roughed strip is kept under said protective gas atmosphere at least until it enters said roll stand.  
     
     
         11 . The method of  claim 1  wherein the steel comprises up to 3.5 weight % of silicon.  
     
     
         12 . The method of  claim 1  wherein said steel comprises up to 3 weight % of silicon.  
     
     
         13 . The method of  claim 1  wherein said steel comprises up to 3.5 weight % aluminum.  
     
     
         14 . The method of  claim 1  wherein the steel comprises up to 3 weight % of aluminum.