Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel

Abstract

The invention relates to a method for producing a hot strip from a triplex lightweight steel, wherein a melt is cast into a roughed strip and the latter is subsequently rolled into a hot strip. For this purpose, it is provided that the melt is cast in a horizontal strip casting facility under conditions of a calm flow and free of bending into a roughed strip in the range between 6 and 20 mm and is subsequently rolled into hot strip having a degree of deformation of at least 50%.

1 .- 15 . (canceled) 
     
     
         16 . A method for producing a hot strip from a triplex lightweight steel, comprising the steps of:
 casting a melt in a horizontal strip casting facility under conditions of a calm flow and free of bending to form a roughed strip having a thickness in a range between 6 and 20 mm; and   rolling the roughed strip into a hot strip with a degree of deformation of at least 50%.   
     
     
         17 . The method of  claim 16 , further comprising feeding the melt into the horizontal strip casting facility at a speed which equals a speed of a revolving conveyor belt of the horizontal strip casting facility. 
     
     
         18 . The method of  claim 17 , further comprising subjecting all surface elements of a strand shell, forming at the start of solidification, of a strip extending across a width of the conveyor belt to approximately same cooldown conditions. 
     
     
         19 . The method of  claim 17 , wherein the melt on the conveyor belt has substantially solidified at an end of the conveyor belt. 
     
     
         20 . The method of  claim 16 , further comprising passing the roughed strip through a homogenizing zone after complete solidification and before starting a further treatment. 
     
     
         21 . The method of  claim 20 , wherein the further treatment involves cutting the roughed strip into panels. 
     
     
         22 . The method of  claim 21 , further comprising heating the panels to a rolling temperature, and subsequently subjecting the panels to a rolling process. 
     
     
         23 . The method of  claim 20 , wherein the further treatment involves a coiling of the roughed strip. 
     
     
         24 . The method of  claim 23 , further comprising unwinding the roughed strip, heating the roughed strip to a rolling temperature, and subsequently subjecting the panels to a rolling process. 
     
     
         25 . The method of  claim 24 , further comprising reheating the roughed strip before being the unwinding step. 
     
     
         26 . The method of  claim 16 , further comprising subjecting the roughed strip in line to the rolling step, and further comprising coiling up the roughed strip. 
     
     
         27 . The method of  claim 16 , wherein the degree of deformation is >70% during hot rolling. 
     
     
         28 . The method of  claim 17 , further comprising applying a negative pressure in an area of the conveyor belt. 
     
     
         29 . The method of  claim 17 , further comprising supporting an underside of the conveyor belt by a plurality of rollers in side-by-side relationship. 
     
     
         30 . Hot strip from a triplex lightweight steel, having a mean grain size of>6 ASTM. 
     
     
         31 . The hot strip of  claim 30 , wherein the triplex lightweight steel has a chemical composition in weight-% of <0.6 C; >18 Mn; >8 Al; <0.25 Si, remainder iron including unavoidable steel-incidental elements. 
     
     
         32 . The hot strip of  claim 31 , wherein the triplex lightweight steel has optionally one or more precipitation-forming elements of type B, Ta, Zr, Nb, V, Ti, Mo and W collectively at a maximum of 2 weight-%.