Method for producing metal band material with different mechanical properties across the width of the band

Abstract

A method for producing metal band material with different mechanic& properties across the width of the band, in which the hand is heated zonally with regard to the width so that zones with a different heating state are temporarily produced and the band is then cooled in, order to produce regions with a different metal structure and thus different mechanical properties, wherein one or more zones that are to be heated are acted on with a heating device, while the other zones are isolated from the heating or are freed of the heating or are actively cooled or else a beat flow, which is introduced into the zones that are not to be heated, is diverted to contact masses that are resting against the zones that are not to be heated.

1 . A method for producing a metal band material with different mechanical properties across a width of the band, comprising:
 heating the band is zonally with regard to the width to temporarily produce zones with a different heating state by acting on one or more zones with a heating device; while any remaining zones that are not to be heated are isolated from the heating or are free of the heating or are actively cooled, or diverting a heat flow to contact masses that are resting against the remaining zones that are not to be heated; and   cooling, the band in order to produce regions with a different metal structure and thus different mechanical properties.   
     
     
         2 . The method according to  claim 1 , wherein the heating of the band from a starting temperature to a target temperature takes place within one pass, between two deflection rollers of a band looping apparatus. 
     
     
         3 . The method according to  claim 1 , wherein the cooling of the band takes place after the zonal heating within one pass of a band looping apparatus. 
     
     
         4 . The method according to  claim 1 , wherein both the heating and the cooling of the band take place within the same pass of a baud looping apparatus. 
     
     
         5 . The method according to  claim 1 , wherein in the region of a zonal heating and re-cooling, the band is guided with rollers, which are embodied as convex or concave depending on thermal expansion-dictated arching of the band. 
     
     
         6 . The method according to  claim 1 , wherein in at least one zone that is to be heated, the band has a difference in tensile strength of at least 30 MPa. 
     
     
         7 . The method according to  claim 1 , wherein in the one or more zones that are to be heated, the band has a difference in tensile strength of at least 5%, of a tensile strength of the untreated region. 
     
     
         8 . The method according to  claim 1 , wherein the one or more zones that is/are to be heated has a respective width of at least 20 mm.