Roll formed metal profile of thin sheet

Abstract

A roll-shaped thin metal profile is made from a flat steel blank and has a required rupture limit higher than that one of the flat steel blank. The roll-shaped thin metal profile has a width selected in response to the required rupture limit.

1 . A roll-shaped thin sheet metal profile with partially along its longitudinal direction varying strength and/or shaping properties, characterized in that the flat blank ( 1 ,  7 ,  11 ) creating the profile ( 2 ,  5 ,  10 ) is constituted by an ultrahigh strength steel having a high tensile limit, the width of the blank being selected to match a relevant strength property.  
     
     
         2 . A metal profile according to  claim 1 , characterized in that its tensile strength amounts to above 700 N/mm 2 .  
     
     
         3 . A metal profile according to  claim 1 , characterized in that the blank ( 1 ,  7 ,  11 ) or the completed profile ( 2 ,  5 ,  10 ) has been exposed to a heat treatment by partial heating to above 300° C. within selected portions of the sheet in order to produce a remaining reduction of the rupture and tensile limits in order to facilitate a subsequent shaping or to produce deformation zones.