Method for Manufacturing a Product from a Flexibly Rolled Strip Material

Abstract

The invention relates to a method for manufacturing a product from a flexibly rolled strip material comprising the steps: providing a strip material made from sheet steel, flexible rolling of the strip material, wherein a variable thickness is produced along the length of the strip material, electrolytic coating with a metallic coating material, which contains at least 93% of zinc, wherein the electrolytic coating is carried out after the flexible rolling, heat treatment at temperatures above 350° C. and below a solidus line of the coating material, wherein the heat treatment is carried out after the electrolytic coating, working a blank from the flexibly rolled strip material and cold or hot forming of the blank.

1 - 13 . (canceled) 
     
     
         14 . A method for manufacturing a product from a flexibly rolled strip material comprising the steps of:
 providing a strip material from sheet steel,   flexible rolling the strip material, wherein a variable thickness is produced along the length of the strip material,   electrolytically coating the strip material with a metallic coating material that at least contains zinc and iron,   working a blank from the flexibly rolled strip material, and   cold or hot forming the blank.   
     
     
         15 . The method according to  claim 14  wherein after the step of electrolytically coating, a heat treatment step is carried out at a temperature higher than 350° C. and below the solidus line of the coating material. 
     
     
         16 . The method according to  claim 14  wherein the metallic coating material has a minimum of 5% iron and a maximum of 80% iron. 
     
     
         17 . The method according to  claim 14  wherein the proportions of zinc and iron are selected such that at least partially δ1-phase is present in a deposited state. 
     
     
         18 . The method according to  claim 15  wherein the temperature is increased during the heat treatment. 
     
     
         19 . The method according to  claim 15  wherein the heat treatment is carried out inductively or by means of annealing in a bell-type annealing furnace, wherein the annealing is carried out with a holding time of 10 hours to 80 hours. 
     
     
         20 . The method according to  claim 14  wherein before the electrolytically coating step, the strip material is coated with an intermediate layer. 
     
     
         21 . The method according to  claim 20  wherein the intermediate layer contains nickel or aluminum or manganese. 
     
     
         22 . The method according to  claim 14  wherein after the electrolytically coating step, a scaling prevention is deposited. 
     
     
         23 . The method according to  claim 14  wherein the hot forming includes the steps of:
 cold pre-forming of the blank to a cold pre-formed component, 
 heating at least a partial area of the cold pre-formed component up to austenitization temperature, and 
 hot forming of the cold pre-formed component for producing a final contour. 
 
     
     
         24 . The method according to  claim 14  wherein the hot forming step includes the steps of:
 heating at least a partial area of the blank up to the austenitization temperature, and 
 hot forming of the blank for producing a final contour. 
 
     
     
         25 . The method according to  claim 14  wherein at a point of time when initiating the hot forming step, the coating material is in the solid state. 
     
     
         26 . A product made from a flexibly rolled sheet steel, which is coated after the flexible rolling with a metallic coating and is hot formed after the coating, and is manufactured according to a method according  claim 14 . 
     
     
         27 . A method for manufacturing a product from a flexibly rolled strip material comprising the steps of:
 providing a strip material made from sheet steel,   flexible rolling the strip material, wherein a variable thickness is produced along the length of the strip material,   electrolytically coating the strip of material with a metallic coating material that contains at least 93% of zinc, wherein the electrolytic coating is carried out after the flexible rolling,   heat treating the strip of material at temperatures above 350° C. and below a solidus line of the coating material, wherein the heat treatment is carried out after the electrolytic coating,   working a blank from the flexibly rolled strip material, and   cold or hot forming the blank.   
     
     
         28 . The method according to  claim 27  wherein after the step of electrolytically coating, a heat treatment step is carried out at a temperature higher than 350° C. and below the solidus line of the coating material. 
     
     
         29 . The method according to  claim 27  wherein the metallic coating material has a minimum of 5% iron and a maximum of 80% iron. 
     
     
         30 . The method according to  claim 27  wherein the proportions of zinc and iron are selected such that at least partially δ1-phase is present in a deposited state. 
     
     
         31 . The method according to  claim 28  wherein the temperature is increased during the heat treatment. 
     
     
         32 . The method according to  claim 28  wherein the heat treatment is carried out inductively or by means of annealing in a bell-type annealing furnace, wherein the annealing is carried out with a holding time of 10 hours to 80 hours. 
     
     
         33 . The method according to  claim 27  wherein before the electrolytically coating step, the strip material is coated with an intermediate layer. 
     
     
         34 . The method according to  claim 27  wherein the intermediate layer contains nickel or aluminum or manganese. 
     
     
         35 . The method according to  claim 27  wherein after the electrolytically coating step, a scaling prevention is deposited. 
     
     
         36 . The method according to  claim 27  wherein the hot forming includes the steps of:
 cold pre-forming of the blank to a cold pre-formed component, 
 heating at least a partial area of the cold pre-formed component up to austenitization temperature, and 
 hot forming of the cold pre-formed component for producing a final contour. 
 
     
     
         37 . The method according to  claim 27  wherein the hot forming step includes the steps of:
 heating at least a partial area of the blank up to the austenitization temperature, and 
 hot forming of the blank for producing a final contour. 
 
     
     
         38 . The method according to  claim 27  wherein at a point of time when initiating the hot forming step, the coating material is in the solid state. 
     
     
         39 . A product made from a flexibly rolled sheet steel, which is coated after the flexible rolling with a metallic coating and is hot formed after the coating, and is manufactured according to a method according  claim 27 .