Producing a product from a flexible rolled strip material

Abstract

A product is made from a rolled strip material with the steps: rolling of a strip material from a sheet metal; working of a blank out of the rolled strip material; forming of the blank to a formed part; cleaning the formed part such that an amount of maximal 0.7 ppm of diffusible hydrogen is introduced into the formed part by cleaning, and coating the formed part with a metal coating material for producing a corrosion protection coating, wherein the step of coating is carried out in an immersion bath with an electrolyte solution, wherein between the formed part and the electrolyte solution a flow is generated.

1 .- 16 . (canceled) 
     
     
         17 . A method for producing a product from a rolled strip material, comprising:
 rolling a strip material from sheet metal;   working a blank from the rolled strip material;   forming the blank to a formed part;   cleaning the formed part such that an amount of at most 0.7 parts per million (ppm) of diffusible hydrogen is introduced into the formed part by cleaning; and   coating at least a portion of the formed part with a metal coating material for producing a corrosion protection coating, wherein said coating is carried out in an immersion bath with an electrolytic solution,   wherein a flow is generated between the formed part and the electrolytic solution.   
     
     
         18 . The method of  claim 17 , wherein said cleaning is carried out by pickling. 
     
     
         19 . The method of  claim 17 , wherein said cleaning is carried out mechanically. 
     
     
         20 . The method of  claim 19 , wherein said cleaning is carried out by blasting or brushing. 
     
     
         21 . The method of  claim 17 , wherein the rolling of the strip material is a flexible rolling, wherein a variable thickness is produced along the length of the strip material. 
     
     
         22 . The method of  claim 21 , wherein the flexible rolling is carried out such that at least two portions are produced with different thicknesses, wherein a first thickness is smaller than a second thickness and the ratio of the first thickness to the second thickness is less than 0.8. 
     
     
         23 . The method of  claim 17 , wherein the forming is a hot-forming with simultaneous hardening, the forming further comprising:
 heating at least one partial area of the blank to an austenitizing temperature; and   hot-forming the blank with quick cooling, wherein the at least one heated partial area is hardened.   
     
     
         24 . The method of  claim 17 , wherein the forming is a cold-forming, wherein the cold-formed part is hardened before the coating. 
     
     
         25 . The method of  claim 17 , wherein the coating is carried out with a coating material, which has a mass proportion of zinc of at least 50%. 
     
     
         26 . The method of  claim 17 , wherein the coating is carried out continuously. 
     
     
         27 . The method of  claim 17 , wherein the coating is carried out such that the electrolytic solution is subjected to a pulsed current. 
     
     
         28 . The method of  claim 17 , wherein the coating comprises hot-dip galvanizing, wherein the formed part is dipped into an immersion bath of molten coating material with a temperature of at least 350° C. and at most the AC1-temperature of the steel material. 
     
     
         29 . The method of  claim 17 , further comprising, after said coating, heat treating the coated formed part at a temperature of at least 200° C. and at a temperature of at most the AC1-temperature of the steel material. 
     
     
         30 . The method of  claim 17 , wherein the steel material includes manganese and at least one of the micro-alloying elements niobium and titanium, wherein the total proportion of said micro-alloying elements amounts to 1000 ppm of the total mass at most. 
     
     
         31 . The method of  claim 17 , wherein areas of different ductility are produced in the formed part. 
     
     
         32 . A product made from a flexible rolled metal sheet, produced by:
 rolling a strip material from sheet metal;   working a blank from the rolled strip material;   forming the blank to a formed part;   cleaning the formed part such that an amount of at most 0.7 parts per million (ppm) of diffusible hydrogen is introduced into the formed part by cleaning; and   coating at least a portion of the formed part with a metal coating material for producing a corrosion protection coating, wherein said coating is carried out in an immersion bath with an electrolytic solution,   wherein a flow is generated between the formed part and the electrolytic solution.