Process of producing steel strips suitable for an oxidation-resisting surface coating

Abstract

A process is described for producing steel strips suitable for receiving a surface coating which is resisting to oxidation, in particular tin plating, of medium productivity, that does not require for its execution plants extended of a large areas or involving high economical investments. It comprises, starting from pickled hot strips having a thickness >0.7 mm, preferably obtained from thin-slab plants, a single cold rolling step by passing through not more than three stands of the Sendzimir 6Zhi type for the cold reduction of thickness to less than 0.25 mm and subsequent annealing. It is possible to obtain final thicknesses <0.18 mm both by simple reduction, which only provides subsequent skin-passing and finishing steps, and by double reduction on half-raw strip, which provides subsequent passes for thickness reduction of 30%.

1 .- 4 . (canceled) 
   
   
       5 . A process for producing steel strips adapted to receive an oxidation resisting surface coating, comprising:
 providing a pickled hot strip having a thickness≧0.7 mm;   performing a single cold rolling step by passing through not more than three stands of a Sendzimir 6Zhi type to obtain a cold reduction of the thickness to less than 0.25 mm; and   performing a subsequent annealing step.   
   
   
       6 . The process of  claim 5 , wherein the steel strips are simple reduction (SR) steel strips, and wherein
 the single cold rolling step is carried out until a thickness≦0.18 mm is reached, and   the annealing step is followed only by skin-passing and finishing steps.   
   
   
       7 . The process of  claim 5 , wherein the steel strips are half-raw double reduction (DR) steel strips, and wherein
 the single cold rolling step is carried out until a thickness between 0.20 mm and 0.25 mm is reached, and   upon annealing, the thickness is reduced to less than 0.18 mm.   
   
   
       8 . The process of  claim 5 , wherein the pickled hot strip having a thickness≧0.7 mm is obtained through a thin-slab plant. 
   
   
       9 . The process of  claim 5 , wherein the steel strips are half-raw double reduction (DR) steel strips, and wherein
 the single cold rolling step is carried out until a thickness between 0.20 mm and 0.25 mm is reached, and   upon annealing, the thickness undergoes a reduction of about 30%.