Heating method of a semi-finished metal products

Abstract

A method for heating at least one semi-finished metal products to be further laminated, via a heat exchanging device comprising a chamber containing solid particles, supporting means able to support semi-finished metal product and a gas injector, having the successive steps of: i. injecting a gas into said chamber so as to form a fluidized bed, ii. inserting at least one hot semi-finished metal product such that said at least one hot semi-finished metal product is able to transfer heat to said fluidized bed, iii. inserting said at least one semi-finished metal product to be further laminated such that said fluidized bed is able to transfer heat to said at least one semi-finished metal product to be further laminated, iv. taking out said at least one semi-finished metal product to be further laminated of said fluidized bed when the temperature of said at least one semi-finished metal product to be further laminated is less than 100° C. below the temperature of said fluidized bed.

What is claimed is: 
     
         1 - 9 . (canceled) 
     
     
         10 : A method for heating at least one semi-finished metal product to be further laminated, via a heat exchanging device having a chamber containing solid particles, a support able to support the semi-finished metal product and a gas injector, the method comprising the successive steps of:
 i. injecting a gas into the chamber so as to form a fluidized bed,   ii. inserting at least one hot metal product, having a temperature from 400° C. to 1000° C., into the fluidized bed, the temperature of the inserted at least one hot metal product being greater than the temperature of the fluidized bed such that the at least one hot metal product is able to transfer heat to the fluidized bed;   iii. inserting the at least one semi-finished metal product to be further laminated, having a temperature from −20° C. to 200° C. into the fluidized bed, the temperature of the at least one semi-finished metal product to be further laminated being smaller than the temperature of the fluidized bed such that said fluidized bed is able to transfer heat to the at least one semi-finished metal product to be further laminated, and   iv. taking the at least one semi-finished metal product to be further laminated out of the fluidized bed when the temperature of the at least one semi-finished metal product to be further laminated is less than 100° C. below the temperature of the fluidized bed.   
     
     
         11 : The method as recited in  claim 10  wherein the semi-finished and hot metal products are made of steel. 
     
     
         12 : The method as recited in  claim 10  wherein the semi-finished and hot metal products are a slab or a bloom or a billet or a blank or an ingot. 
     
     
         13 : The method as recited in  claim 10  wherein the at least one hot metal product is taken out of the fluidized bed when the temperature of the hot metal product is from the temperature of the fluidized bed to 100° C. higher than the temperature of the fluidized bed. 
     
     
         14 : The method as recited in  claim 10  wherein at least a second hot metal product, having a temperature from 400° C. to 1000° C., is inserted into the fluidized bed between the steps ii and iii or between the steps iii and iv or after the step iv. 
     
     
         15 : The method as recited in  claim 10  wherein the at least one semi-finished metal product to be further laminated is taken out of the fluidized bed when the temperature of the semi-finished metal product to be further laminated is less than 50° C. below the temperature of the fluidized bed. 
     
     
         16 : The method as recited in  claim 10  wherein at least a second semi-finished metal product to be further laminated, having a temperature from −20° C. to 200° C., is inserted into the fluidized bed between the steps iii and iv or after the step iv. 
     
     
         17 : The method as recited in  claim 10  further method comprising a step v., after the step iv., wherein the semi-finished metal product to be further laminated taken out of the fluidized bed is heated in a reheating furnace to a temperature from 1100° C. to 1400° C. 
     
     
         18 : The method as recited in  claim 17  further comprising a step vi., after the step v. wherein the semi-finished metal product to be further laminated is hot rolled.