US2025236936A1PendingUtilityA1

Enamelable steel sheet and method of manufacturing the same

Assignee: VOESTALPINE STAHL GMBHPriority: Jan 24, 2024Filed: Jan 14, 2025Published: Jul 24, 2025

Est. expiryJan 24, 2044(~17.5 yrs left)· nominal 20-yr term from priority

Inventors:Klemens Mraczek Bernhard Haneder

C21D 8/02C23D 5/00C22C 38/16C22C 38/14C22C 38/12C22C 38/105C22C 38/06C22C 38/02C22C 38/002C22C 38/001C21D 9/46C21D 8/0263C21D 8/0236C21D 8/0226C21D 6/008C21D 6/007C21D 6/005C21D 6/001C21D 8/0273C22C 38/10C22C 38/08C22C 38/04C21D 8/0205

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Claims

Abstract

An enamelable, cold-rolled and finally annealed steel sheet and a method of manufacturing the same are described. The steel sheet consists of the following elements (in % by weight): C: 0.05-0.09%, Mn: 1.0-2.0%, V: 0.02-0.1%, Nb: 0-0.3%, Ti: 0-0.3%, Si: <0.3%, Al: <0.1%, Ni: <0.35%, Co: <0.2%, N: <0.04%, S: <0.04%, P: <0.1%, Mo: <0.3%, Ca: <0.2%, the balance iron and unavoidable impurities.

Claims

exact text as granted — not AI-modified

1 . An enamelable, cold-rolled and finally annealed steel sheet, the steel sheet consisting of the elements (in % by weight):
 C: 0.05-0.09%,   Mn: 1.0-2.0%,   V: 0.02-0.1%,   Nb: 0-0.3%,   Ti: 0-0.3%,   Si: &lt;0.3%,   Al: &lt;0.1%,   Ni: &lt;0.35%,   Co: &lt;0.2%,   N: &lt;0.04%,   S: &lt;0.04%,   P: &lt;0.1%,   Mo: &lt;0.3%,   Ca: &lt;0.2%,   the balance iron and unavoidable impurities.   
     
     
         2 . The enamelable, cold-rolled and finally annealed steel sheet of  claim 1 , wherein the steel sheet is configured to have a yield strength Rp0.2&gt;300 MPa after a single enamel firing process. 
     
     
         3 . The enamelable, cold-rolled and finally annealed steel sheet of  claim 1 , wherein the steel sheet is configured to have a yield strength Rp0.2&gt;300 MPa after a double enamel firing process. 
     
     
         4 . The enamelable, cold-rolled and finally annealed steel sheet of  claim 1 , wherein
 V: 0.025-0.07% or 0.03-0.06%.   
     
     
         5 . The enamelable, cold-rolled and finally annealed steel sheet of  claim 1 , wherein
 Mn: 1.1-1.8% or 1.2-1.7%.   
     
     
         6 . The enamelable, cold-rolled and finally annealed steel sheet of  claim 1 , wherein the steel sheet has a thickness in the range from 1.6 mm to 4 mm, or between 2 mm and 3 mm. 
     
     
         7 . An enameled, cold-rolled and finally annealed steel sheet, the steel sheet consisting of the elements (in % by weight):
 C: 0.05-0.09%,   Mn: 1.0-2.0%,   V: 0.02-0.1%,   Nb: 0-0.3%,   Ti: 0-0.3%,   Si: &lt;0.3%,   Al: &lt;0.1%,   Ni: &lt;0.35%,   Co: &lt;0.2%,   N: &lt;0.04%,   S: &lt;0.04%,   P: &lt;0.1%,   Mo: &lt;0.3%,   Ca: &lt;0.2%,   the balance iron and unavoidable impurities, and   has a yield strength Rp0.2&gt;300 MPa.   
     
     
         8 . The enameled, cold-rolled and finally annealed steel sheet of  claim 7 , produced by a single enamel firing process. 
     
     
         9 . The enameled, cold-rolled and finally annealed steel sheet of  claim 7 , produced by a double enamel firing process. 
     
     
         10 . A method of manufacturing an enamelable, cold-rolled and finally annealed steel sheet, the method comprising:
 melting of a steel melt consisting of the elements (in % by weight):
 C: 0.05-0.09%, 
 Mn: 1.0-2.0%, 
 V: 0.02-0.1%, 
 Nb: 0-0.3%, 
 Ti: 0-0.3%, 
 Si: &lt;0.3%, 
 Al: &lt;0.1%, 
 Ni: &lt;0.35%, 
 Co: &lt;0.2%, 
 N: &lt;0.04%, 
 S: &lt;0.04%, 
 P: &lt;0.1%, 
 Mo: &lt;0.3%, 
 Ca: &lt;0.2%, 
 the balance iron and unavoidable impurities; 
   casting the molten steel into a preliminary product;   hot rolling of the preliminary product into a hot strip;   cold rolling the hot strip into a cold-rolled steel sheet; and   final annealing of the cold-rolled steel sheet.   
     
     
         11 . The method of  claim 10 , wherein an end temperature of hot rolling is 890-950° C. 
     
     
         12 . The method of  claim 10 , wherein the cold rolling of the hot strip into a cold-rolled steel sheet is carried out in one or more stages with a total cold rolling degree of at least 50% or 60% or 65%. 
     
     
         13 . The method of  claim 10 , wherein the final annealing of the cold-rolled steel sheet is carried out at a final annealing temperature in a range between 550° C. and 700° C., in particular 550° C. and 650° C. or 550° C. and 620° C. or 550° C. and 600° C. 
     
     
         14 . The method of  claim 10 , wherein the final annealing of the cold-rolled steel sheet comprises batch annealing. 
     
     
         15 . The method of  claim 14 , wherein the batch annealing of the cold-rolled steel sheet is carried out with a total annealing time whose lower limit is 20 or 25 or 30 hours and whose upper limit is 40 hours. 
     
     
         16 . The method of  claim 10 , wherein the final annealing of the cold-rolled steel sheet is carried out as continuous annealing in a continuous annealing furnace. 
     
     
         17 . The method of  claim 16 , wherein an annealing temperature of 650-750° C., preferably 690-725° C., is set in the continuous annealing furnace. 
     
     
         18 . The method of  claim 10 , further comprising:
 coiling the hot-rolled steel sheet with a coiling temperature of 600-750° C.

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