STEEL SHEET FOR THREE-PIECE CAN AND METHOD FOR MANUFACTURING THE SAME

• US 20150299828A1
• Filed: 11/06/2013
• Published: 10/22/2015
• Est. Priority Date: 11/07/2012
• Status: Active Grant

• Current Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Original Assignee: JEF Steel Corporation
• Inventors: Suto, Mikito, Kojima, Katsumi, Tada, Masaki, Nakamaru, Hiroki
• Granted Patent: US 10,392,682 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C21D 6/005 containing Mn
• CPC Class Codes: C21D 6/008 containing Si
• CPC Class Codes: C21D 8/0226 Hot rolling
• CPC Class Codes: C21D 8/0263 following hot rolling
• CPC Class Codes: C21D 8/0278 involving a particular surface treatment C21D8/0294 takes precedence
• CPC Class Codes: C21D 8/0473 Final recrystallisation annealing
• CPC Class Codes: C21D 9/46 for sheet metals
• CPC Class Codes: C22C 38/00 Ferrous alloys, e.g. steel alloys cast-iron alloys C22C37/00
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/002 containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• CPC Class Codes: C22C 38/004 Very low carbon steels, i.e. having a carbon content of less than 0,01%
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

Provided are a steel sheet for a can having high buckling strength for a can body against an external force and excellent formability when being formed into a shape having a design effect by additionally giving elongation strain in the circumferential direction after the steel sheet having been formed into a cylindrical shape and a method for manufacturing the steel sheet. The chemical composition is controlled to contain, by mass %, C: 0.0005% or more and 0.0035% or less, Si: 0.050% or less, Mn: more than 0.60% and 1.00% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.010% or more and 0.100% or less, N: 0.0030% or less, B: 0.0005% or more, and the balance being Fe and inevitable impurities, in which the relationship B/N≧0.50 is satisfied where B/N represents

(B(mass %)/10.81)/(N(mass %)/14.01), and a Young'"'"'s modulus in a direction at an angle of 90° to the rolling direction is 220 GPa or more.

Claims

1. A steel sheet for a three-piece can, the steel sheet having a chemical composition containing, by mass %, C:

0.0005% or more and 0.0035% or less, Si;

0.050% or less, Mn;

more than 0.60% and 1.00% or less, P;

0.030% or less, S;

0.020% or less, Al;

0.010% or more and 0.100% or less, N;

0.0030% or less, B;

0.0005% or more, and the balance being Fe and inevitable impurities, wherein;

the relationship B/N≧

0.50 is satisfied (where B/N represents (B(mass %/10.81)/(N(mass %)/14.01)); and

a Young'"'"'s modulus in a direction at an angle of 90°

to the rolling direction is 220 GPa or more.

2. The steel for a three-piece can according to claim 1, wherein:

a Lankford value in a direction at an angle of 90°

to the rolling direction is less than 1.00;

a yield point elongation is 3.0% or less after a heat treatment at a temperature of 210°

C. for a duration of 20 minutes; and

a breaking elongation is 25% or more after a heat treatment at a temperature of 210°

C. for a duration of 20 minutes.

3. The steel sheet for a three-piece can according to claim 1, wherein the steel sheet has a microstructure in which:

an average integrated intensity of (111) [1-10] to (111) [−

1-12] orientations in a plane parallel to a surface of the steel sheet is less than 7.0; and

an average integrated intensity of (001) [1-10] to (111) [1-10] orientations in a plane parallel to the surface of the steel sheet is 3.8 or more.

4. The steel sheet for a three-piece can according to claim 2, wherein the steel sheet has a microstructure in which:

an average integrated intensity of (111) [1-10] to (111) [−

1-12] orientations in a plane parallel to a surface of the steel sheet is less than 7.0; and

an average integrated intensity of (001) [1-10] to (111) [1-10] orientations in a plane parallel to the surface of the steel sheet is 3.8 or more.

5. A method for manufacturing a steel sheet for a three-piece can, the method comprising:

performing hot rolling on a steel slab under a condition that the reheating temperature is higher than 1100°

C. and 1300°

C. or lower and that the final finish rolling temperature is 850°

C. or higher and lower than 950°

C., the steel slab having a chemical composition containing, by mass %, C;

0.0005% or more and 0.0035% or less, Si;

0.050% or less, Mn;

more than 0.60% and 1.00% or less, P;

0.030% or less, S;

0.020% or less, Al;

0.010% or more and 0.100% or less, N;

0.0030% or less, B;

0.0005% or more, and the balance being Fe and inevitable impurities, in which a relationship B/N≧

0.50 is satisfied where B/N represents (B(mass %)/10.81)/(N(mass %)/14.01);

coiling the hot-rolled steel sheet at a temperature of 500°

C. or higher and lower than 650°

C.;

pickling and thereafter cold rolling the coiled steel sheet with a rolling reduction of more than 92.0%;

recrystallization annealing at a temperature of higher than 700°

C. and 800°

C. or lower using a continuous annealing process; and

skin pass rolling the recrystallization annealed steel sheet with an elongation ratio of 0.5% or more and 5.0% or less.