Steel sheet for can and method for manufacturing the same

• US 10,851,434 B2
• Filed: 03/23/2015
• Issued: 12/01/2020
• Est. Priority Date: 03/28/2014
• Status: Active Grant

• Current Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Original Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Inventors: Saito, Hayato, Suto, Mikito, Kojima, Katsumi, Nakamaru, Hiroki
• Primary Examiner(s): Dunn, Colleen P
• Assistant Examiner(s): Liang, Anthony M
• Application Number:
  US15/128,667
• Publication Number:
  US 20170107592A1
• Time in Patent Office: 2,080 Days
• CPC Class Codes: B65D 1/12 Cans, casks, barrels, or drums
• CPC Class Codes: C21D 8/0226 Hot rolling
• CPC Class Codes: C21D 8/0236 Cold rolling
• CPC Class Codes: C21D 8/0263 following hot rolling
• CPC Class Codes: C21D 8/0268 between cold rolling steps
• 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: C22C 38/14 containing titanium or zirconium

Abstract

A steel sheet for a can having sufficient hardness and a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.0005% or more and 0.0030% or less, Si: 0.05% or less, Mn: 0.50% or more and 1.00% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.01% or more and 0.04% or less, N: 0.0010% or more and 0.0050% or less, B: 0.0005% or more and 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel sheet has a hardness (HR30T) of 56 or more, and an average Young'"'"'s modulus of 215 GPa or more.

Claims

1. A steel sheet for a can, the steel sheet having a chemical composition comprising:

C;

0.0016% or more and 0.0030% or less, by mass %;

Si;

0.05% or less, by mass %;

Mn;

0.50% or more and 1.00% or less, by mass %;

P;

0.030% or less, by mass %;

S;

0.020% or less, by mass %;

Al;

0.01% or more and 0.04% or less, by mass %;

N;

0.0010% or more and 0.0050% or less, by mass %;

B;

0.0005% or more and 0.0050% or less, by mass %; and

Fe and inevitable impurities,

wherein the steel sheet has a hardness (HR30T) of 56 or more and an average Young'"'"'s modulus of 215 GPa or more.

2. The steel sheet for a can according to claim 1, wherein the chemical composition of the steel sheet further comprises Ti:

0.005% or more and 0.020% or less, by mass %.

3. A method for manufacturing the steel sheet for a can according to claim 1, the method comprising:

hot-rolling a steel slab with a finishing delivery temperature of 800°

C. or higher and 950°

C. or lower to produce a steel sheet,

the steel slab having a chemical composition comprising;

C;

0.0016% or more and 0.0030% or less, by mass %,

Si;

0.05% or less, by mass %,

Mn;

0.50% or more and 1.00% or less, by mass %,

P;

0.030% or less, by mass %,

S;

0.020% or less, by mass %,

Al;

0.01% or more and 0.04% or less, by mass %,

N;

0.0010% or more and 0.0050% or less, by mass %,

B;

0.0005% or more and 0.0050% or less, by mass %, and

Fe and inevitable impurities,

coiling the hot-rolled steel sheet at a coiling temperature of 500C or higher and 700°

C. or lower,

cold-rolling the coiled steel sheet with a rolling reduction of 85% or more, annealing the cold-rolled steel sheet at an annealing temperature of 680°

C. or higher and 780°

C. or lower, and

performing second cold rolling with a rolling reduction of 5% or more and 15% or less,

wherein the cold-rolled steel sheet has a chemical composition comprising C;

0.0016% or more, and 0.0030% or less, by mass %.

4. The steel sheet for a can according to claim 1, wherein the steel sheet has a hardness (HR30T) of 58 or more and 70 or less.

5. The steel sheet for a can according to claim 1, wherein the steel sheet has an average Young'"'"'s modulus of 225 GPa or more and 230 GPa or less.

6. The method according to claim 3, wherein the chemical composition of the steel slab further comprises Ti:

0.005% or more and 0.020% or less, by mass %.

7. The steel sheet for a can according to claim 1, wherein a ratio Al/B is in a range of 6.0 or more to 25.0 or less.

8. The steel sheet for a can according to claim 1, wherein C:

0.0018% or more and 0.0030% or less, by mass %.