Steel sheet for can and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10144985-B2
Application number	US-201414906131-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 17, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A steel sheet exhibiting good drawability and excellent buckling strength of a can body portion against an external pressure, and a method for manufacturing the same. The steel sheet includes C: 0.0030% or more and 0.0100% or less, Si: 0.05% or less, Mn: 0.10% or more and 1.0% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.010% or more and 0.100% or less, N: 0.0050% or less, Nb: 0.010% or more and 0.050% or less, and incidental impurities. Contents of C and Nb satisfy 0.10≤([Nb]/92.9)/([C]/12)<0.60, the HR30T hardness of the steel sheet is 56 or more, and the average Young's modulus of the steel sheet is 210 GPa or more.

First claim

The invention claimed is:

1. A steel sheet for a can, the steel sheet comprising:
C: 0.0030% or more and 0.0100% or less, by mass %;
Si: 0.05% or less, by mass %;
Mn: 0.25% or more and 1.0% or less, by mass %;
P: 0.030% or less, by mass %;
S: 0.020% or less, by mass %;
Al: 0.010% or more and 0.100% or less, by mass %;
N: 0.0050% or less, by mass %;
Nb: 0.010% or more and 0.050% or less, by mass %; and
Fe and incidental impurities,
wherein:
the contents of C and Nb satisfy Formula (1):
0.10≤([Nb]/92.9)/([C]/12)≤0.37  Formula (1),

[Nb] and [C] represent the contents (mass %) of Nb and C, respectively,

the steel sheet has a HR30T hardness of 56 or more, and
the steel sheet has an average Young's modulus of 210 GPa or more.

2. A steel sheet for a can, the steel sheet comprising:
C: 0.0030% or more and 0.0100% or less, by mass %;
Si: 0.05% or less, by mass %;
Mn: 0.25% or more and 1.0% or less, by mass %;
P: 0.030% or less, by mass %;
S: 0.020% or less, by mass %;
Al: 0.010% or more and 0.100% or less, by mass %;
N: 0.0050% or less, by mass %;
Nb: 0.010% or more and 0.050% or less, by mass %; and
Fe and incidental impurities,
wherein:
the contents of C and Nb satisfy Formula (1):
0.10≤([Nb]/92.9)/([C]/12)≤0.37  Formula (1),

[Nb] and [C] represent the contents (mass %) of Nb and C, respectively,

the steel sheet has a HR30T hardness of 56 or more,
the steel sheet has an average Young's modulus of 210 GPa or more,
texture measured with respect to the plane at one-quarter of the sheet thickness has an accumulation intensity of the orientation of ϕ 1 =30°, Φ=55°, and ϕ 2 =45°, on an Euler angle expression of Bunge basis, of 6.0 or more, and an average accumulation intensity of the orientation of ϕ 1 =0°, Φ=0° to 35°, and ϕ 2 =45° of 3.0 or more and 10.0 or less.

3. The steel sheet for a can, according to claim 1 , wherein the steel sheet includes ferrite having ferrite average grain size of less than 7 μm.

4. The steel sheet for a can, according to claim 1 , wherein the steel sheet further comprises at least one selected from the group consisting of Ti: 0.020% or less, by mass % and Mo: 0.020% or less, by mass %.

5. A method for manufacturing the steel sheet for a can according to claim 1 , the method comprising:
heating a steel slab at a heating temperature of 1,100° C. or higher,
hot rolling the steel slab at a finishing temperature of 800° C. to 950° C. to produce a hot rolled steel sheet,
coiling the hot rolled steel sheet at a coiling temperature of 500° C. to 700° C. to produce a coiled steel sheet,
performing pickling of the coiled steel sheet,
after pickling, cold rolling the steel sheet at a rolling reduction of 85% or more, and
annealing the steel sheet at a recrystallization temperature or higher.

6. A method for manufacturing the steel sheet for a can according to claim 1 , the method comprising:
heating a steel slab at a heating temperature of 1,100° C. or higher,
hot rolling the steel slab at a finishing temperature of 800° C. to 950° C. to produce a hot rolled steel sheet,
coiling the hot rolled steel sheet at a coiling temperature of 500° C. to 700° C. to produce a coiled steel sheet,
pickling the coiled steel sheet,
after pickling, cold rolling the steel sheet at a rolling reduction of 85% or more and 93% or less, and
annealing the steel sheet at a recrystallization temperature or higher.

7. The steel sheet for a can, according to claim 2 , wherein the steel sheet includes ferrite having ferrite average grain size of less than 7 μm.

8. The steel sheet for a can, according to claim 2 , wherein the steel sheet further comprises at least one selected from the group consisting of Ti: 0.020% or less, by mass % and Mo: 0.020% or less, by mass %.

9. A method for manufacturing the steel sheet for a can according to claim 2 , the method comprising:
heating a steel slab at a heating temperature of 1,100° C. or higher,
hot rolling the steel slab at a finishing temperature of 800° C. to 950° C. to produce a hot rolled steel sheet,
coiling the hot rolled steel sheet at a coiling temperature of 500° C. to 700° C. to produce a coiled steel sheet,
performing pickling of the coiled steel sheet,
after pickling, cold rolling the steel sheet at a rolling reduction of 85% or more, and
annealing the steel sheet at a recrystallization temperature or higher.

10. A method for manufacturing the steel sheet for a can according to claim 2 , the method comprising:
heating a steel slab at a heating temperature of 1,100° C. or higher,
hot rolling the steel slab at a finishing temperature of 800° C. to 950° C. to produce a hot rolled steel sheet,
coiling the hot rolled steel sheet at a coiling temperature of 500° C. to 700° C. to produce a coiled steel sheet,
pickling the coiled steel sheet,
after pickling, cold rolling the steel sheet at a rolling reduction of 85% or more and 93% or less, and
annealing the steel sheet at a recrystallization temperature or higher.

11. The steel sheet for a can, according to claim 1 , wherein the steel sheet includes C in the range from 0.0040% to 0.0080%, by mass %.

12. The steel sheet for a can, according to claim 2 , wherein the steel sheet includes C in the range from 0.0040% to 0.0080%, by mass %.

13. The steel sheet for a can, according to claim 1 , wherein the steel sheet includes Nb in the range from 0.015% to 0.030%, by mass %.

14. The steel sheet for a can, according to claim 2 , wherein the steel sheet includes Nb in the range from 0.015% to 0.030%, by mass %.

15. A can comprising the steel sheet of claim 1 .

16. A can comprising the steel sheet of claim 2 .

17. A steel sheet for a can, the steel sheet comprising:
C: 0.0030% or more and 0.0100% or less, by mass %;
Si: 0.05% or less, by mass %;
Mn: 0.10% or more and 1.0% or less, by mass %;
P: 0.030% or less, by mass %;
S: 0.020% or less, by mass %;
Al: 0.010% or more and 0.100% or less, by mass %;
N: 0.0050% or less, by mass %;
Nb: 0.020% or more and 0.050% or less, by mass %; and
Fe and incidental impurities,
wherein:
the contents of C and Nb satisfy Formula (1):
0.10≤([Nb]/92.9)/([C]/12)≤0.37  Formula (1),

[Nb] and [C] represent the contents (mass %) of Nb and C, respectively,

the steel sheet has a HR30T hardness of 56 or more, and
the steel sheet has an average Young's modulus of 210 GPa or more.

18. The steel sheet for a can, according to claim 17 , wherein the steel sheet includes Nb: 0.026% or more and 0.050% or less, by mass %.

19. A steel sheet for a can, the steel sheet comprising:
C: 0.0030% or more and 0.0100% or less, by mass %;
Si: 0.05% or less, by mass %;
Mn: 0.10% or more and 1.0% or less, by mass %;
P: 0.030% or less, by mass %;
S: 0.020% or less, by mass %;
Al: 0.010% or more and 0.100% or less, by mass %;
N: 0.0050% or less, by mass %;
Nb: 0.010% or more and 0.050% or less, by mass %; and
Fe and incidental impurities,
wherein:
the contents of C and Nb satisfy Formula (1):
0.10≤([Nb]/92.9)/([C]/12)≤0.24  Formula (1),

[Nb] and [C] represent the contents (mass %) of Nb and C, respectively,

the steel sheet has a HR30T hardness of 56 or more, and
the steel sheet has an average Young's modulus of 210 GPa or more.

Assignees

• Jfe Steel Corp

Inventors

• Saito Hayato
• Nakagawa Yusuke
• Kojima Katsumi
• Nakamaru Hiroki

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D6/008

  containing Si · CPC title

• C21D8/0226

  Hot rolling · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D1/26

  Methods of annealing · CPC title