Steel sheet for cans and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2017198369-A1
Application number	US-201515313729-A
Country	US
Kind code	A1
Filing date	May 11, 2015
Priority date	May 30, 2014
Publication date	Jul 13, 2017
Grant date	—

Abstract

A can steel plate includes: equal or less than 0.0030% by mass of C; equal or less than 0.02% by mass of Si; 0.05-0.60% by mass of Mn; equal or less than 0.020% by mass of P; equal or less than 0.020% by mass of S; 0.010% to 0.100% by mass of Al; 0.0010-0.0050% by mass of N; 0.001-0.050% by mass of Nb; and balance Fe and impurities. Intensity of (111) [1-21] orientation (where −2 represents 2 with bar in Miller indices) and intensity of (111)[1-10] orientation (where −1 represents 1 with bar in Miller indices) satisfy the following equation (1), and in a rolling direction and 90° direction from the rolling direction in a horizontal plane, tensile strength TS (MPa) and fracture elongation El (%) satisfy relations of the following equations (2) and (3). (Intensity of (111) [1-21] orientation)/(Intensity of (111) [1-10] orientation)>0.9 . . . (1), TS>550 . . . (2), El>−0.02×TS+17.5 . . . (3).

First claim

1 . A can steel plate comprising:
equal to or less than 0.0030% by mass of C; equal to or less than 0.02% by mass of Si; 0.05% to 0.60% by mass of Mn; equal to or less than 0.020% by mass of P; equal to or less than 0.020% by mass of S; 0.010% to 0.100% by mass of Al; 0.0010% to 0.0050% by mass of N; 0.001% to 0.050% by mass of Nb; and balance Fe and inevitable impurities, wherein an intensity of (111) [1-21] orientation (where -2 represents 2 with a bar in Miller indices) and an intensity of (111) [1-10] orientation (where -1 represents 1 with a bar in Miller indices) satisfy the following equation (1), and in a rolling direction and a 90° direction from the rolling direction in a horizontal plane, a tensile strength TS (MPa) and a fracture elongation El (%) satisfy relations of the following equation (2) and equation (3).
(Intensity of (111)[1-21]orientation)/(Intensity of (111)[1-10)orientation)≧0.9  (1)

TS≧550  (2)

El >−0.02×TS+17.5  (3)

2 . The can steel plate according to claim 1 , further comprising 0.0005% to 0.0020% by mass of B.

3 . The can steel plate according to claim 1 , further comprising 0.001% to 0.050% by mass of Ti.

4 . A method of manufacturing a can steel plate comprising:
forming a steel having a chemical component of a can steel plate into a slab by continuous casting; subjecting the slab to hot rough rolling; performing a finish rolling process within a temperature range of 850 to 960° C.; coiling up the slab in a temperature range of 500 to 600° C. and pickling the slab by acid; performing a cold rolling process at a rolling rate equal to or lower than 92%; performing an annealing process within a temperature range of 600 to 650° C.; and performing a temper rolling process, wherein the can steel plate comprising:
equal to or less than 0.0030% by mass of C;
equal to or less than 0.02% by mass of Si;
0.05% to 0.60% by mass of Mn:
equal to or less than 0.020% by mass of P;
equal to or less than 0.020% by mass of S;
0.010% to 0.100% by mass of Al;
0.0010% to 0.0050% by mass of N;
0.001% to 0.050% by mass of Nb; and
balance Fe and inevitable impurities, wherein
an intensity of (111) [1-21] orientation (where -2 represents 2 with a bar in Miller indices) and an intensity of (111)[1-10]orientation (where -1 represents 1 with a bar in Miller indices) satisfy the following equation (1), and
in a rolling direction and a 90° direction from the rolling direction in a horizontal plane, a tensile strength TS (MPa) and a fracture elongation El (%) satisfy relations of the following equation (2) and equation (3).
(Intensity of (111)[1-21]orientation)/(Intensity of (111)[1-10)orientation)>0.9  (1)

TS>550  (2)

El >−0.02×TS+17.5  (3)

5 . The can steel plate according to claim 2 , further comprising 0.001% to 0.050% by mass of Ti.

6 . The method of manufacturing a can steel plate according to claim 4 , wherein the can steel plate further comprises 0.001% to 0.050% by mass of Ti.

7 . The method of manufacturing a can steel plate according to claim 4 , wherein the can steel plate further comprises 0.0005% to 0.0020% by mass of B.

8 . The method of manufacturing a can steel plate according to claim 6 , wherein the can steel plate further comprises 0.0005% to 0.0020% by mass of B.

Assignees

• Jfe Steel Corp
• Thyssenkrupp Rasselstein Gmbh

Inventors

• Tanaka Takumi
• Nakagawa Yusuke
• Tada Masaki
• Kojima Katsumi
• Nakamaru Hiroki
• Stein-Fechner Kathleen
• Kaup Burkhard

Classifications

• C21D8/0236

  Cold rolling · CPC title

• C21D8/0436

  Cold rolling · CPC title

• C21D8/0226

  Hot rolling · CPC title

• C22C38/02

  containing silicon · CPC title

• C22C38/004 Primary

  Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title