| US 7,534,312 B2 | ||
| Steel plate exhibiting excellent workability and method for producing the same | ||
| Naoki Yoshinaga, Futtsu (Japan); Nobuhiro Fujita, Futtsu (Japan); Manabu Takahashi, Futtsu (Japan); Koji Hashimoto, Futtsu (Japan); Shinya Sakamoto, Kimitsu (Japan); Kaoru Kawasaki, Himeji (Japan); Yasuhiro Shinohara, Futtsu (Japan); and Takehide Senuma, Futtsu (Japan) | ||
| Assigned to Nippon Steel Corporation, Tokyo (Japan) | ||
| Appl. No. 10/487,797 PCT Filed Jun. 27, 2002, PCT No. PCT/JP02/06518 § 371(c)(1), (2), (4) Date Feb. 24, 2004, PCT Pub. No. WO03/018857, PCT Pub. Date Mar. 06, 2003. |
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| Claims priority of application No. 2001-255384 (JP), filed on Aug. 24, 2001; application No. 2001-255385 (JP), filed on Aug. 24, 2001; and application No. 2002-153030 (JP), filed on May 27, 2002. | ||
| Prior Publication US 2004/0238081 A1, Dec. 02, 2004 | ||
| Int. Cl. C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01) | ||
| U.S. Cl. 148—320 [148/332; 148/333; 148/336] | 11 Claims |
| 1. A steel sheet excellent in workability, comprising:
steel including, in mass,
0.11 to 0.25% C,
0.001 to 1.5% Si,
0.01 to 2.0% Mn,
0.001 to 0.04% P,
at most 0.05% S,
0.001 to 0.007% N, and
0.008 to 0.2% Al;
the steel sheet having an increased texture of the {110} orientation resulting in the steel sheet having an average r-value
of at least 1.2, an r-value in the rolling direction (rL) of at least 1.3; an r-value in the direction of 45 degrees to the
rolling direction (rD) of at least 0.9, and an r-value in the direction of a right angle to the rolling direction (rC) of
at least 1.2, wherein the steel sheet having ratios of X-ray diffraction intensities in the orientation components of {111},
{100} and {101} to random X-ray diffraction intensities on a reflection plane at the thickness center of said steel sheet
are at least 2.0, at most 1.0 and exceeds 0.2, respectively.
|