Title:
BAKING HARDENING TYPE THIN STEEL SHEET EXCELLENT IN FORMABILITY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3390084
Kind Code:
B2
Abstract:
PURPOSE: To produce a baking hardening type thin steel sheet having baking hardenability and furthermore having excellent formability of high γ value.
CONSTITUTION: A steel slab having a compsn. contg., by weight, ≤0.0015% C, ≤0.1% Si, ≤0.5% Mn, ≤0.5% Al, ≤0.08% P, 0.01% S, 0.005% N, 0.03% Nb and 0.0001 to 0.0050%B, in which the Nb, C, B and N are contained also so as to satysfy the relationships of 1≤Nb (wt.%)/C (wt.%)≤30 and N (wt.%)-(14/11)B (wt.%)≤0.001 (wt.%), and the balance Fe with inevitable impurities is held under soaking in the temp. range of 1050 to 1300°C. After that, hot rolling is finished at the Ar3 transformation point or above, and it is coiled at ≤800°C, is successively subjected to cold rolling at 65 to 90% draft and is subjected to recrystallization annealing in the temp. range of 700 to 950°C.
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Inventors:
Hideko Yasuhara
Takashi Sakata
Toshiyuki Kato
Takashi Sakata
Toshiyuki Kato
Application Number:
JP5858294A
Publication Date:
March 24, 2003
Filing Date:
March 29, 1994
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
C21D8/04; C21D9/48; C22C38/00; C22C38/12; (IPC1-7): C22C38/00; C21D8/04; C21D9/48; C22C38/12
Domestic Patent References:
| JP762446A | ||||
| JP5287448A | ||||
| JP5263146A | ||||
| JP5112858A | ||||
| JP3211228A | ||||
| JP61281852A | ||||
| JP6126757A |
Attorney, Agent or Firm:
Junzo Ogawa (1 person outside)