Title:
PRODUCTION OF STEEL SHEET FOR HIGH STRENGTH GALVANNEALING EXCELLENT IN DEEP DRAWABILITY AND PLATING ADHESION AND PRODUCTION OF GALVANNEALED STEEL SHEET
Document Type and Number:
Japanese Patent JP2550849
Kind Code:
B2
Abstract:
PURPOSE: To produce a high strength galvannealed steel sheet excellent in plating adhesion as well as in deep drawability and also to produce a steel sheet for plating suitable for the steel sheet.
CONSTITUTION: A steel having a composition containing, by weight, ≤0.005% C, ≤2% Mn, 0.05-0.15% P, ≤0.005% N, ≤0.02% S, and Ti by the amount in the range between {4[C]+3.43[N]+1.5[S]} and 0.1% (where [C], [N], and [S] represent respective weight percentages of C, N, and S) is soaked at ≥1150°C for ≥30min and hot-rolled, and finish rolling is completed at a temp. in the range between the Ar3 transformation point and (Ar3 transformation point +100°C). The resulting steel plate is coiled at 630-550°C, pickled, and cold-rolled. Further, the resulting steel sheet for plating is used and this steel sheet is annealed at a temp. not lower than the recrystallization temp. and subjected to hot dipping by the use of a hot-dip galvanizing bath, in which Al content is controlled so that prescribed requirements are satisfied, and then to alloying treatment.
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Inventors:
NAMITA YOSHIHARU
IWAI TAKAFUSA
OOMYA YOSHINOBU
KASE TOMOHIRO
URAI MASAAKI
IWAI TAKAFUSA
OOMYA YOSHINOBU
KASE TOMOHIRO
URAI MASAAKI
Application Number:
JP4835093A
Publication Date:
November 06, 1996
Filing Date:
March 09, 1993
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
C21D8/04; C21D9/48; C22C38/00; C22C38/14; C23C2/06; C23C2/28; C23C2/40; (IPC1-7): C21D9/48; C21D8/04; C23C2/06; C23C2/28; C23C2/40
Domestic Patent References:
| JP2163346A | ||||
| JP3232927A | ||||
| JP466653A |
Attorney, Agent or Firm:
Ueki Kuichi