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Patent Searching and Data


Title:
PRODUCTION OF HOT-DIP ZN ALLOY COATED STEEL SHEET EXCELLENT IN WORKABILITY
Document Type and Number:
Japanese Patent JPH042755
Kind Code:
A
Abstract:

PURPOSE: To easily produce a plated steel strip having superior rust-preventing property at a low cost by applying hot-dip Zn alloy coating to the surface of a steel strip and then carrying out cooling and heat treatment under respectively specified conditions.

CONSTITUTION: A cold rolled steel strip is plated with a hot dipping bath of Zn alloy, such as Zn-Fe, Zn-Mn, Zn-Ni, Zn-Al, and Zn-Cr, of 700-1200°C and then heated up to 700-950°C to undergo recrystallization annealing. Subsequently, the steel strip is cooled from >650°C down to room temp. - 400°C at ≥30°C/sec cooling rate, or, after the recrystallization annealing, the steel strip is cooled rapidly down to 250-450°C at ≥40°C/sec cooling rate and held at this temp. for 1-5min or the steel strip is cooled down to 650-800°C at 3-14°C/sec cooling rate, cooled down to 250-450°C at ≥40°C/sec cooling rate, and held at this temp. for 1-5min, or, the plated steel strip is cooled down to 650-800°C at 3-14°C/sec cooling rate and successively cooled down to 250-350°C at ≥40°C/sec cooling rate.


Inventors:
MATSUMURA GIICHI
OKA MASARU
Application Number:
JP10175290A
Publication Date:
January 07, 1992
Filing Date:
April 19, 1990
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C23C2/06; C21D9/56; C23C2/28; (IPC1-7): C23C2/06; C21D9/56; C23C2/28
Attorney, Agent or Firm:
Tachio Chanogi