Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1991-03-15
1992-07-07
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148328, 428659, C23C 206, C22C 3800
Patent
active
051279665
ABSTRACT:
A method of producing a hot-dip galvannealed steel sheet from a very-low-carbon cold-rolled steel sheet containing not less than 0.01 wt % but not more than 0.1 wt % of Ti, by subjecting the cold rolled steel sheet to a process conducted in a continuous hot-dip galvanizing system including a heat treatment, hot-dip galvanizing and a subsequent galvannealing. The method is characterized by the steps of: subjecting the cold-rolled steel sheet to a degreasing and an acid cleaning; subjecting the degreased and acid-cleaned steel sheet to a heat treatment conducted in a reducing gas atmosphere; and cooling the heat-treated steel sheet at a temperature not lower than 380.degree. C. but not higher than the hot-dip galvanizing bath temperature, before the steel sheet is subjected to the hot-dip galvanizing. The very-low-carbon cold- rolled steel sheet contains, besides not less than 0.01 wt % but not more than 0.1 wt % of Ti, not more than 0.005 wt % of C, not less than 0.01 wt % but not more than 0.1 wt % of Al, not less than 0.01 wt % but not more than 0.1 wt % of Ti, and the balance substantially incidental inclusions and Fe.
REFERENCES:
patent: 3843417 (1974-10-01), Ohbu et al.
patent: 4168972 (1979-09-01), Dreulle
Hanazawa Toshitake
Hashiguchi Koichi
Isobe Makoto
Ohori Manabu
Yamato Koji
Dean R.
Ip Sikyin
Kawasaki Steel Corporation
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