HOT DIP COATING METHOD

Japanese Patent JPH01159360

A

PURPOSE:To inexpensively and easily execute hot dip coating while preventing deterioration of the material quality of a steel sheet on which a metallic layer of a low m. p. is previously coated by subjecting said steel sheet to hot dip coating and maintaining the temp. of the steel sheet at the temp. below the m. p. of the hot dip coating metal during this time. CONSTITUTION:The steel strip 2 un-coiled from a payoff reel 1 is brought into contact with a roll coater 4 which is kept immersed in a plating bath 3 heated by a heater 8 and is thereby subjected to the hot dip coating. After the plating deposition is adjusted by a gas blowing nozzle 5, the steel strip is taken up on a tension roll 6 to form a coil 7. The metal of the m. p. lower than the m. p. of the hot dip coating metal is previously coated on the above- mentioned steel strip 2 prior to the hot dip coating of the steel strip 2 in the above-mentioned hot dip coating. Furthermore, the plating is executed while a cooling gas is ejected from nozzles 9 to maintain the temp. of the steel 2 at the temp. below the m. p. of the hot dip coating metal, more preferably <=300 deg.C after the coating of the above mentioned metal before the end of the hot dip coating. The deterioration ot the material quality of the steel strip is thereby prevented and the thick plating with good adhesiveness is enabled.

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OKA MASARU
MATSUMURA GIICHI

JP24013887A

June 22, 1989

September 25, 1987

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NIPPON STEEL CORP

C23C2/02; C23C2/00; (IPC1-7): C23C2/02

Teruo Taniyama (3 outside)

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