METHOD FOR MANUFACTURING HIGH-STRENGTH MOLTEN ZINC PLATED STEEL SHEET

WIPO Patent Application WO/2018/211920

A1

The purpose of the present invention is to provide a method for manufacturing a high-strength molten zinc plated steel sheet having a high-strength-elongation balance with superior plating adherence and surface appearance. This method comprises a first heating step wherein a steel sheet with a prescribed component composition is heated to a temperature range of 800 – 950°C in an atmosphere with an H2 concentration of 0.05 – 30.0 vol% and a dew point of 0°C or less, a first acid washing step wherein the steel sheet after the first heating step is acid washed in an oxidizing acidic aqueous solution and washed with water, a second acid washing step wherein the steel sheet after the first acid washing step is acid washed in a non-oxidizing acidic aqueous solution and washed with water, a second heating step wherein the steel sheet after the second acid washing step is maintained in a temperature range of 700 – 900°C in an atmosphere with an H2 concentration of 0.05 – 30.0 vol% with a dew point of 0°C or less for 20 – 300 seconds, and a step for molten zinc plating of the steel sheet after the second heating step.

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TERASHIMA SHOTARO (JP)
FUSHIWAKI YUSUKE (JP)
MAKIMIZU YOICHI (JP)
MASUOKA HIROYUKI (JP)
HASEGAWA HIROSHI (JP)

PCT/JP2018/016546

November 22, 2018

April 24, 2018

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JFE STEEL CORP (JP)

C23C2/02; C21D9/46; C22C38/00; C22C38/06; C22C38/60; C23C2/06; C23C28/00; C23G1/08

JP2015180766A	2015-10-15
JP2003328099A	2003-11-19
JP2012172230A	2012-09-10
JP2004149912A	2004-05-27
JP2000290730A	2000-10-17
JP2007239012A	2007-09-20
JP3956550B2	2007-08-08
JP2015551886A	2015-06-15

See also references of EP 3626849A4

KUMASAKA Akira et al. (JP)

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