Title:
高強度溶融亜鉛めっき鋼板の製造方法
Document Type and Number:
Japanese Patent JP6673290
Kind Code:
B2
Abstract:
An object is to provide a method for manufacturing a high-strength galvanized steel sheet excellent in terms of strength-elongation balance, coating adhesiveness, and surface appearance.A first heating process of heating a steel sheet having a predetermined chemical composition to a temperature range of 800°C or higher and 950°C or lower in an atmosphere having a H2concentration of 0.05 vol% or more and 30.0 vol% or less and a dew point of 0°C or lower, a first pickling process of pickling the steel sheet which has been subjected to the first heating process in an oxidizing acidic aqueous solution and of rinsing the pickled steel sheet in water, a second pickling process of pickling the steel sheet which has been subjected to the first pickling process in a non-oxidizing acidic aqueous solution and of rinsing the pickled steel sheet in water, a second heating process of holding the steel sheet which has been subjected to the second pickling process in a temperature range of 700°C or higher and 900°C or lower in an atmosphere having a H2concentration of 0.05 vol% or more and 30.0 vol% or less and a dew point of 0°C or lower for 20 seconds or more and 300 seconds or less, and a process of performing a galvanizing treatment on the steel sheet which has been subjected to the second heating process are performed.
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Inventors:
Terashima Shotaro
Yusuke Fushiwaki
Makimizu Yoichi
Hiroyuki Masuoka
Hiroshi Hasegawa
Yusuke Fushiwaki
Makimizu Yoichi
Hiroyuki Masuoka
Hiroshi Hasegawa
Application Number:
JP2017099448A
Publication Date:
March 25, 2020
Filing Date:
May 19, 2017
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C23C2/02; C21D9/46; C22C38/00; C22C38/06; C22C38/60; C23C2/06; C23C28/00; C23G1/08
Domestic Patent References:
| JP2015180766A | ||||
| JP2003328099A | ||||
| JP2012172230A | ||||
| JP2004149912A | ||||
| JP2000290730A | ||||
| JP2007239012A |
Attorney, Agent or Firm:
Isomura Tetsuro
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori