公开(公告)号：US20150013716A1

公开(公告)日：2015-01-15

申请号：US14372912

申请日：2013-01-16

Applicant: JFE STEEL CORPORATION

Inventor： Hiroyuki Masuoka ,  Satoru Ando ,  Shigeyuki Aizawa ,  Kazuki Nakazato ,  Shoichiro Taira

IPC: C23G1/08

CPC classification number: C23G1/08 ,  C21D8/02 ,  C21D8/0278 ,  C21D9/562 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23G1/00 ,  C23G1/081 ,  C23G1/085 ,  C23G1/086

Abstract: In a method for prevention of yellowing on a surface of a steel sheet subjected to re-pickling, washing with water and drying after a surface of a continuously annealed steel sheet is pickled to remove Si-containing oxide layer from a surface layer of the steel sheet, the surface of the steel sheet is held at a wet state between the pickling and the re-pickling and between the re-pickling and the washing, and more preferably the washing is carried out with water having an iron ion concentration decreased to not more than 20 g/L, whereby the yellowing on the surface of the steel sheet after the pickling is prevented. Thus, cold rolled steel sheets being excellent in not only the appearance quality but also the phosphatability and corrosion resistance after painting are manufactured stably.

Abstract translation: 在经过再次酸化的钢板表面防止黄化的方法中，在连续退火钢板的表面被酸洗后，用水洗涤并干燥以从钢的表面层除去含Si氧化物层 在酸洗和再酸洗之间以及再酸洗和洗涤之间，钢板的表面处于湿润状态，更优选地，用铁离子浓度降低至不是的水进行洗涤 大于20g / L，从而防止酸洗后钢板表面发黄。 因此，不仅稳定地制造在外观品质上优异且涂装后的耐磷化性和耐腐蚀性优异的冷轧钢板。

公开(公告)号：US09631250B2

公开(公告)日：2017-04-25

申请号：US14383008

申请日：2013-02-28

Applicant: JFE STEEL CORPORATION

Inventor： Hidetaka Kawabe ,  Takeshi Yokota ,  Reiko Sugihara ,  Shigeyuki Aizawa ,  Kazuki Nakazato

IPC: C21D8/02 ,  C22C38/14 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D8/04 ,  C21D9/48 ,  C21D1/25 ,  C21D1/26

CPC classification number: C21D8/0263 ,  C21D1/25 ,  C21D1/26 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: A steel sheet has a microstructure including ferrite phase: 40% to 60%, bainite phase: 10% to 30%, tempered martensite phase: 20% to 40%, and retained austenite phase: 5% to 20% by volume fraction, and satisfying a condition that a ratio of tempered martensite phase having major axis length ≦5 μm to a total volume fraction of the tempered martensite phase is 80% to 100%.

公开(公告)号：US20150034219A1

公开(公告)日：2015-02-05

申请号：US14383008

申请日：2013-02-28

Applicant: JFE STEEL CORPORATION

Inventor： Hidetaka Kawabe ,  Takeshi Yokota ,  Reiko Sugihara ,  Shigeyuki Aizawa ,  Kazuki Nakazato

IPC: C21D8/02 ,  C22C38/14 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C21D1/26 ,  C22C38/06

CPC classification number: C21D8/0263 ,  C21D1/25 ,  C21D1/26 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: A steel sheet has a microstructure including ferrite phase: 40% to 60%, bainite phase: 10% to 30%, tempered martensite phase: 20% to 40%, and retained austenite phase: 5% to 20% by volume fraction, and satisfying a condition that a ratio of tempered martensite phase having major axis length ≦5 μm to a total volume fraction of the tempered martensite phase is 80% to 100%.

Abstract translation: 钢板具有包含铁素体相的组织：40％〜60％，贝氏体相：10％〜30％，回火马氏体相：20％〜40％，残留奥氏体相：5体积％〜20体积％，以及 满足以下条件：具有长径比长度为nlE的回火马氏体相与回火马氏体相的总体积分数相比为80％至100％的条件。