Title:
METHOD FOR PRODUCING HIGH STRENGTH HOT DIP GALVANIZED STEEL SHEET
Document Type and Number:
Japanese Patent JP3911972
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a high strength hot dip galvanized steel sheet by which excellent ductility can be imparted.
SOLUTION: In this method for producing a high strength hot dip galvanized steel sheet, steel having a composition containing, by mass, 0.01 to 0.3% C, ≤0.7% Si, 1 to 3% Mn, ≤0.08% P, ≤0.01% S, ≤0.08% sol.Al and ≤0.O07% N is hot-rolled at ≥Ar3 point, within 2.5 sec, the steel is cooled by rapid cooling at the average cooling rate of ≥100°C/sec to >500 to 700°C, is thereafter coiled and is subsequently pickled or is further cold-rolled, and, in continuous hot dip galvanizing equipment, annealing is performed at ≥720°C. Moreover, steel further containing one or more kinds selected from 0.005 to 0.5% Nb and Ti and 0.0002 to 0.005% B or one or more kinds selected from 0.01 to 1% V, Cr and Mo is used.
Inventors:
Yasunobu Nagataki
Tadashi Inoue
Sadanori Imada
Tadashi Inoue
Sadanori Imada
Application Number:
JP2000216316A
Publication Date:
May 09, 2007
Filing Date:
July 17, 2000
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21D9/46; C22C38/00; C22C38/06; C22C38/38; (IPC1-7): C21D9/46; //C22C38/00; C22C38/06; C22C38/38
Domestic Patent References:
| JP63286523A | ||||
| JP7054051A | ||||
| JP6264139A | ||||
| JP6279853A | ||||
| JP6299236A | ||||
| JP8176723A | ||||
| JP10195588A | ||||
| JP4002717A | ||||
| JP4088125A |
Foreign References:
| WO2000055381A1 |
Attorney, Agent or Firm:
Kenichiro Ochiai
Kazuhiro Mori
Kazuhiro Mori