Title:
PRODUCTION OF P-CONTAINING HIGH STRENGTH GALVANIZED STEEL SHEET AND HIGH STRENGTH GALVANNEALED STEEL SHEET
Document Type and Number:
Japanese Patent JP3480348
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a galvanized steel sheet excellent in uniformity and stickiness of a coated film, and a producing method, with which a galvannealed steel sheet without generating uneven alloying and excellent in powdering resistance can stably be produced.
SOLUTION: In this producing process of a high strength galvanized steel sheet, with which the high strength steel sheet containing by wt.% ≥0.02% P and/or ≥0.2% Mn, is heated and annealed under non-oxidizing atmosphere and thereafter, dipped into a galvanizing bath containing Al to execute the galvanizing, or the producing process of the high strength galvannealed steel sheet further executing the alloying heat treatment of the galvanized coating, a coating composed of one or more kinds selected among metallic compounds of Ni, Co, Sn and Cu base in the range of 1-200 mg/m2 as an amount converted into the metallic quantity, is stuck on the surface of the steel sheet prior to annealing.
Inventors:
Shoichiro Taira
Yoshiharu Sugimoto
Michitaka Sakurai
Masaru Sagiyama
Hisato Noro
Etsuo Hamada
Yoshiharu Sugimoto
Michitaka Sakurai
Masaru Sagiyama
Hisato Noro
Etsuo Hamada
Application Number:
JP1027999A
Publication Date:
December 15, 2003
Filing Date:
January 19, 1999
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C23C2/02; C23C2/06; (IPC1-7): C23C2/02; C23C2/06
Domestic Patent References:
| JP10287961A | ||||
| JP8188861A | ||||
| JP6254069A | ||||
| JP11293438A |
Attorney, Agent or Firm:
Yasumitsu Nakahama