Title:
METHOD FOR MANUFACTURING HIGH STRENGTH COLD ROLLED STEEL SHEET EXCELLENT IN CHEMICAL CONVERSION TREATMENT PROPERTY AND CORROSION RESISTANCE AFTER COATING
Document Type and Number:
Japanese Patent JP2015089946
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a high strength cold rolled steel sheet excellent in chemical conversion treatment property and corrosion resistance after coating.SOLUTION: A cold rolled steel sheet containing 0.5 to 2.0 mass% of Si is heating annealed under non-oxidative atmosphere, a surface of the cold rolled steel sheet is dissolved at 0.5 g/mor more by acid cleaning, and then electric plating of a Zn-Fe alloy having the Fe percentage content of 50 wt.% to 98 wt.% is performed with a coating weight of 1000 to 5000 mg/m. The heating annealing is at a heating temperature of 900°C or less, the non-oxidative atmosphere is obtained by introducing a mix gas of nitrogen and hydrogen, and the content of hydrogen in the non-oxidative atmosphere is preferably 10 vol.% or less.
Inventors:
TAIRA SHOICHIRO
TANIMOTO WATARU
TANIMOTO WATARU
Application Number:
JP2013228978A
Publication Date:
May 11, 2015
Filing Date:
November 05, 2013
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
C25D5/26; C21D9/46; C23C28/00
Domestic Patent References:
| JP2012167362A | 2012-09-06 | |||
| JPS56133488A | 1981-10-19 | |||
| JPS621898A | 1987-01-07 | |||
| JP2013127093A | 2013-06-27 | |||
| JP2007262554A | 2007-10-11 |
Attorney, Agent or Firm:
Shigeru Inoue
Kazuhiro Mori
Kazuhiro Mori
Previous Patent: FACILITIES FOR RESOURCE-RECYCLING BIOTECHNICAL HYDROGEN PRODUCTION FROM BIOMASS
Next Patent: METHOD FOR RECOVERING NOBLE METAL
Next Patent: METHOD FOR RECOVERING NOBLE METAL