The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2011
Filed:
Feb. 05, 2004
Method for manufacturing surface treated steel material using a chemical conversion treatment liquid
Applicants:
Masaru Izawa, Kobe, JP;
Kunio Goto, Kobe, JP;
Inventors:
Masaru Izawa, Kobe, JP;
Kunio Goto, Kobe, JP;
Assignee:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C 22/08 (2006.01); C23C 22/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of manufacturing a surface treated oil well pipe comprising performing chemical conversion treatment on an oil well pipe having a steel composition containing 0.5-13% Cr using a chemical conversion treatment liquid containing zinc and phosphoric acid or manganese and phosphoric acid and further containing potassium tetraborate to form a chemical conversion film of a zinc-phosphate type or a manganese phosphate type, wherein the chemical conversion treatment is carried out in the absence of fluoride ions.