Invention Grant
- Patent Title: Method for manufacturing surface treated steel material using a chemical conversion treatment liquid
- Patent Title (中): 使用化学转化处理液制造表面处理钢材的方法
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Application No.: US10771294Application Date: 2004-02-05
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Publication No.: US07918945B2Publication Date: 2011-04-05
- Inventor: Masaru Izawa , Kunio Goto
- Applicant: Masaru Izawa , Kunio Goto
- Applicant Address: JP Osaka
- Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Osaka
- Agency: Clark & Brody
- Priority: JP2001-050740 20010226; JP2001-368776 20011203
- Main IPC: C23C22/08
- IPC: C23C22/08 ; C23C22/00
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.
Public/Granted literature
- US20040154700A1 Surface treated steel material, a method for its manufacture, and a chemical conversion treatment liquid Public/Granted day:2004-08-12
Information query
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