Invention Grant
- Patent Title: Manufacturing method for a steel pipe for fuel injection pipe
- Patent Title (中): 燃油喷射管钢管的制造方法
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Application No.: US12649075Application Date: 2009-12-29
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Publication No.: US08795450B2Publication Date: 2014-08-05
- Inventor: Shoichiro Usui , Katsunori Nagao
- Applicant: Shoichiro Usui , Katsunori Nagao
- Applicant Address: JP Shizudoka JP Osaka
- Assignee: Usui Kokusai Sangyo Kaisha,Sumitomo Metal Industries, Ltd.
- Current Assignee: Usui Kokusai Sangyo Kaisha,Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Shizudoka JP Osaka
- Agency: Marshall, Gerstein & Borun LLP
- Priority: JP2007-180409 20070710
- Main IPC: F16L9/00
- IPC: F16L9/00 ; B21C37/06

Abstract:
There is provided a steel pipe for fuel injection pipe that assures prolonged fatigue life and high reliability by securing a high critical internal pressure, at which fatigue fracture does not occur, while the material strength is high. A steel pipe for fuel injection pipe consisting of, by mass percent, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, and Mn: 0.8 to 2.0%, the balance being Fe and impurities, the impurities containing Ca: 0.001% or less, P: 0.02% or less, and S: 0.01% or less, wherein the tensile strength thereof is not lower than 900 N/mm2, and the maximum diameter of a nonmetallic inclusion present during at least 20 μm depth from the inner surface of the steel pipe is not larger than 20 μm. Further, this steel pipe can contain one or more kinds of Cr: 1% or less, Mo: 1% or less, Ti: 0.04% or less, Nb: 0.04% or less, and V: 0.1% or less.
Public/Granted literature
- US20100167086A1 STEEL PIPE FOR FUEL INJECTION PIPE AND MANUFACTURING METHOD THEREFOR Public/Granted day:2010-07-01
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