Steel pipe for fuel injection pipe and method for producing the same

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United States of America

PATENT NO 11203793
APP PUB NO 20180171426A1
SERIAL NO

15736002

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Abstract

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A steel pipe for fuel injection pipe has a tensile strength of 500 to 900 MPa and a yield ratio of 0.50 to 0.85, and has a critical internal pressure (IP) satisfying [IP≥0.41×TS×α] (α=[(D/d)2−1]/[0.776×(D/d)2], where TS: tensile strength (MPa) of the steel pipe, D: steel pipe outer diameter (mm), and d: steel pipe inner diameter (mm)), wherein a circumferential-direction residual stress on an inner surface of the pipe is −20 MPa or lower after the steel pipe is split in half in a pipe axis direction.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kondo, Hiroaki Shizuoka, JP 45 441
Makino, Taizo Tokyo, JP 20 67
Masuda, Tatsuya Shizuoka, JP 19 240
Nagao, Katsunori Tokyo, JP 13 214
Yamazaki, Masahiro Tokyo, JP 124 995
Yamazaki, Tsugumi Shizuoka, JP 2 4

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