API X80 grade induction bend pipe was developed using longitudinally submerged arc welded pipe as a mother pipe and applying subsequent quenching after induction heating and tempering in the full length portion. As a preliminary study for optimizing manufacturing process, the effect of heating process in induction bending had been investigated, and full length quenching and tempering process was recommended in order to obtain satisfying strength as X80 grade and superior toughness for the bend portion and tangent, as well. Based on the above examination, API X80 grade induction bend pipe with the pipe size of 761.0mmOD × 20.7mmWT, bending radius of three times the pipe diameter and bending angle of 90 degree, was manufactured by applying the full length quenching and tempering process, using a UOE pipe which has relatively lower chemistry with Ceq of 0.44%. It was proved that the trial X80 bend pipe has sufficient tensile properties for all portion in the transverse and longitudinal direction, measured by round bar tensile specimens. However, by using API standard full-thickness specimen, yield strength of all portion in the transverse direction and yield strength of the intrados in the longitudinal direction showed lower value than those obtained by round bar specimens because of the Bauschinger effect caused by flattening of the specimen. Owing to low chemistry of the mother pipe and optimized induction bending condition, the bend portion as well as the tangent showed quite low Charpy transition temperature and large absorbed energy even under −60 °C, and superior toughness was also achieved in the seam weldment.
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ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
June 23–28, 2002
Oslo, Norway
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3613-4
PROCEEDINGS PAPER
Development of X80 Grade Induction Bend Pipe
Nobuyuki Ishikawa,
Nobuyuki Ishikawa
NKK Corporation, Fukuyama, Japan
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Shigeru Endo,
Shigeru Endo
NKK Corporation, Fukuyama, Japan
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Masaaki Takagishi
Masaaki Takagishi
Dai-ichi High Frequency Company, Ltd., Kawasaki, Japan
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Nobuyuki Ishikawa
NKK Corporation, Fukuyama, Japan
Shigeru Endo
NKK Corporation, Fukuyama, Japan
Joe Kondo
NKK Corporation, Fukuyama, Japan
Masaaki Takagishi
Dai-ichi High Frequency Company, Ltd., Kawasaki, Japan
Paper No:
OMAE2002-28182, pp. 121-128; 8 pages
Published Online:
February 24, 2009
Citation
Ishikawa, N, Endo, S, Kondo, J, & Takagishi, M. "Development of X80 Grade Induction Bend Pipe." Proceedings of the ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3. Oslo, Norway. June 23–28, 2002. pp. 121-128. ASME. https://doi.org/10.1115/OMAE2002-28182
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