NDLI: Grade X65 and X70 Heavy Wall (up to 37mm in Thick) UOE Linepipe for Sour Service

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nakamichi, Haruo Ishikawa, Nobuyuki Endo, Shigeru Tanizawa, Akihiko Kawanaka, Toru Kakihara, Shinichi Uchitomi, Noriaki
Copyright Year	2013
Abstract	Based on the increasing demand for natural gas to be extracted under severe environmental conditions, requirements for thicker sour service pipe steels with high strength (X65 grades or more) are increasing. In order to achieve both a resistance to hydrogen induced cracking (HIC) and better mechanical properties, it is important to obtain a homogeneous microstructure. For this purpose, we manufactured API X65 and X70 heavy wall (up to 37mm in thick) UOE linepipe for sour service utilizing an advanced thermo mechanical control process (TMCP) employing the theoretical maximum cooling rate with water (the ‘ultimate cooling rate’) and homogeneous temperature distribution in accelerated cooling. For applications in deeper water, higher pipe thickness to diameter ratio (t/D) is required. However, during pipe forming, these high ratio pipes suffer higher plastic strain in the vicinity of the surface. This plastic strain causes increasing surface hardness and HIC resistance may deteriorate. It is important to evaluate the effect on strain systematically based on the difference of microstructure morphologies. Therefore, the effect of bending strain on HIC properties was investigated through a simulated laboratory bending test with a strain of up to 8.9%. It was found that homogeneous bainitic microstructure can prevent HIC even under a higher bending strain. On the other hand, crack area ratio (CAR) was almost doubled when 5% strain was applied near the surface area in the material in which inclusion morphologies were not optimized.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791855355
DOI	10.1115/OMAE2013-10272
Volume Number	Volume 3: Materials Technology; Ocean Space Utilization
Conference Proceedings	ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2013-06-09
Publisher Place	Nantes, France
Access Restriction	Subscribed
Subject Keyword	Water American petroleum institute Cracking (materials) Temperature distribution Cooling Hydrogen Mechanical properties Fracture (materials) Steel Thermomechanics Fracture (process) Pipes Natural gas
Content Type	Text
Resource Type	Article

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