... ABSTRACT In this paper, basic material behavior and mechanical properties of linepipe steel under high pressure hydrogen were investigated. Hydrogen exposure test was first conducted to evaluate hydrogen absorption into the steel from gaseous hydrogen up to 25MPa. It was found that around...

... ABSTRACT Material design concept to improve HIC resistance of linepipe steels based on PHIC parameter, which describes hardenability of center segregation region was developed with theoretical consideration to partitioning of solute elements in the liquid/solid phase. By using P HIC parameter...

... Abstract Grade X80 with 29.6mm thick linepipe with excellent low-temperature toughness down to -45 degrees C or less was developed. Good balance of Drop Weight Tear Test (DWTT) properties applicable to the design temperature of -45 degrees C and high Charpy V-Notched (CVN) absorbed energy...

... of the linepipe subject to large plastic strains during reeling, installation fatigue and service conditions. It is concluded that reel lay of an LSAW linepipe with sporadic low CTOD values can be accepted on a case by case basis driven by service requirement for the pipeline. Industry guidance is required...

... initiation characteristic from the damage part used as the reason of crack propagation. There are few examples which evaluated the ductile fracture initiation limit, that is, Leak/Rupture limit for high strength linepipe in recent years. This paper describes the effect of damage morphology on fracture...

... and analysis of the microscopic deformation behavior, a plastic instability condition of ferrite-bainite dual-phase steels was estimated. linepipe dual-phase steel ferrite-bainite steel bainite phase deformation behavior equivalent plastic strain microstructure ferrite phase strain hardenability...

... Abstract Grade X80 heavy gauge linepipe with excellent low-temperature toughness was developed. Good balance of low-temperature toughness applicable to the design temperature of −45 degree C and high Charpy absorbed energy of over 350J were achieved by the optimized rolling condition...

... Steel Research Laboratory, JFE Steel Corporation, Kawasaki-ku, Kawasaki, Japan 3 Steel Research Laboratory, JFE Steel Corporation, Chiba, Japan ABSTRACT Linepipe with the dual-phase steel of bainite and dispersed MA (martensite-austenite constituent) phases has been applied for many pipelines...

... 1. ABSTRACT Grade X80-X100 high strength and high strain linepipes have been developed through the advanced thermo-mechanical controlled processing (TMCP) with the combination of accelerated cooling (Super-OLAC™, Super-OLAC™-A) and heat treatment on-line process (HOP™). Developed X80-X100...

... ABSTRACT This paper presents the basic wall thickness design requirements for the Middle East to India Deepwater Pipeline (MEIDP) and tracks the production and subsequent ring collapse testing of this linepipe suitable for 3500m water depth. The test program showed that the ring testing method...

... a pipeline to accommodate longitudinal strains above 0.5% due to differential soil movement requires use of strain-based design (SBD) in addition to conventional working stress design that sets the pipeline minimum wall thickness to withstand internal pressure. linepipe requirement midstream oil...

... Influence of Plastic Deformation on Measured Pipe Tensile Properties and the Consequence for Design Philippe Thibaux OCAS NV Zelzate, Belgium . ABSTRACT The properties of linepipes are measured by tensile tests in the main loading direction. The designer can on the base of this information assess...

... ABSTRACT: This paper presents the results of experimental studies focused on the strain capacity of X80 linepipe. A full-scale bending test of X80 grade, girth welded 48" high-strain linepipe pressurized to 60% SMYS was conducted to investigate the compressive strain limit and tensile strain...

... and coal in combustion. There have also been needs for high strength linepipes for cost reduction in construction of longdistance pipelines. Furthermore, pipeline projects tend to be planned in severe environments such as in seismic or discontinuous permafrost areas, and deformability of linepipe has...

... simulations followed by either full scale four point bending (FPB) or small scale FPB sulfide stress cracking tests. In subsequent work (Monahan et al 2010), this same qualification method has been used to evaluate the effect of reeling strain on the SSC resistance of Grade 450 linepipe and girth welds having...

... ABSTRACT: A full-scale bending test apparatus which can bend 48" high-strain linepipes was constructed to conduct the bending tests with internal pressure. Three bending tests of X80-grade, 48" line pipes pressurized to 60% SMYS were conducted to investigate local buckling and postbuckling...

... based on X80 grade steel linepipe) Project, describing a key tool of such a Project that is the new full scale four point bend testing device specifically designed to test large diameter high grade steel gas pipeline in plastic regime. First testing results are presented and commented. INTRODUCTION...

... Material Design Concept in Heavy Wall X100 High Strength Linepipe Steel Junji Shimamura1), Mitsuhiro Okatsu1), Nobuyuki Ishikawa2), Kimihiro Nishimura1) ,Yoshiaki Murakami3), Seishi Tsuyama2) and Ryuji Muraoka4) 1) Steel Research Laboratory, JFE Steel Corporation, Kurashiki, Okayama, Japan 2...

... ABSTRACT: This paper describes a methodology for strain capacity analysis in linepipes buried in discontinuous permafrost and the predicted failure modes. The buckling resistance of the linepipes is affected by material characteristics and geometric imperfections. Stress analysis using finite...

... ABSTRACT This paper examines the influence of internal pressure on the strain capacity of pipelines in a pressurized full-scale pipe tension test and curved wide plate (CWP) tests. Finite element analysis (FEA) was also used to investigate the strain behavior of X80 linepipe under large axial...