The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Yuan Zexi - One of the best experts on this subject based on the ideXlab platform.
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influence of quenching on line on properties of X70 steel for sour service seamless pipe
Energy Procedia, 2012Co-Authors: Ling Zhongqiu, Zhou Yong, Fang Jian, Yuan ZexiAbstract:Abstract It is always hard to resolve the low strength problem of Grade X70 sour service seamless steel pipes with large diameter and heavy thickness using traditional quenching off-line, when low carbon and low alloy steel had been used to produce the pipes. In this paper, the influence of quenching on-line on the property and microstructure of such a product was reported. It was shown that the strength can be improved and good toughness can be obtained. At the same time, production cost may be reduced.
Ling Zhongqiu - One of the best experts on this subject based on the ideXlab platform.
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influence of quenching on line on properties of X70 steel for sour service seamless pipe
Energy Procedia, 2012Co-Authors: Ling Zhongqiu, Zhou Yong, Fang Jian, Yuan ZexiAbstract:Abstract It is always hard to resolve the low strength problem of Grade X70 sour service seamless steel pipes with large diameter and heavy thickness using traditional quenching off-line, when low carbon and low alloy steel had been used to produce the pipes. In this paper, the influence of quenching on-line on the property and microstructure of such a product was reported. It was shown that the strength can be improved and good toughness can be obtained. At the same time, production cost may be reduced.
Christian Coppey - One of the best experts on this subject based on the ideXlab platform.
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development of Grade X70 and x80 for sour service line pipe applications
2012 9th International Pipeline Conference, 2012Co-Authors: Thorsten Staudt, Volker Schwinn, Sven Raedersdorf, Martin Pant, Christoph Kalwa, Heiko Haverkamp, Christian CoppeyAbstract:The paper describes the results of elaborated development work and the application of the very latest technology on steel, plate and pipe making, the recent demand on Grade API-5L X70 or even API-5L X80 for specific sour service applications can be met. Furthermore the paper will point out the overall production concept which provides the fundament for the production of such steels with consistent and reliable resistance to hydrogen induced cracking (HIC). The essential parameters will be explained. This includes the utilization of an appropriate quality assurance system. Recent achievements in terms of strength level, thickness and sour service conditions will be explained.Copyright © 2012 by ASME
Zhou Yong - One of the best experts on this subject based on the ideXlab platform.
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ausforming and tempering process of Grade X70 sour service seamless pipeline
Heat Treatment of Metals, 2012Co-Authors: Zhou YongAbstract:Ausforming+tempering process and common quenching+tempering process were compared and analyzed for X70 sour service seamless pipeline with heavy diameter and thickness.The results show that the strength can be improved and the good toughness can be obtained,and then product property requirement can be completely satisfied by ausforming+tempering heat treatment.At the same time,production cost can be reduced.
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influence of quenching on line on properties of X70 steel for sour service seamless pipe
Energy Procedia, 2012Co-Authors: Ling Zhongqiu, Zhou Yong, Fang Jian, Yuan ZexiAbstract:Abstract It is always hard to resolve the low strength problem of Grade X70 sour service seamless steel pipes with large diameter and heavy thickness using traditional quenching off-line, when low carbon and low alloy steel had been used to produce the pipes. In this paper, the influence of quenching on-line on the property and microstructure of such a product was reported. It was shown that the strength can be improved and good toughness can be obtained. At the same time, production cost may be reduced.
Joe Kondo - One of the best experts on this subject based on the ideXlab platform.
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Girth Weld Strength Matching Effect on Tensile Strain Capacity of Grade X70 High Strain Line Pipe
Volume 2: Pipeline Safety Management Systems; Project Management Design Construction and Environmental Issues; Strain Based Design; Risk and Reliabili, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high Grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, strain capacity is important for the pipeline and strain based design is also needed to keep gas transportation project in safe. High Grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves strain capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study strain capacity of Grade X70 high strain pipes with size of 36″ OD and 23mm WT was investigated with two types of experiments, which are full scale pipe bending tests and curved wide plate tests. The length of the specimen of full scale bending tests were approximately 8m and girth weld was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. Test pipes were cut and welded, GTAW in first two layer and then finished by GMAW. In one pipe, YS-TS over-matching girth weld (OVM) joint was prepared considering the pipe body Grade. For the other pipe, intentionally under-matching girth weld (UDM) joint was prepared. After the girth welding, elliptical EDM notch were installed in the GW HAZ as simulated weld defect. In both pipe bending tests, the buckling occurred in the pipe body at approximately 300mm apart from the GW and after that, deformation concentrated to buckling wrinkle. Test pipe breaking locations were different in the two tests. In OVM, tensile rupture occurred in pipe body on the backside of buckling wrinkle. In UDM, tensile rupture occurred from notch in the HAZ. In CWP test, breaking location was the HAZ notch. There were significant differences in CTOD growth in HAZ notch in these tests.
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Strain Capacity Investigation on Grade X70 High Strain Line Pipe With Girth Weld
Volume 6B: Materials and Fabrication, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high Grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, strain capacity is important for the pipeline and strain based design is also needed to keep gas transportation project in safe. High Grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves strain capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study strain capacity of Grade X70 high strain pipe with size of 36” OD and 23mm WT was investigated with two types of experiments. One was a pipe bending test with whole pipe. The length of the specimen was approximately 8m and GW was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. The other test was curved wide plate (CWP) test. In both tests, test pipes were cut and welded using GTAW in the first two layers and GMAW for the subsequent passes. Welding wire of TG-S62 and MG-S58P were used for GTAW and GMAW respectively to achieve over-matching girth weld considering the pipe body strength. Elliptical EDM notch was installed in the GW HAZ as simulated weld defect. In pipe bending test, buckling occurred at the intrados at 300 mm apart from the GW. 2D average compressive strain at buckling was 3.59% and this high compressive strain was considered to derive from the high strain capacity of this pipes. After the buckling, deformation concentrated to the buckling wrinkle. Test pipe broke at 35.5 degrees of pipe end rotation and the location was in base metal at the extrados opposite to the buckling wrinkle. The HAZ notch opened and CTOD was 1.44 mm and the global strain in 2D length average strain was 7.8%. In CWP test, tensile strain simply got large and pipe finally broke at global strain of 9.6% and CTOD of 15 mm. The break location was the HAZ notch. There was a significant difference in CTOD growth in HAZ between two test types. Conditions and factors that effect to these differences are argued in this paper.
