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Search Results (5)

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Keywords = ERW pipe

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15 pages, 7104 KiB  
Article
Mechanical Characterization of Resistance-Welded and Seamless API 5L X52 Pipes: A Comparative Study
by Gerardo Terán Méndez, Selene Irais Capula-Colindres, Julio César Velázquez, Daniel Angeles-Herrera, Noé Eliseo González-Arévalo, Esther Torres-Santillan and Arturo Cervantes-Tobón
Coatings 2024, 14(3), 343; https://doi.org/10.3390/coatings14030343 - 13 Mar 2024
Viewed by 1117
Abstract
It is well known that the mechanical properties of a steel plate depend on the anisotropy of the material and the rolling directions. This paper presents the results of the Charpy V-Notch (CVN) impact test for the ST, TL, TS, LS, LT, 45°, [...] Read more.
It is well known that the mechanical properties of a steel plate depend on the anisotropy of the material and the rolling directions. This paper presents the results of the Charpy V-Notch (CVN) impact test for the ST, TL, TS, LS, LT, 45°, and SL directions in API 5L X52 pipelines with electric-resistance-welded (ERW) and seamless (SMLS) pipes. Charpy specimens were manufactured and tested according to the ASTM E23 standard in laboratory conditions. All possible directions in the pipe were tested. Three Charpy specimens were tested for each direction, for a total of 21 Charpy tests. Moreover, the microstructures, hardness, ductile and brittle areas, and fracture surfaces of the Charpy specimens are presented in this research. The results show that the Charpy energy values, hardness, and microstructures depend on the direction of the specimens. The Charpy values of the SMLS pipe are higher than those of the ERW pipe because of several metallurgical factors, such as grain size, non-metallic inclusions, delaminations, and microstructures. Full article
(This article belongs to the Section Corrosion, Wear and Erosion)
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17 pages, 20692 KiB  
Article
Oil-Pipe Cracking and Fitness-for-Service Assessment
by Jin-Heng Luo, Li-Feng Li, Li-Xia Zhu, Liang Zhang, Gang Wu and Xin-Wei Zhao
Metals 2022, 12(8), 1236; https://doi.org/10.3390/met12081236 - 22 Jul 2022
Cited by 2 | Viewed by 1688
Abstract
A new D457 × 7.1 X65ERW oil pipeline leaked twice during the pressure test. The two failed oil pipes belonged to the same batch of products from the same manufacturer. Failure analysis showed that the cracks in the 1# and 2# cracking pipes [...] Read more.
A new D457 × 7.1 X65ERW oil pipeline leaked twice during the pressure test. The two failed oil pipes belonged to the same batch of products from the same manufacturer. Failure analysis showed that the cracks in the 1# and 2# cracking pipes propagated from the outer surface of the pipe wall to the inner surface along the weld fusion line. The inclusion phase distributed in chains in the weld zone is speculated to be the root cause of the cracking in the pressure test. The fitness-for-service of this batch of steel pipes was analyzed using the failure-assessment chart technique. The batch of steel pipes could be used safely under the design pressure of 10 MPa, and the re-evaluation period of three years was recommended for the pipeline based on the fatigue results of the steel-pipe weld zone. Full article
(This article belongs to the Special Issue Failure Analysis in Metallic Materials)
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17 pages, 5202 KiB  
Article
Effect of Strain Hardening on Increase in Collapse Pressure during the Manufacture of ERW Pipe
by Seong-Wook Han, Yeun Chul Park, Ho-Kyung Kim and Soo-Chang Kang
Appl. Sci. 2020, 10(14), 5005; https://doi.org/10.3390/app10145005 - 21 Jul 2020
Cited by 4 | Viewed by 3221
Abstract
Plastic deformation during the manufacture process of electric resistance welded (ERW) pipe determines the stress–strain relationship of the steel pipe, which affects the collapse pressure of offshore pipelines. To track the deformation history of the pipe, the entire process was simulated via finite [...] Read more.
Plastic deformation during the manufacture process of electric resistance welded (ERW) pipe determines the stress–strain relationship of the steel pipe, which affects the collapse pressure of offshore pipelines. To track the deformation history of the pipe, the entire process was simulated via finite element analysis using a solid element. A material model that considered both the Bauschinger effect and strain hardening was adopted. Various sizes of pipe cross-sections were simulated. As greater compression was applied during the sizing process, the strain hardening effect became more significant, so that the compressive yield strength was increased in the circumferential direction. The strain hardening effect was most prominent for a smaller diameter-to-thickness ratio (D/t), so that an increase in the collapse pressure could be obtained with a larger sizing ratio. Therefore, current design criteria for the collapse pressure recommended by Det Norske Verita (DNV) and API could be enhanced for a smaller D/t to consider the strain hardening effect during the sizing process. Full article
(This article belongs to the Special Issue Advances on Structural Engineering)
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16 pages, 5218 KiB  
Article
Collapse Analysis of ERW Pipe Based on Roll-Forming and Sizing Simulations
by Seong-Wook Han, Yeun Chul Park, Soo-Chang Kang, Sungmoon Jung and Ho-Kyung Kim
J. Mar. Sci. Eng. 2019, 7(11), 410; https://doi.org/10.3390/jmse7110410 - 12 Nov 2019
Cited by 6 | Viewed by 4247
Abstract
The demand for electric resistance welded (ERW) pipe for deep-water installation has increased, which necessitates a higher degree of accuracy in evaluating the strength of pipe in order to satisfy the design limit state, otherwise referred to as the collapse performance. Since ovality [...] Read more.
The demand for electric resistance welded (ERW) pipe for deep-water installation has increased, which necessitates a higher degree of accuracy in evaluating the strength of pipe in order to satisfy the design limit state, otherwise referred to as the collapse performance. Since ovality and residual stress governs the collapse performance, an accurate evaluation of these factors is needed. An analytical approach using a three-dimensional finite element method was proposed to simulate the roll-forming and sizing processes in manufacturing ERW pipe. To simulate significant plastic deformation during manufacturing, a nonlinear material model that included the Bauschinger effect was incorporated. The manufacturing of ERW pipe made of API 5L X70 steel was simulated and analyzed for collapse performance. Controlling the ovality of the pipe significantly decreased the amount of pressure that would cause a collapse, whereas the effect of residual stress was minor. These two factors could be improved via the use of a proper sizing ratio. Full article
(This article belongs to the Section Ocean Engineering)
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5019 KiB  
Article
Microstructure and Mechanical Properties of J55ERW Steel Pipe Processed by On-Line Spray Water Cooling
by Zejun Chen, Xin Chen and Tianpeng Zhou
Metals 2017, 7(4), 150; https://doi.org/10.3390/met7040150 - 23 Apr 2017
Cited by 8 | Viewed by 7405
Abstract
An on-line spray water cooling (OSWC) process for manufacturing electric resistance welded (ERW) steel pipes is presented to enhance their mechanical properties and performances. This technique reduces the processing needed for the ERW pipe and overcomes the weakness of the conventional manufacturing technique. [...] Read more.
An on-line spray water cooling (OSWC) process for manufacturing electric resistance welded (ERW) steel pipes is presented to enhance their mechanical properties and performances. This technique reduces the processing needed for the ERW pipe and overcomes the weakness of the conventional manufacturing technique. Industrial tests for J55 ERW steel pipe were carried out to validate the effectiveness of the OSWC process. The microstructure and mechanical properties of the J55 ERW steel pipe processed by the OSWC technology were investigated. The optimized OSWC technical parameters are presented based on the mechanical properties and impact the performance of steel pipes. The industrial tests show that the OSWC process can be used to efficiently control the microstructure, enhance mechanical properties, and improve production flexibility of steel pipes. The comprehensive mechanical properties of steel pipes processed by the OSWC are superior to those of other published J55 grade steels. Full article
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
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