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API 5L-X65 (high-strength low-alloy plate steel)
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API 5L-X65 (high-strength low-alloy plate steel)
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001822
EISBN: 978-1-62708-241-9
... of fatigue striations all supported transit fatigue as the damage mechanism. spiral welded pipe fracture transit fatigue HSLA steel longitudinal crack magnetic particle testing cyclic hoop stress API 5L-X65 (high-strength low-alloy plate steel) Introduction A newly installed pipeline...
Abstract
A newly installed pipeline leaked during cleaning prior to hydrotest at a pressure of approximately 400 psig. The intended hydrotest pressure was 750 psig. The pipeline was constructed from spiral-welded API 5L-X65 HSLA steel and was intended for seawater injection. Analysis included nondestructive testing, metallography, and scanning electron microscopy. Based on the results, the failure was attributed to transit fatigue, caused during highway transportation. Cracks along the toes of the weld from both the outside and inside surfaces, the transgranular nature of cracking, and the presence of fatigue striations all supported transit fatigue as the damage mechanism.
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001836
EISBN: 978-1-62708-241-9
..., investigators concluded the pipe was contaminated with copper at the mill were it was produced. line pipe cracks copper contamination high-strength low-alloy pipe steel copper entrapment SEM backscattered electron analysis bend ductility API 5L X65 PSL2 (high-strength low-alloy steel...
Abstract
An investigation was conducted to determine why 16 out of 139 pipe bends cracked during hot induction bending. The pipe conformed to API 5L X65 PSL2 line pipe standards and measured 1016 mm (40 in.) in diam with a wall thickness of 18.5 mm. A metallurgical cross section was removed along a crack on the extrados to document the crack morphology using optical microscopy. In addition to cracking, golden-yellow streaks were visible at the extrados, and the composition was examined using scanning electron microscopy with energy dispersive spectroscopy. Based on the results, investigators concluded the pipe was contaminated with copper at the mill were it was produced.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001820
EISBN: 978-1-62708-180-1
... strength from American Petroleum Institute (API) grade A (207 MPa, or 30 ksi) to API 5L-X70 (483 MPa, or 70 ksi). Generally, API 5L Specification steels with yield strengths above 359 MPa (52 ksi) are microalloyed and controlled rolled to achieve the desired strength and fracture properties. Pipeline wall...
Abstract
This article describes the failure characteristics of high-pressure long-distance pipelines. It discusses the causes of pipeline failures and the procedures used to investigate them. The use of fracture mechanics in failure investigations and in developing remedial measures is also reviewed.
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
... In steels, cracking in the base metal is often attributed to high carbon, alloy content, and relatively thick material. Control of this cracking requires the use of: Low-hydrogen electrodes Low-hydrogen welding practices, such as high preheat Sufficient interpass temperature Greater...
Abstract
This article describes some of the welding discontinuities and flaws characterized by nondestructive examinations. It focuses on nondestructive inspection methods used in the welding industry. The sources of weld discontinuities and defects as they relate to service failures or rejection in new construction inspection are also discussed. The article discusses the types of base metal cracks and metallurgical weld cracking. The article discusses the processes involved in the analysis of in-service weld failures. It briefly reviews the general types of process-related discontinuities of arc welds. Mechanical and environmental failure origins related to other types of welding processes are also described. The article explains the cause and effects of process-related discontinuities including weld porosity, inclusions, incomplete fusion, and incomplete penetration. Different fitness-for-service assessment methodologies for calculating allowable or critical flaw sizes are also discussed.