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1. Introduction

High-strength HFW line pipe of API X70 and/or X80 grade is acceptable for use in extremely demanding and severe environments [10, 11]. However, in practical applications, fatigue is a main failure mode for gas transmission pipes because of the wave loading caused by daily fluctuations in pressure, such as working pressure, that stop and start Austenite Grain Growth Kinetics in API X65 and X70 Line The aim of the present work is to investigate the microstructural behavior of austenite grain size (AGS) during the reheating process of two different API steel grades (X65 and X70). The steel samples were austenitized at 1150°C, 1200°C, and 1250°C for various holding times from 10 to 60 minutes and quenched in ice water. The samples were then annealed at 500°C for 24 hours to reveal the

Bright Mild Steel VS Bright Stainless Steel - News - News

Feb 20, 2021 · Bright Mild Steel VS Bright Stainless Steel. Bright steel refers to the steel bar with a bright surface without rolling defects and decarburized layer. It is made from annealed hot rolled steel through cold drawing, peeling, polishing and other surface treatment, Low-Cycle Fatigue Properties of the X70 High-Frequency

  • AbstractIntroductionExperiment ProceduresResultsDiscussionConclusionsData AvailabilityAcknowledgmentsThe strength, toughness, corrosion, and fatigue resistance are the main requirements for evaluating the integrity of a pipeline. In this study, the tensile strength, impact toughness, and fatigue properties of the pipe body and weld joint of an X70 high-frequency electric-resistant welded (HFW) pipe were measured and the effects of microstructure and surface defects at weld joint on properties were discussed. Results show the appearance of a weakened zone at the weld joint of the X70 HFW pipe. Nevertheless, all meThe effect of welded joint repair on a corroded pipeline Dec 01, 2020 · Samples used in the present investigation was API 5L X70 steel pipe, applied to high-pressure gas transportation. The steel average chemical composition is presented in table 1. The pipelines were formed using spiral welding process with 1066.8 mm Multiphase-flow-induced corrosion and cavitation-erosion Jul 15, 2020 · Due to high mass-loss rates resulting from internal corrosion, the knowledge of the corrosion resistance of API 5L 65, X70 and X80 steels used in pipelines for sweet service is necessary . In addition to the corrosion processes, the effects of the flow in the drilling pipe are also generally ignored.

    News - API 5L Line Pipe, Foam Insulated Piping, Gas

    Nov 27, 2019 · Ferritic stainless steels contain more chromium than Austenitic stainless steels, are less costly and can be used as an alternative material to the 304 or 200 series stainless steels sometimes. According to the chromium content, it can be divided into three groups:Cr10% ~ 15%, Cr16% ~ 20% and Cr21% ~ 30%. 10% -14% Cr:409410L. Prediction of mechanical properties of welded steel X70 Sep 01, 2020 · The tensile properties of the base metal (BM) API X70 that were measured are yield strength (YS), ultimate tensile strength (UTS), elongation (El), and the yield to tensile ratio (YTR =YS/UTS). However, the ultimate tensile strength (UTS w) of the welded joint was measured as suggested by API 5L . Yield strength tracking of UOE pipe considering various Nov 01, 2019 · The considered steel is API 5L X70 (yield strength = 552 MPa) and the whole process is simulated for a final pipe with diameter D = 508 mm, thickness t = 15.875 mm, and an expansion ratio of 1.0%. Fig. 5 plots the values of the yield strength of the API 5L X70 pipe tracked by the program from the raw material to the flattening. These values

    Federal Register ::Pipeline Safety:Girth Weld Quality

    Mar 24, 2010 · Operators should verify that field Start Printed Page 14245 practices are conforming to API 5L, API 1104, ASME B31.4 or ASME B31.8 and operator procedures for weld bevel, pipe alignment, back welding, and transitions. If any bends are cut, the operator must have procedures to ensure that the pipe or bend cut ends are acceptable for welding in