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Picture for What’s Wrong With ASTM G48 Qualification Test in Duplex SS Welds?
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What’s Wrong With ASTM G48 Qualification Test in Duplex SS Welds?

Product Number: 51319-13118-SG
Author: Marco De Marco
Publication Date: 2019
$20.00

The application of Corrosion Resistant Alloys (CRA) in harsh environments and severe services is gaining a leading position across the Industry. Among the different CRA Duplex & Superduplex stainless steels (DSS) represent an often-interesting choice in terms of cost-benefit ratio. Duplex and superduplex stainless steels as a matter of fact offer a competitive cost excellent corrosion resistance in many environments and good mechanical properties; they are often replacing and upgrading traditional stainless steels by closing the application gap with more noble alloys such as nickel and copper alloys. The quality control of DSS fabrications that involve welded joints cannot underestimate the possible influence of the welding process itself on the localized corrosion resistance of the material. Such alloys are characterized by a somewhat complex metallurgy which involves during welding the possible precipitation of undesirable phases & compounds that can induce an important loss of corrosion resistance in particular considering localized corrosion phenomena (e.g. pitting corrosion).During welding and materials qualification steps the most commonly specified test for checking localized corrosion resistance of CRA in particular in chloride-containing environments is the Ferric chloride ASTM G48 [1] corrosion test. So many End-User material & fabrication specifications have taken up this procedure by incorporating it and often customizing it. This is because the procedure described in the ASTM standard does not cover or define in detail many particular aspects of the test itself. This creates a number of free interpretations of the test procedure that can be associated with more or less severe test conditions and more or less easy-to-reach requirements. It can be useful to remember that the test itself is in any case not a real fitness for purpose test but more a quality control one; it is carried out under very severe conditions often more severe than the actual conditions in which components will be exposed. This also means that even small variations in the test procedure welding variables or welding metallurgy can tip the balance in the pass/fail equilibrium. The purpose of this work is to describe some fundamental aspects of test procedure and results evaluation somehow customizable with respect to the ASTM standard which may influence the test outcome itself also considering a possible review of the standard toward a more unified procedure. In this context taking into account that manufacturers find themselves in need to optimize the welding process with the aim to overcome G48 corrosion test during qualification the work also describes typical issues related to welding that could induce a negative verdict of ferric chloride pitting test.

Picture for What Test Environment for the Qualification of OCTG Sour Service Grades? Means and Consequences of pH Control
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What Test Environment for the Qualification of OCTG Sour Service Grades? Means and Consequences of pH Control

Product Number: 51321-16283-SG
Author: Florian Theabault; Christelle Gomes; Julien Pennequin; Harve Marchebois
Publication Date: 2021
$20.00
What is So Special About Nuclear Coatings?
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	Picture for Wet CO-CO2 Stress Corrosion Cracking in CCS Pipelines
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Wet CO-CO2 Stress Corrosion Cracking in CCS Pipelines

Product Number: 51324-20669-SG
Author: Manoj Gonuguntla; Aruna V T; Johannes Sonke; Guruprasad Sundararajan
Publication Date: 2024
$40.00
Carbon capture and sequestration (CCS) is gaining greater importance in the industry transition to meet climate goals reducing carbon intensity. As the source of CO2 captured for sequestration widens to many more applications from oil and gas productions, power plants, refineries, chemical plants, steel manufacturing and other industries, the composition of the captured gas stream for sequestration sees various components. Some of the common impurities particularly from combustion processes are carbon monoxide, oxygen, SOx, NOx and others. Understanding the effect of presence of the various chemical species on material limits and maximum tolerance limits are crucial for safe operations of the assets. In one of the recent projects, there was a presence of CO in the CO2 stream, and it was imperative to identify the effect of this on the existing carbon steel pipeline. The pipeline was of X65 steel and fabricated for natural gas transmission. Wet CO-CO2 cracking is a reported degradation mode particularly as the CO concentration increases beyond 200 ppm in the gas phase or at partial pressures above 0.3 bar. This study is a combination of literature review of current state of art with respect to CO-CO2 cracking in carbon steel in presence of impurities and laboratory testing of welded X65 specimens exposed to CO concentration in dense (liquid) phase up to 1000 ppm and also in the presence of small concentrations of oxygen that also replicates some of the expected conditions in the project. The tests clearly indicate that the risk of CO-CO2 cracking is not significant up to the concentrations tested.
Picture for Welding Procedure Development For A 13Cr-5Ni-2Mo (UNS S41426) Super Martensitic Stainless Steel
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Welding Procedure Development For A 13Cr-5Ni-2Mo (UNS S41426) Super Martensitic Stainless Steel

Product Number: 51321-16840-SG
Author: Thanh Nam Vu; Karthik Krishnan; John Sisk
Publication Date: 2021
$20.00
Picture for Welding Of CRA With Insufficient Purging Gas Impact On Mechanical Properties And Corrosion Resistance
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Welding Of CRA With Insufficient Purging Gas Impact On Mechanical Properties And Corrosion Resistance

Product Number: 51321-16615-SG
Author: Kristian Eriksen/ Roy Johnsen/ Stian Hauger
Publication Date: 2021
$20.00