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Products tagged with 'intergranular stress corrosion cracking'

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Picture for 07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic
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07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic Stainless Steel

Product Number: 51300-07094-SG
ISBN: 07094 2007 CP
Author: Paul Woollin
Publication Date: 2007
$20.00

This paper describes a Joint Industry Project designed to test existing understanding of the mechanism of sensitisation to intergranular corrosion or stress corrosion cracking (IGSCC) of welded supermartensitic stainless steels.  Existing data were reviewed and two series of welding trials and corrosion tests were undertaken.
Picture for Crack Growth Rate Testing Of Alloy 82 In BWR Environments
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Crack Growth Rate Testing Of Alloy 82 In BWR Environments

Product Number: ED22-17295-SG
Author: Johan Stjärnsäter, Katsuhiko Kumagai
Publication Date: 2022
$20.00

The nickel base weld metal Alloy 82 is used in various applications in boiling water reactors (BWRs). Applications that are vital from a safety point of view are e.g., welds between core shroud support legs and the reactor pressure vessel (RPV), and feedwater nozzle to safe end welds. Laboratory testing and service history have shown that Alloy 82 is susceptible to stress corrosion cracking (SCC) in BWR environments. However, in comparison with Alloy 182, fewer failure cases have been reported, which could be related to the higher Cr content in Alloy 82 (~ 15 vs. ~ 20 %). It is also possible that the higher frequency of SCC in Alloy 182 is related to the wider use of this weld metal, and the larger surface area exposed to reactor water. Given the lower frequency of failures in Alloy 82, the database regarding SCC in BWR environments is much larger for Alloy 182.
Picture for In-Situ Determination Of The Degree Of Sensitization In Austenitic Stainless Steels
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In-Situ Determination Of The Degree Of Sensitization In Austenitic Stainless Steels

Product Number: 51322-17805-SG
Author: Pablo M. Altamirano, Mariano A. Kappes, Martín A. Rodríguez
Publication Date: 2022
$20.00

Austenitic stainless steels are widely used in refineries and petrochemical industries due to their good combination of properties such as workability, mechanical strength and corrosion resistance. However, one of the most important problems they show, and which can lead to failures in service, is the susceptibility to intergranular corrosion and intergranular stress corrosion cracking (IGSCC). When these materials are subjected to temperatures in the range from 500 ºC to 800 °C, the precipitation of chromium-rich carbides occurs preferentially at grain boundaries (GB).
Picture for Nitrite-Based Oxidative Chemical Treatments for Polythionic Acid SCC Mitigation
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Nitrite-Based Oxidative Chemical Treatments for Polythionic Acid SCC Mitigation

Product Number: 51324-21145-SG
Author: Nathaniel Sutton; Sean Sears
Publication Date: 2024
$40.00
Reactive metal sulfides introduce safety and reliability risks to hydroprocessing (and other) refinery units during outages. Self-heating or pyrophoric catalysts are a concern, as is stress corrosion cracking of sensitized stainless-steel equipment open to air. A nitrite-based aqueous treatment has been developed and deployed in the field, which addresses both catalyst pyrophoricity and polythionic acid (PTA) SCC of equipment. This paper will present case studies where refineries have relied solely upon the nitrite-based oxidizing solution for PTASCC mitigation. Prior published laboratory testing of the nitrite-based oxidizing treatment used spray-applied iron sulfide (FeS) powder and moist air to produce a PTA environment. One limitation of that approach was that the porous nature of the surface does not adequately simulate a “real” FeS layer formed during years of exposure to high temperature sulfidizing processes. This paper presents additional test results on actively loaded bend specimens of ex-service 347H heater tube extracted from an operating diesel hydrotreater unit.
Recent Advances in Depth Assessment of Stress Corrosion Cracking Using Tangential Eddy Current Array on Carbon Steel Pipelines
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Recent Advances In Depth Assessment Of Stress Corrosion Cracking Using Tangential Eddy Current Array On Carbon Steel Pipelines

Product Number: 51322-17983-SG
Author: Michael Sirois, Mathieu Bouchard
Publication Date: 2022
$20.00

Stress corrosion cracking (SCC) is a failure mechanism that occurs in susceptible materials exposed to a corrosive environment and submitted to tensile stress above a certain threshold. In the presence of these combined factors, SCC can occur and potentially lead to the failure of an asset. This failure mechanism has been widely reported in several susceptible alloys of carbon steel, making SCC a considerable threat for pipelines in contact with corrosive soil. 
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