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Picture for High-Pressure SSC Testing of TMCP Large-Diameter Pipeline Steel
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High-Pressure SSC Testing of TMCP Large-Diameter Pipeline Steel

Product Number: 51324-20855-SG
Author: Thomas Haase; René Rüter ; Christoph Bosch
Publication Date: 2024
$40.00
In the recent years concerns have been raised on the validity of 1 bar H2S testing to be representative of the full extension of SSC region 3 as currently defined in NACE MR0175 / ISO 15156-2. Within this work SSC four-point bend tests have been performed on base material and weld specimens from TMCP-based large-diameter pipes at exposure conditions in the range of 1-12 bar H2S partial pressure in the presence of different levels of CO2 up to 24 bar. The results are discussed based on microstructure and hardness of the tested pipes. Metallographic evaluation of the specimens to distinguish between SSC, grooves or stress-induced pits has been performed based on a recently published micrographic evaluation criteria chart. For this evaluation method, several examples are presented and discussed to contribute to the collection of data as a basis for damage feature evaluation. The results show that the tested TMCP-based large-diameter pipes are resistant to SSC at partial pressures of H2S above 1 bar, based on material parameters and test conditions. It is recommended to further investigate how the limits of SSC resistance depend on the quantity of CO2 present.
Picture for Investigating Crack Initiation and Propagation from Hard Spots In TMCP Steels Exposed to Wet Sour Environments
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Investigating Crack Initiation and Propagation from Hard Spots In TMCP Steels Exposed to Wet Sour Environments

Product Number: MECC23-20109-SG
Author: Maslat Al-Waranbi; Saad M. Al-Muaili; Khalid BaBakri
Publication Date: 2023
$20.00

Hard spot cracking is a type of sulfide stress cracking (SSC), which is a common type of Hydrogen
Embrittlement (HE). The embrittlement by SSC is attributed to the hydrogen atoms (H+), as corrosion byproduct, that permeate/diffuse through the metal with the presence of H2S. Then, when hydrogen atoms get entrapped at specific microstructural configurations, material ductility will be impaired and material will be embrittled [2].
Picture for Is 22 HRC the right threshold for TMCP large diameter pipes in severe sour environment?
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Is 22 HRC the right threshold for TMCP large diameter pipes in severe sour environment?

Product Number: 51323-18943-SG
Author: Hervé Marchebois, Christophe Mendibide, Bruce Cowe, Carole Dessolin
Publication Date: 2023
$20.00

The manufacturing and field experience of high strength low alloy (HSLA) steel plates produced by Thermo-Mechanical Controlled Process (TMCP) are well defined in industry standards and literature. The TMCP method consists of a well-prescribed rolling pass schedule followed by accelerated cooling that leads to a fine-grain microstructure with the desired mechanical properties of the produced plates.
Quite recently, this TMCP process resulted in detrimental local variations with hidden hardness variations on pipe ID, so-called Local hard Zones (LHZ).
Picture for SSC Limits Of TMCP Line Pipes
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SSC Limits Of TMCP Line Pipes

Product Number: 51321-16516-SG
Author: Hervé Marchebois/ Christoph Bosch/Ali Smith
Publication Date: 2021
$20.00
Picture for Surface Hard Zone Phenomenon In TMCP Line Pipe For Sour Service: A State Of The Art Review
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Surface Hard Zone Phenomenon In TMCP Line Pipe For Sour Service: A State Of The Art Review

Product Number: 51321-16563-SG
Author: Ali Smith/ Carlo Spinelli
Publication Date: 2021
$20.00
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