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51318-10612-In-service Embrittlement of 25%Cr Super Duplex Stainless Steel

Picture for In-service Embrittlement of 25%Cr Super Duplex Stainless Steel
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Metallurgical investigations on a welded sample of 25% Cr super duplex stainless steel (UNS S32750) from a vessel that had operated above 300-350°C (570-660°F) for six months, resulting in brittle fracture.

Product Number: 51318-10612-SG
Author: Mikihiro Sakata / Ichiro Seshimo / Tomoaki Kiso / Toshiaki Okabe
Publication Date: 2018
Industry: Science of Corrosion
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Metallurgical investigations were carried out on a welded sample of 25% Cr super duplex stainless steel (UNS S32750) taken from a vessel that had been accidentally operated above 300-350°C (570-660°F) for at least six months, which had resulted in brittle fracture. As a result of microstructure observations, no abnormalities were found in the ferrite/austenite balance and no intermetallic phases were observed in the sample, while Charpy impact tests at room temperature revealed quite a low absorbed energy in both, the base metal and the weld metal. These results indicated the occurrence of 475°C (885°F) embrittlement in the steel. De-embrittlement heat treatment trials were also performed to find out the effective temperature range. The aim of this paper is to draw attention to the risk of in-service embrittlement of duplex stainless steels, highlighting the difference in susceptibility to 475°C (885°F) embrittlement of the base metal and the weld metal.

Key words: 25% Cr super duplex stainless steels, 475°C (885°F) embrittlement, de-embrittlement heat treatment

Metallurgical investigations were carried out on a welded sample of 25% Cr super duplex stainless steel (UNS S32750) taken from a vessel that had been accidentally operated above 300-350°C (570-660°F) for at least six months, which had resulted in brittle fracture. As a result of microstructure observations, no abnormalities were found in the ferrite/austenite balance and no intermetallic phases were observed in the sample, while Charpy impact tests at room temperature revealed quite a low absorbed energy in both, the base metal and the weld metal. These results indicated the occurrence of 475°C (885°F) embrittlement in the steel. De-embrittlement heat treatment trials were also performed to find out the effective temperature range. The aim of this paper is to draw attention to the risk of in-service embrittlement of duplex stainless steels, highlighting the difference in susceptibility to 475°C (885°F) embrittlement of the base metal and the weld metal.

Key words: 25% Cr super duplex stainless steels, 475°C (885°F) embrittlement, de-embrittlement heat treatment

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51318-10634-Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds

Product Number: 51318-10634-SG
Author: Nozomi Satake / Mikihiro Sakata / Tomoaki Kiso / Toshiaki Okabe /
Publication Date: 2018
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Ferrite measurements are used during welding procedures on duplex stainless steel. We studied the effects on the measured ferrite contents of (1) grid size, (2) number of fields and (3) measurement locations.

 
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51318-10568-Quality & Performance Review of Duplex Stainless Steel Products – An End Users Perspective

Product Number: 51318-10568-SG
Author: Janardhan Rao Saithala / Gurram Bhaskar Rao / Manoj Suryanarayana / Talal Nebhani / Pedro Rincon / Nasser Behlani / Mohammed Ghafri / Amjad Kharusi
Publication Date: 2018
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Quality assurance and procurement & construction challenges associated with DSS materials and operational best practices to ensure integrity and meet intended design life cycle of DSS components.

 
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51318-10512-Effects of nitride precipitation in duplex stainless steel

Product Number: 51318-10512-SG
Author: Marco De Marco / Marco Palombo / Anthony Pianezze / Abderrahmane Taiche / Valentina Spinelli / Marina Delucchi
Publication Date: 2018
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The aim of this paper is to find a correlation between nitride content/distribution and properties of two of the largely adopted Duplex Stainless Steel (DSS), UNS* S32205 and UNS S32750. *Unified Numbering System
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