... were investigated. Pipe spools made from 22Cr duplex stainless steel, 25Cr duplex stainless steel and titanium Gr. 2 were welded using argon purging gas with mixed-in oxygen at various concentrations to simulate insufficient purging. The mechanical testing included tensile testing, impact testing...

... with the girth weld metal at mid-span of the specimen. Piping wall thickness ≥ 0.375-inch: Abstract The results of a stress corrosion cracking (SCC) qualification study of twenty-four heats of girth-welded 22Cr duplex stainless steel (DSS) piping are reported. This study evaluated the performance of either...

... samples with the size of approximately 20 mm x 20 mm were prepared from either 22% Cr duplex stainless steel base metal or weld metal pieces as shown in Figure 1 . The description of each sample and the typical microstructure of the surface subject to measurement of the samples are shown in Figure 2...

... specimens were wet ground with #600 SiC sandpaper, thoroughly degreased ultrasonically in acetone or ethanol. Abstract Duplex stainless steel (DSS) tubing is known to suffer the selective corrosion in acidizing operation. This study considers the effect of additives to corrosion inhibitor (CI) for DSS...

..., Sweden (5) Alfa Laval, Tumba, Sweden (6) Jernkontoret, Stockholm, Sweden ABSTRACT This work focuses on the influence of post-processing on microstructure and corrosion properties of additive manufactured (AM) super-duplex stainless steels (SDSS) 2507 consolidated via laser-powder bed fusion (L-PBF...

... Silicon 0.6 0.5 Chromium 8.9 15.8 Iron 82.4 71.6 Nickel 5.9 9.8 Molybdenum 2.1 2.3 Abstract Austenitic and duplex stainless steels are often used in corrosive environments due to their excellent corrosion resistance. These materials are chosen for their improved corrosion resistance...

... selection of flowlines. Flowlines Carbon Steel Non-metallic materials Duplex Stainless Steel INTRODUCTION Material costs for flowlines are a major component of CAPEX, therefore the design and material selection has to be optimal in order to ensure reliable and safe application over the design life...

... (17Cr-4.5Ni-3Mo-Cu-W: UNS No.S42825) by autoclave-based Four-Point Bent Beam (FPBB) testings. It was experimentally proved that martensitic stainless steel do not have a specific cracking-susceptible temperature range at around 80 °C to 100 °C (175 °F to 210 °F) where duplex stainless steel is said...

...Test Method Abstract Duplex Stainless steel 22Cr (DSS) is one of the corrosion resistant alloys (CRA) that is used extensively in oil and gas industry for critical applications such as wet gas production flow lines and pipelines. A number of new sour oil & gas projects in the company...

... ). The solidification sequence of the duplex stainless steels, according to Figure 1 , is: L → L + α → α → α + γ. The precipitation of χ and σ phase can occur for temperatures lower than 1000 °C, depending on the cooling rate ^{4 , 5} . Austenite precipitates from the ferrite phase...

... that could induce a negative verdict of ferric chloride pitting test. ASTM G48 ferric chlorides pitting test localized corrosion duplex stainless steel localized corrosion welding metallurgy qualification test intermetallics INTRODUCTION - THE INDUSTRIAL SCENARIO The application of Corrosion...

...Abstract Duplex stainless steels are characterized by a biphasic austenitic-ferritic microstructure, and have good corrosion resistance, toughness and high mechanical strength. Lean duplex grades have been developed to minimize cost fluctuations by reducing expensive elements like Ni and Mo...

...Abstract Duplex stainless steels (DSSs) are complex steels. These materials were originally manufactured to exploit the benefits of high strength and corrosion resistance arising from the duplex microstructure, i.e., ferrite and austenite. However, this very duplex nature can make these steels...

...⁾ E407 etchant No. 13) ¹⁵ with the second etching in a 20% NaOH solution at 4V for 5-8 sec (ASTM E407 ⁽³⁾ etchant No. 20) ¹⁵ . The microstructures were observed with a LOM. The chemical composition and microstructure of Duplex Stainless Steels (DSS) determine...

... steel super-austenitic stainless steel duplex stainless steel super-duplex stainless steel hyper-duplex stainless steel pitting corrosion sodium chloride magnesium chloride salt solutions electrolyte ASTM G150 UNS S31600 UNS N90804 UNS S31254 UNS S34565 UNS 32654 UNS 32304 UNS S32005...

... duplex stainless steel (DSS) is applied to welded components, ferrite measurement with manual point count according to ASTM⁽¹⁾ E562 is often used during welding procedure qualification as heat affected zone (HAZ) of the weld tends to have high ferrite content. For this measurement method...

...Urea Corrosion Stainless steel Duplex stainless steel INTRODUCTION Urea is produced by the reaction of ammonia and carbon dioxide at high pressure (140 bar) and temperature (183 °C). The first step in the synthesis is the formation of ammonium carbamate, which is the intermediate step...

... these materials are advantageous for managing internal corrosion, they still require external cathodic protection (CP) to prevent localized corrosion in seawater at typical operating temperatures. This CP results in hydrogen charging of the duplex stainless steel, either at uncoated locations or, in locations...

...INTRODUCTION Over the last decade, new Lean duplex stainless steels (DSS) grades have appeared on the oil and gas markets. The substitution of Ni by N and Mn in these new grades can represent an attractive technical-economic choice; however it influences their susceptibility to stress corrosion...

... as closely as possible. Once established the test procedure needs to be detailed to allow inter-laboratory testing replication. With this purpose in mind a testing program was designed using high strength martensitic and duplex stainless steels, namely, UNS S41426, 17CR (17Cr-4Ni-2.5Mo-1Cu) and UNS S39274...