.... However, UNS 32100 or UNS S34700 are very sensitive to PTA-SCC because of the formation of a Cr depleted zone by the precipitation of Cr based M₂₃C₆ carbide along grain boundaries in coarsened Heat Affected Zones (HAZ) during welding processes. ² In order to prevent PTA...

... corrosion corrosion resistant alloys hydrochloric acid sulfuric acid sensitization INTRODUCTION The wrought, nickel-molybdenum (Ni-Mo) and nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are very important materials of construction in the chemical process, pharmaceutical, petrochemical, and oil and gas...

... Nonetheless, since UNS N07725 and UNS N06625 ( Table 1 ) have a comparable Cr and Mo content, their corrosion resistances are considered similar. ³ Additionally, Nb and Ti stabilize the alloy, reducing the sensitization produced by the intergranular precipitation of Cr-carbides. ^{3 , 13}...

... 0.154 0.41 Aging condition To simulate the sensitization treatment, similar welded joints were subjected to aging heat treatments at 550 °C up to 1,000 hours. This aging temperature was chosen because it corresponds approximately to the nose temperature of the Time-Temperature-Sensitization (TTS...

...-depletion along the GB (i.e., sensitization), the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test was identified as a promising technique to detect GB decoration. The objective of this work was to optimize the DL-EPR technique for UNS N07725 by testing three types of samples...

.... Abstract Austenitic stainless steels for non-magnetic drill collars (NMDC) may be susceptible to precipitation of Cr-rich phases at grain-boundaries during the necessary thermo-mechanical processing. This condition, known as sensitization, is detrimental to resistance to localized corrosion, stress...

... with simulated welding Heat Affected Zone. Polythionic acid stress corrosion cracking (PTA SCC) Sensitization Proprietary version S34751 Hydroprocessing Carbon content INTRODUCTION Stabilized austenitic stainless steels such as UNS S32100 or UNS S34700 are widely used in hydro-treating or hydro-cracking...

... heavily sensitized with embrittling phases present at the austenite grain boundaries. Improper annealing processes at the manufacturing plant likely caused the sensitization of the microstructure. Downstream of the reformers, UNS S30403 austenitic SS tube ends of the boiler feed water heat exchanger...

... to sulfidation, possibly due to formation of nickel sulfide eutectic phases that have low melting points. The sensitization of alloy 800HT during operation and maintenance activities also increased the susceptibility towards sulfidation. Other possible damage mechanisms, such as creep, naphthenic acid corrosion...

...) phase is avoided since it is typically associated with sensitization. Recent work by the present authors to create an atlas of microstructures for this alloy included experimental validation of calculated Time-Temperature-Transformation (TTT) curves as a function of variation in alloying elements within...

... complemented with results from welded and from cladded samples. UNS N08034 2.4692 UNS N08031 NiCrMoFe alloy 6-Mo steel mechanical properties corrosion resistance fabricability sensitization weldments cladding MOTIVATION FOR THE DEVELOPMENT OF UNS N08034 The new alloy UNS N08034 is a further...

...The corrosion rate and maximum internal attack data ( Table 1 ) suggest that N10276 alloy is highly susceptible to sensitization in the temperature range of 1200-1900°F even when exposed for a shorter period of time. Table 1 Corrosion rate (in mils per year) and maximum internal attack (in mils...

...It is notable that these tests are intended to be comparative tests, whereby the corrosion rate of annealed ‘control’ material should be compared to that of the sensitized material. There are several test methods available for intergranular corrosion testing, and the test method should be chosen...

... sensitization standard corrosion tests stress corrosion cracking INTRODUCTION The nickel-based alloys UNS N06625 and N08825 are today commonly used in the Oil & Gas industry for piping or pressure vessels applications. The material selection is mainly driven by the corrosivity of the environment in terms...

... the scribed grid following tape removal. This result was identical for all formulations following 24 hour wet immersion, as well as dry adhesion testing. Abstract Sensitization of 5xxx series aluminum alloys is a significant concern for the U.S. Navy as the alloys have found use in a variety of ship...

...Abstract UNS N06690 is one of the current choices for nuclear power plant steam generator tubing. The alloy intensity to some submodes of stress corrosion cracking is a function of sensitization. Sensitization results from chromium carbide precipitation at grain boundaries when the alloy...

...Abstract Double Loop-Electrochemical Potentiokinetic Reactivation (DL-EPR) is a valuable technique to test Type 304 stainless steel (SS) materials and components for the presence of grain boundary chromium depletion and assess material sensitization. This has practical relevance for the evaluation...

... compensated by the necessity of optimization for each single material. intergranular corrosion ASTM G108 ASTM G28A depletion zone sensitization INTRODUCTION From Fig. 4 is visible, that corrosion test results of both test fits well together for UNS S31603. Corrosion rate is at 1mm per year...

... measurements and are critically discussed. In conclusion, the most promising production parameters of thermo mechanically rolled UNS 06625 are described. UNS 06625 intergranular corrosion ASTM G108 ASTM depletion zone sensitization INTRODUCTION Intergranular corrosion behavior of many passive alloys has...

...-term (~ 12 months), constant temperature (40 to 70°C) exposure tests. Other samples were treated in thermal exposure furnaces with cyclic temperatures (40 to 45°C and 50 to 70°C) to represent the heating cycles in service conditions. STEM EDS sensitization β-phase ASTM G67 INTRODUCTION The effects...