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In context of acceptability of 17-4 PH in sour service, an literature survey of complex metallurgy of this grade was done following a mechanical rupture in service. In addition, three 17-4 PH materials were studied in terms of microstructure, mechanical properties and susceptibility to sulfide stress cracking.
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A new, lean duplex stainless steel with low nickel content was tested, in both as-welded and mill-annealed conditions, to determine its resistance to corrosion in many environments.
The increased use of high-performance fiber-reinforced polymer (FRP) composites in aerospace, marine, alternative energy, civil, and architectural projects has presented challenges. Defects in composite parts require thorough investigation to ensure compliance with safety requirements and overall structural integrity.
This paper focuses on the advancements of FRP composites and their specific applications in structural engineering, with a particular emphasis on Premier Composite Technologies.
UNS S209101, also known as XM-19 by ASTM A2762, is a nitrogen-strengthened austenitic stainless steel with high strength and excellent corrosion resistance. Besides nitrogen (N) it also contains higher amounts of chromium (Cr), nickel (Ni), manganese (Mn), and a similar molybdenum (Mo) content compared with UNS S31603, as well as small additions of niobium (Nb) and vanadium (V). High contents of Cr, Mo and N confer this stainless steel high localized corrosion resistance. Mo, Mn and Cr increase the nitrogen solubility in iron alloys.
The mechanical properties of polymeric coatings are often overlooked because researchers are not aware of how modern instrumentation can now aid them in understanding how a particular product may survive in service conditions. In many applications the two main considerations are aesthetics and durability, both of which can be directly related to the mechanical properties of the base material.
Additively Manufactured Alloy UNS N07718 (AM 718) has been increasingly adopted for components in oilfield applications. AM 718 fabricated using laser powder bed fusion (LPBF) has demonstrated not only excellent mechanical performance, but also promising capabilities in critical services such as sour or hydrogen-generating conditions. In oilfield applications, it is generally felt that AM 718 should comply with API standard 20S4, and align with the requirements for wrought 718 in API 6ACRA.
The tensile pull-off test, as in ASTM 4541, in which a round metal ‘dolly’ is glued to a coating then pulled off is a very common method for measuring adhesion of a coating to its substrate. This technique is very well known to produce joint failures that are not at the intended coating steel interface but may initiate within the coating, within the glue or at the glue-coating interface.
Two component Epoxy polymer systems have been used as the basis for high performance protective coating systems since the 1950s. Numerous Epoxy resin types and ambient condition curing agents are available today which allow great flexibility in the formulation of coating products. This has led to the development of a wide range of applications ranging from simple anticorrosive systems to high performance heat and chemical resistant coatings and linings.