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Alloy 35Mo is a new versatile Ni-alloy which has corrosion and mechanical properties comparable to advanced Ni-base alloys, with the benefit that it can be processed like a stainless steel. The alloy was recently designated UNS N08935 with the composition 35Ni-30Fe-27Cr-6.5Mo-0.28N and has a PREN of 52. This paper presents the mechanical and physical properties of the material and results from corrosion testing. Corrosion results from general corrosion testing in acid environments, together with results from stress corrosion cracking testing in chloride environments and pitting corrosion testing show that UNS N08935 can be used in harsh environments in many applications, e.g. heat exchangers in refinery industry and equipment with seawater cooling. UNS N08935 also has high mechanical strength, and good weldability has been shown using Alloy 59 as filler metal.
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UNS S31600 is usually selected for pipes to be applied under conditions where cleanliness is an essential factor. As the lines around Sulfate Removal Unit (SRU) have this requirement (considering the membranes sensibility to any debris), it is common to find this alloy as the preferred one in the material selection criteria for systems like this in Floating Production Storage and Offloading units (FPSO) where the deaerator tower is upstream the SRU, with the role to limit the oxygen content up to 10 ppb in the seawater.
Although the selection of UNS S31600 agrees with ISO 21457 and NORSOK M-001 for this part of seawater treatment system (Figure 1), in 2019 several pits were noticed at pipes downstream the SRU in a FPSO being operated at Brazil Santos basin.
The chemical and radioactive waste at the Hanford Site is currently stored in 131 single-shell tanks and 27 double-shell tanks (DSTs). The DSTs were built between 1968 and 1986, and each has a capacity of about 1 million gallons. Figure 1 is one typical design of the DSTs. Double shell means that each tank consists of a primary tank within a secondary tank. The primary and secondary tanks are also known as liners, and both are made from carbon steel.
Additive manufacturing can manufacture components that were previously impossible - without compromising strength, ductility and corrosion resistance. The pitting corrosion resistance of a selective laser melted Nickel alloy has been evaluated by electrochemical methods.
High-level radioactive waste generated during reprocessing of spent nuclear fuel at Hanford has been stored in several single- and 27 double shell tanks (DSTs). Each DST consists of a primary shell (inner) surrounded by secondary (outer) liner. The secondary liner rests on a concrete foundation. Rainwater may seep in and accumulate in the drain slots and may corrode the exterior of the secondary liner. Evidence of wall thinning has been detected via ultrasonic inspections of the annulus floor between the primary and secondary tank shells. Since the inspection is confined to this region, there is a concern that corrosion is widespread on the underside of the bottom plate.
Study to assess pitting corrosion resistance of 316L ASS (UNS S31603) and 25%Cr SDSS (UNS S32750) in salt solutions containing dissolved oxygen(DO). The DO levels examined were: 20, 50, and 100ppb, and the concentration of chloride ions were up to 152g/L Cl-, at 50 and 60°C. The results are reported herein.
Large underground, carbon steel tanks are used for interim storage of liquid radioactive waste. The current corrosion control program needs to be updated to account for the susceptibility to pitting corrosion of waste tanks due to the halide content of the secondary waste.
One of the frequent and major problems encountered in the oil and gas production is theinternal corrosion of carbon steel pipelines. Corrosion can be categorized into uniform (orgeneral) corrosion, localized corrosion and erosion-corrosion. Uniform corrosion causesoverall metal loss and general thinning of metal. Localized corrosion has the appearanceof pits or grooves.
Nowadays, titanium-based alloys are commonly used in biomedical applications as, for example, materials for dental implants or hip replacements. Their good corrosion resistance, biocompatibility and high mechanical properties for a relative weight make them good candidates. However, improvements in the design of these alloys for biomedical applications need to be made.
Wells in oil, gas and geothermal production experience a broad spectrum of operating conditions in terms of temperature, depth, pressure and production environments, which govern material selection. For severe environments, where high strength and toughness combined with excellent corrosion and cracking resistance are required, a new superaustenitic stainless steel has been recently developed. Aiming for a minimum yield strength of at least 120 ksi (827 MPa), strain hardening enables the desired mechanical properties, allowing users to avoid well known but HISC susceptible and less cost effective precipitation hardened (PH) nickel alloys.