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.
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.
Aims to evaluate stress and strain around a pit and to determine the relationship between plastic zone size and pit geometry using the Finite Element Method (FEM). A database containing the relationship of pit parameters and plastic zone size can provide an understanding of the risk of through-wall failure in X65 steel.
Seawater desalination with waste heat from nuclear or fossil power plants is an attractive alternative for the production of potable water.1 Multi-effect desalination process (MED) relies on the evaporation of water from a thin film of seawater.2 The heat of condensation is used in the evaporation of water from a subsequent film of seawater.
A new super austenitic stainless steel has been developed for use in highly corrosive wet environments.
The new alloy, Alloy 35Mo, has the general chemical composition 27Cr-35Ni-6.5Mo-0.28N and PRE>52,
suggesting high resistance towards chloride induced localized corrosion. The Alloy 35Mo has excellent
corrosion resistance in chloride bearing environments, and has also shown surprising mechanical
properties with a combination of high yield strength, excellent ductility and low hardness. The main
applications for the new grade will initially be heat exchanger tubing, small dimension piping and hydraulic
& instrumentation tubing. Target industries are refineries, chemical and petrochemical plants and offshore
installations. This paper discusses Alloy35Mo, its properties, and a comparison with existing,
This work details the failure analysis of a super duplex valve (UNS J93404)(1) ASME(2) class 1500, operating in treated sea waters with high chloride content below 80°C. A detailed analysis of the microstructure, fracture surfaces and mechanical properties was combined with studies of corrosion resistance of different regions by means of immersion tests (ASTM G48)(3)33, electrochemical analysis and polarization tests (large scale and with a micro-cell). Selection of base material was performed according to Table A.24 of NACE MR0175/ISO 15156-3(4).
The cast material presents a segregated microstructure containing ferritic phases with different pitting resistance equivalent number (PREN); this strongly affects the corrosion properties of the material, enhancing the susceptibility to localized corrosion and leading to a Stress Corrosion Cracking (SCC) mechanism.