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Stress Corrosion Cracking in the weld and heat affected zones of Duplex Stainless Steels has been experienced in different industries. In this paper, an attempt has been made to study the various aspects of this type of corrosion, brought about by welding. Results show duplex stainless steel base metal is also susceptible.
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Various alloys subjected various heat treatments were examined in-service and tested to determine their susceptibility to stress relaxation cracking.
The research was focused to assess the key factors concerning relaxation cracking and how to control it. It included the effect of chemical composition of the base materials (both Fe and Ni base alloys), heat to heat variation, grain size, cold deformation, welding, operating temperature and heat treatments.
An advanced grade of super-austenitic stainless steel with a reduced content of nickel offers a significant economic advantage over nickel-base CRA’s. As the alloy is readily fabricated by conventional techniques, it is an excellent candidate for a variety of applications in the chemical, petrochemical, mining, oil and gas, and refining industries.
Based on alloy development and manufacturer independent supply experience of super duplex steel over a 30 year period the paper considers some of the less well known but recurring problems and the methods used to ameliorate them.
In this study, welding trials were performed on 22% Cr duplex stainless steel UNS S32205 corner joints with different wall thickness similar to the top plate and tubesheet plate joint configuration used in a fin fan cooler header box.
Builds upon a previous study that compared the corrosion resistance of multiple corrosion resistant alloys in several simulated (marine exhaust) scrubber environments.
Ferrite measurements are used during welding procedures on duplex stainless steel. We studied the effects on the measured ferrite contents of (1) grid size, (2) number of fields and (3) measurement locations.
Very different corrosion behavior was observed between adjacent welds. This paper describes the investigation to identify the corrosion mechanism, trying to understand the influence of filler metal composition and welding parameters.
The focus of this paper is the welding metallurgy and weld metal properties of N07022 alloy. Evaluation of the N07022 weld metal microstructure will be discussed. Sour gas testing of N07022 weld overlay material will be highlighted. Mechanical properties will be presented.
Alloy 699 XA is a new alloy, which was developed for application in petrochemical industry under metal dusting conditions at high pressure. It contains 30% chromium and 2% aluminum.
Primary water stress corrosion cracking (PWSCC) testing of Alloy 182 and 152 welds was conducted using 1/2 compact tension specimens at 325 ℃ in simulated primary water environments of a pressurized water reactor.