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Sulfuric acid is one of the most important elementary substances of the chemical industry. There is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range. This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.
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This paper describes three corrosion case histories caused by overconfidence and lack of thorough understanding of the corroding systems. 1. Exchanger tube failure. 2. Hydrogen induced cracking. 3. Inappropriate mixing of process streams.
Sulfuric and hydrochloric acids are among the most common chemicals produced.in the process industry. Nickel alloys have been a traditional material of choice. This paper will review the alloys available for this service as well as identify the temperature limits and other conditions that should be considered when selecting an alloy.
This study will provide an overview of silicon-based chemical vapor deposition (CVD) nanocoatings that, when applied to stainless steel and other alloys, fight corrosion while simultaneously easing design, fabrication, and integration of coated components.
Corrosion rates of low porosity AM S31603 and AM N06210 in several kinds of acidic solutions were similar to those of wrought alloys respectively, the corrosion rates of AM S31603 and AM N06210 became higher with increasing porosity of each specimen.
Mill-annealed coupons of UNS N10276, N06022 and N06035 alloys were heat-treated at different times and temperatures, then tested in ASTM G-28A solution followed by internal attack measurement through optical microscope.
The high performance alloy UNS N06058 contains about 21 wt.-% chromium and at least 18.5 wt.-% molybdenum. It is the first member of the Ni-Cr-Mo alloys intentionally strengthened with nitrogen. Based in the combination of its alloying constitutes this alloy is highly resistant to oxidizing as well as to reducing corrosive media. Evidenced by the high Pitting Resistance Equivalent (PRE) number of about 86 the alloy UNS N06058 shows an outstanding resistance to localized corrosion as well.
The objective of this paper is to outline the characteristics of alloy UNS N06058 and therefore to highlight the successful use of it in demanding corrosive applications in the process industry and other sectors.
Main characteristics such as microstructure, mechanical properties and fabrication will be discussed. The very good weldability of alloy UNS N06058 has been verified by the German TÜV1. A matching filler metal, which is officially qualified according to AWS 5.14 (American Welding Society)2, is available. In addition, prior work shows that alloy UNS N06058 can be reliably explosion clad. Furthermore, corrosion resistance determined under laboratory conditions as well as in field studies will be presented not only for the base material but also exemplary on welded and cladded samples. Examples of applications will complete the comprehensive overview of this work.
The crude oil produced by fracking or hydraulic fracturing method are high in sulfur content (0.5%)1. The vast majority of vessels that are used in the petrochemical industry to store and transport materials are constructed using Carbon steel. Coating linings used for corrosion protection inside of vessels and tanks must perform under severe conditions such as an exposure to corrosive gasses ( H2S) and carbon dioxide as well as high temperatures, high pressures and often must withstand the cold wall effect and rapid decompression.
Ni-based corrosion resistant alloys UNS N06035 and UNS N10362 were designed with the goal of withstanding some of the most aggressive environments found in various sectors of the chemical processing industry (CPI). These alloys have successfully found a niche in process-specific environments that are uncommonly aggressive, pushing the envelope for higher chemical processing efficiency, performance and durability.
N06035 alloy was designed to resist “wet process” phosphoric acid, which is used in the production of fertilizers.