Tag Archives: Crevice Corrosion

Q: Is AL6XN a steel or nickel alloy? Trying to figure out if it would perform as well as Monel in seawater. A: To answer your first question, AL6XN bolts are actually both a nickel and a steel alloy. AL6XN is often described as a high nickel content stainless alloy. Though … Continue reading

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Q: I need a material that will be suitable for oil and gas use. Submersion in hydrogen sulfide, carbon dioxide, hydrocarbons, salt water at temperatures up to 325F. Crevice corrosion has been a factor. Also need 170ksi min tensile strength. Plus we’d like to torque a 3/8-24 fastener to 50 … Continue reading

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Q: I’m running a steam surface condenser which is installed on a steam turbine in a thermal power station. I’m using sea water that could be contaminated with chemical pollutants cooling water side of the condenser. Any ideas on a good fastener for the tubes and water boxes? A: Duplex 2205 … Continue reading

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Q: I’m working on a on a geothermal energy drilling project. Carbon steel we’re currently using to bolt drilling components is failing from corrosion. We have corrosive an environment with high levels of sulfur and salt, as well as temperatures to 260C. Any suggestions? A: Super Duplex 2507 is often used … Continue reading

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Q: I have a waste water purifying situation where I’m using chlorine to treat the water. In addition to the acidic solution produced the fastener will also experience high loads, so I’m also concerned with stress corrosion cracking. Currently Super Duplex 2507 is not doing the job. Any recommendations on … Continue reading

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Q: We have a pulp & paper digester that is used to cook wood chips in an alkaline solution. The fasteners will be exposed to high temperatures and abrasive conditions. Any suggestions? A: Without knowing the specifics of your process, I can make two general material suggestions. Duplex 2205 fasteners are … Continue reading

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Inconel fasteners are commonly used for extreme environments and come in various “flavors” depending on the needs of the application. This brief paper will give you a quick comparison of the two most popular grades, Inconel 625 and Inconel 718 to help you choose the best material.

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