Tag Archives: Inconel

High Strength Fasteners for Hydrochloric Acid (HCl)

Posted on March 5, 2018 by dean

Q: I’m in need of a high strength fastener that can withstand moderate concentrations of hydrochloric acid (HCl) 25%? Can I use Hastelloy Bolts? I need a bolt that can handle a yield of about 100ksi and temperatures around 100F. A: Hastelloy bolts are definitely ideal in this concentration of … Continue reading →

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Hastelloy C276 Fasteners for Flue Gas Desulfurization Scrubbers

Posted on January 18, 2018 by dean

Q: I’m operating a FGD (Flue Gas Desulphurization) plant and am experiencing some mild corrosion on my scrubber bolting. I’m currently using Incoloy 825 bolts. It’s mild corrosion but non-the-less I’d like to have it cleared up before I get additional issues. Any suggestions? A: Since scrubber liquids and gases … Continue reading →

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Galvanic corrosion between Inconel fasteners and Monel in seawater

Posted on December 28, 2017 by dean

Q:  I am considering using Inconel 718 fasteners with a Monel K-500 flange in seawater. I’m concered as Inconel is the more anodic of the two and is also has a smaller surface area. Would this cause galvanic corrosion? A:  This is a great question. In this case if you plan … Continue reading →

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Inconel & Alloy 330 bolts for high temperature strength

Posted on November 20, 2017 by dean

Q: My customer is having an issue with his stainless steel fastener bending. They are being used in a high-heat application running at approximately 1600F. Is this normal? Any ideas? A: This is definitely expected at these temperatures. If temperature and strength are you main focus, I would suggest either … Continue reading →

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High temperature bolt for sulfur & chloride gas corrosion resistance

Posted on September 6, 2017 by dean

Q: I have a high temperature application which is exposed to sulfur and chloride gasses. We’re operating at between 1200° and 1400°F. Any suggestions on a bolt material to consider? A: To deal with both sulfuric/chloride atmospheres as well as high temperatures, you may want to consider Incoloy 800HT bolts … Continue reading →

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Corrosion resistance of Inconel 625 bolts vs Hastelloy C276

Posted on August 28, 2017 by dean

Q: Inconel 625 and Hastelloy C276 bolts seem to have similar Nickel content. Does this mean these fasteners will perform the same in a corrosive environment? A: Inconel 625 and Hastelloy C276 bolts do offer similar corrosion resistance but Hastelloy C276 has a slight edge in many acidic environements, especially … Continue reading →

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Alloy 20 fasteners for sulfuric acid corrosion

Posted on August 23, 2017 by dean

Q: I’m working with boiling sulfuric acid and tried Alloy 20 for some of my bolting but am having corrosion. I’m confused as I thought that is what they are best for. Any suggestions. A: You are right Alloy 20 does typically perform very well in sulfuric acid and even … Continue reading →

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Bolt for hot hydrogen sulfide, CO2, hydrocarbons & salt water

Posted on August 9, 2017 by dean

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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Hastelloy C22 bolts for hydrochloric acid steel pickling

Posted on June 21, 2017 by dean

Q: We are running a steel pickling process are considering switching from a sulfuric acid process to hydrochloric acid. Our system currently uses Inconel 625 bolting. With this be sufficient? A: Inconel 625 is a good material for acid corrosion but for large system of hydrochloric acid, especially with the … Continue reading →

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Zirconium fasteners exposed to downstream oxidizers

Posted on May 25, 2017 by dean

Q: I’m using zirconium fasteners in a sulfuric acid process but they are showing corrosion. I’m not sure why as I’m well below boiling and only using 40% concentration. There may be some downstream contaminants, but not much. Any ideas? A: It is most likely the contaminants that are causing … Continue reading →

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Duplex 2507: Bolts for geothermal drilling exposed to sulfur and salt

Posted on May 20, 2017 by dean

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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Best bolts for Inconel 625 flanges

Posted on May 18, 2017 by dean

q: What bolting material should be used with Inconel 625 flanges? We used ASTM A193 Gr B7 however noticing some corrosion issues. A: This is a very common problem but to answer it accurately, it depends on the environment that your flanges see and also to a certain extent what … Continue reading →

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Inconel bolts vs. Monel bolts. What’s the difference? Which is better?

Posted on May 11, 2017 by dean

inconel-monel-chart-copyThey rhyme, are both used in extreme environments, and are both nickel metal alloys, but Monel and Inconel are actually very different. But how? Let’s start with basic chemistry. Monel is a nickel-copper alloy and Inconel is a nickel-chromium alloy. So what does that mean for your extreme application? We … Continue reading →

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Inconel 625 vs. 718 bolts: Which Is Best for Your Application?

Posted on March 6, 2017 by dean

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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Galvanic corrosion using Inconel bolts

Posted on February 8, 2017 by dean

Q: Can dissimilar (also called galvanic) corrosion occurs between Inconel bolts and regular carbon steel? A:   Anytime you have dissimilar materials you have the potential for galvanic corrosion.  For this to happen the materials need to be wet or in some kind of solution. If they are dry it’s … Continue reading →

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Know Your Lock Nuts

Posted on February 2, 2017 by dean

lock-nut-chartA lock nut resists loosening from vibrations and torque. Specialty material lock nuts offer the ideal solution to many extreme applications environments. They combine the unique properties of specialty materials, with the secure locking feature of a lock nut to prevent failures in the field.

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Precipitation Hardened Bolts: The What & Why?

Posted on November 15, 2016 by dean

So you’ve heard the term, but what is it? Technically, it is a method in which an alloy’s structural matrix is altered on an atomic level by using temperature change to enhance the material’s mechanical properties – increasing the yield and tensile strength. Simply, it is a way to further strengthen a material. It is … Continue reading →

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