Tag Archives: Inconel 718

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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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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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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Usable temperature limit of Inconel 718 bolts

Posted on April 7, 2017 by dean

Q: What is the highest temperature I could use Inconel 718 bolts? A: Inconel 718 fasteners could be used reliably up to about 1300F.  Because Inconel 718 is  heat treated or age hardened at 1325F, going beyond 1300F will significantly affect its strength properties. Furthermore, its strength may not fully return. … 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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