Extreme high strength fasteners made from advanced alloys allow industries such as aerospace, mining, and oil & gas to push the limits of what is possible. With requirements of ultimate tensile strengths beyond 200ksi this newsletter reviews these materials, their specific traits and niches.
17-4 PH
NICHE: Customized strength via several different age hardened conditions.
WASPALOY
NICHE: Strength at extreme temperatures well over 1300F exceeding that of Inconel 718.
INCONEL 718
NICHE: Unique combination of strength, temperature and corrosion resistance.
MP159
NICHE: Superior strength with good temperature resistance.
MP35N
NICHE: Strongest fastener material commercially available.
When Strength AND High Temperature are Needed
Often high strength materials are needed in extreme temperature situations. This chart ranks the high temperature capabilities of these alloys.
I’m currently looking to purchase MP35N & Inconel 718 material.
I would like to know if these two materials would cause any type of galling issue to my current parts made out of Nitronic 50 material.
Hello Mario,
One of the best ways to minimize galling is to use dissimilar matting materials especially with regards to composition and hardness. In this case the Nitronic 50 is a iron based alloy, while Inconel 718 is nickel based and MP35N is nickel / cobalt based alloy. Because of these large differences in chemistry as well as Inconel 718 and MP35N being much harder than Nitronic 50, I would think galling will be not much of an issue. If you still have concerns, you could try using a moly-disulfide anti-seize lubricant to further minimize the effects. (https://www.specialfastenersbolt.com/extreme-anti-seize-lubricant.html)
Dean