B16 alternative

[kevlar49]

Hi,

Can someone help me with a question regarding B16 studs? I have a B16 stud on a floating head that is experiencing H2/H2S (Cooper-Gourman) corrosion. I am trying to avoid specifying B8 class 2 (strain hardened stainless steel) because of a chloride SCC concern. I remember that there is a stud made of a nickel base alloy but I cannot remember the ASTM number. Can someone help me?

 

[TVP]

ASTM F 2281 is the standard for SS & Ni alloys fasteners for high temps.

 

[TVP]

I re-read your original post and wanted to add some additional comments. Alloys 600, 601, and 718 are the only Ni-based alloys referenced in ASTM F 2281. Alloys 600 & 601 are used in the annealed condition, while 718 is used in the age hardened condition. Special Metals has developed other alloys that you may have been thinking of such as Alloys 686, 625, or 725. Inconel 686 is used in the annealed or cold worked condition, while the other two are age hardened. The Special Metals website has product brochures on all of its grades, and a number of technical papers that may be of assistance:

http://www.specialmetals.com/technical.php

 

[kevlar49]

Thanks TVP! Someone mentioned ASTM A453 Gr. 660 as well. I'm going to look into both.

 

[CoryPad]

Grade 660 is not a nickel alloy, but rather, is an iron alloy with high Ni (~ 25 %) and high Cr (~ 15 %) concentrations.