Steampipe manifold failure
#103
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FM sold (sells?) a brace for their downpipes years ago. I ran one for a short time with no issues. Some people found that the exhaust clamp would crush the downpipe some after time though. Others theorized that a brace could act as a pivot point for the system and and exaggerate the exhaust torque on the downpipe. I think it was Bob Bundy would posted a picture of his custom "wider" U bracket similar to what FM sold that he had used for awhile without issue.
#106
SADFab Destructive Testing Engineer
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Inconel or gtfo.
One of the things I learned about 321 is that it contains titanium. The titanium helps stabilize the metal when being welded, and makes it a lot less brittle after welding.
I went with 321 sched 40, because 347 was cost prohibitive. 316 flanges.
One of the things I learned about 321 is that it contains titanium. The titanium helps stabilize the metal when being welded, and makes it a lot less brittle after welding.
I went with 321 sched 40, because 347 was cost prohibitive. 316 flanges.
#107
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Everyones experience and help is greatly appreciated.
I think a bracket with this basic design bolted to the downpipe flange will work well, I intend to use the same sized material as the MSM which I believe is 4mm. Ive contacted my laser cutting place and design guy and they can both do it easily the only question is tracking down a business who can bend the steel with a small radius to help eliminate the chance of cracking the highest stressed parts on the bends.
Does anyone here know enough about material selection for a job like this? Perhaps point me to a "metal selection for dummies" resource?
Dann
I think a bracket with this basic design bolted to the downpipe flange will work well, I intend to use the same sized material as the MSM which I believe is 4mm. Ive contacted my laser cutting place and design guy and they can both do it easily the only question is tracking down a business who can bend the steel with a small radius to help eliminate the chance of cracking the highest stressed parts on the bends.
Does anyone here know enough about material selection for a job like this? Perhaps point me to a "metal selection for dummies" resource?
Dann
#108
410 or 420 (I forget which one is better for bending) would be my choice. To do the bending you can just make your own form. Make a 90deg block (might have to be closer to like 88° depending on spring back) and weld a round of the same inside bend radius you want to the end of an arbor for your hydraulic press and I think you can figure out the rest.
#110
Really though, it's the higher creep rupture characteristics of 321/347 at temperature that give them an edge in a manifold application.
I would like to see 309 or 310 used as they take it to the next level with more nickel. Of course then there's inconel and other nickel based superalloys...
#113
Wow, I never knew that. Huh. Had to wikipedia that shiz. Interesting: "... the IUPAC accepted tungsten instead of wolfram in deference to North American usage; and niobium instead of columbium in deference to European usage."
I kinda wish we had stuck with columbium so that we can have wolfram instead. Wolfram!
I kinda wish we had stuck with columbium so that we can have wolfram instead. Wolfram!