Tom,
I would never profess to know more than 10% of what you yourself knows about the subject. With that in mind, it sounds like there would be extremely high pressures involved and studs would need to be made of VERY high tensile strength steels, with rolled threads for ultimate thread integrity.
I once made a 12-piece set of studs, threaded on both ends. They were cut threads though, not rolled. The application in this case was downstream filtration equipment for a high-pressure plastics extruder. I had to have a minimum of seven leads of thread pullout taper., and I did all 24 threads on a manual machine by hand. I am sorry but I don't recall the exact alloy, but it may have been 420 stainless steel, pre heat treated.
Perhaps a read through of this Wikipedia entry can shed some light on maraging steels. I'm no metallurgist, but I would think that your application shares some characteristics of those mentioned in the article. Among those characteristics is the important one of retaining high tensile strength even under elevated temperatures, with minimal dimensional growth.
http://en.wikipedia.org/wiki/Maraging_steel
Here's a candidate steel for you. Compare the 270KSI strength to even an AISI 4340 steel, and the Vascomax appears to be a winner.
http://www.magellanmetals.com/maragingc300.html
That's the best I can offer you for now, and do remember my disclaimer.
Ken
I would never profess to know more than 10% of what you yourself knows about the subject. With that in mind, it sounds like there would be extremely high pressures involved and studs would need to be made of VERY high tensile strength steels, with rolled threads for ultimate thread integrity.
I once made a 12-piece set of studs, threaded on both ends. They were cut threads though, not rolled. The application in this case was downstream filtration equipment for a high-pressure plastics extruder. I had to have a minimum of seven leads of thread pullout taper., and I did all 24 threads on a manual machine by hand. I am sorry but I don't recall the exact alloy, but it may have been 420 stainless steel, pre heat treated.
Perhaps a read through of this Wikipedia entry can shed some light on maraging steels. I'm no metallurgist, but I would think that your application shares some characteristics of those mentioned in the article. Among those characteristics is the important one of retaining high tensile strength even under elevated temperatures, with minimal dimensional growth.
http://en.wikipedia.org/wiki/Maraging_steel
Here's a candidate steel for you. Compare the 270KSI strength to even an AISI 4340 steel, and the Vascomax appears to be a winner.
http://www.magellanmetals.com/maragingc300.html
That's the best I can offer you for now, and do remember my disclaimer.
Ken