What is the best materials for 2500 F operation?
What is the best materials for 2500 F operation?
(OP)
We need to have a horizontal pipe in a 2500°F environment. What is the best material to use so that is does not droop from it’s own weight?
Thanks in advance, Ed Danzer
Thanks in advance, Ed Danzer





RE: What is the best materials for 2500 F operation?
TTFN
RE: What is the best materials for 2500 F operation?
http://www.techceramics.com/products.html
Is your atmosphere in and around the tube going to oxidizing or reducing?
RE: What is the best materials for 2500 F operation?
RE: What is the best materials for 2500 F operation?
2500 F is the same temperature as the inlet to an advanced, modern gas turbine . All the best brains in that business have been working on finding such an alloy for at least 2 decades, and the best they could come up with are (a) single crystal ceramics and (b) air cooled or steam cooled blades.
RE: What is the best materials for 2500 F operation?
what is the tube diameter and separation between supports. the fluid and its state on either side of the wall is also useful
RE: What is the best materials for 2500 F operation?
The pipes extend a short distance into a cement kiln. For this experiment the customer has chosen to use Inconel 601, it only has to run 3 days, but be ready to install March 12. I suggested air or water cooling, but the proto type testing time frame has ruled this out. After this first test we will be looking at ceramic, refractory metal as well as cooling if further work is to be done.
Thanks again,
Ed Danzer
RE: What is the best materials for 2500 F operation?
Be aware that nickel alloys will self-destruct extremely rapidly in the presence of sulfur at the temperatures you are talking about. The nickel reacts with the sulfur to form an intermetallic phase that is liquid at this temperature and the alloy will go away as fast as this reaction can take place.
RE: What is the best materials for 2500 F operation?
Are oyu using the tube for gas sampling or in a closed end arrangement for temperature measurement?
RE: What is the best materials for 2500 F operation?
RE: What is the best materials for 2500 F operation?
RE: What is the best materials for 2500 F operation?
Could the Inconel be chrome plated, or have a spray coating applied to increase life? This is something that may fit into the construction time constraint. We should receive the material by Tuesday, and only have to thread one end of each pipe.
RE: What is the best materials for 2500 F operation?
To the best of my memory, most of those materials were Inconel, or similar.
Why not go with that type of concept?
rmw
RE: What is the best materials for 2500 F operation?
Most kilns run on induced draft, so the pressure is slightly negative. You'll get some sifting through the protection tube, but as long as you have proper purges protecting your transducers it is not a big problem.
Inconel is unsuited to the service. Typically it will burn-off to within a inch or two of the refractory face, depending on the gas temperatures and the amount of sulfur in the system. That may be adequate for a trial run, but not for the long term. There are cheaper materials if a sacrifical tube was being considered.
We used infrared systems with closed end tubes, but the ultrasonic measurement is the new kid on the block these days.
RE: What is the best materials for 2500 F operation?
We are penetrating the side of the kiln.
The first test went ok, now they want to change lengths, and increase life. Has anyone tried Chrome plating the Inconel for corrosion resistance and wear?
There is reluctance to try ceramics because of the shock wave from the 190db signal generator.
RE: What is the best materials for 2500 F operation?
Forget Cr plating. There are a few alloys that can take you to 2200F, but their life time is limited and the strength is way down. With time most metals will burn off to within an inch of the hot face of the refractory lining anyway. So use a cheap solution.
Are there ceramics better suited to your application? Yes and they're really tough and the cost is not too bad, but their use presents a host of design problems that have to be worked through.
Kiln temperature has been the holy grail of control, but equally elusive to implement. There are other, more complex, and inferential control schemes being used.
Good luck,