Inconel cylinder

Try to contact Special Metals, maybe they will be able to help you.

I don't know what country you come from but they have plants all over the world.

Rosy

Hi Rosy,

Thanks for your reply. Please let me know what are the factors to be considered in the rooling process to achieve this close toleracne.

thanks

-Nava

Hi,

how many?,

how is the welding done?,

any stress relieve after welding?,

thickness variation of metal sheet?

How to suport on measurement that little distortion by weight?

I would like to reject the project if in your position.

Then argue hard to get minimum 4 mm thickness.

Ask the experienced users of sophisticated rolling equipment (flat or tube) what they are able to do (with respect of thickness/length and tolerance). Flat: SANDVIK, Sweden, tube : may be nobody.

If your customer is willing to pay a heavy extra bunch of $$ then think about an expandable ceramic mechanism to stretch the nearly ready cylinder while annealing.

Have success and please report here.

RHABE

Inexpensive and accurate method would be to opt for progressive press brake forming using ID or OD contour check template. Polyurethane assisted die will give remarkably accurate results. You need to fabricate two half shells with extra material at edges for controlled post forming trimming and will need two weld joints. Spring back calculations and set up to attain the exact cylinder and for a perfect edge weld joint will be a challenge during roll forming of Inconnel sheet. The above suggestion is for limited quantity production.

We use Inconel in several critical applications in the nuclear industry. Most of it is in piping. This piping is usually fabricated thru mandrel drawn dies (i.e. seamless). Since your tolerance is about .040 over 3' (1m), I would say you would be fine using a rolling process. Inconel is a little more stiffer than stainless steel to form so get a shop that can handle Inconel and has worked with it before. You must also weld similar to stainless steel. Not sure of the type of rod or wire to use but call Hypertherm or Praxair if you are in Europe.

UFG

I concur with Morgan 23. By proper cutting, you can get this cylinder the right diameter (as measured by a PI tape), but it will not be round. 800mm dia. by 1.6 mm thick is extremely flimsey. Do not lay it on its side - it will become egg / oval shaped.

the extreme thinness relative to length and diameter precludes boring to ID. I suggest making a inside form of mild steel plate-say 1/2" thick (sectioned with angle iron runners bolted together for easy removal) The assembled form can then be mounted in a lathe and machined very easily to the precise OD (800 mm) needed to within 0.1 mm. Uniform and constant temperature will be needed to control thermal expansion, and the 'specification' must also have a reference temperature for the measurement. Then it is a relatively simple matter to wrap the the cut to size sheet around the form with a thin but finite seam gap and then fill weld the seam.

This vessel is not a low cost fabrication effort. Rolling will not result in a round vessel.

once pruchaesd 950 MT reactors 12' ID, 14" wall thickness, 110' T-T-- 1/4" thick 347 SS weld overlay, MACHINED ID to within 1 MM entire length!! JSW does fantastic work.

Once the form is removed, the 1.6 mm cylinder will become any shape that it wants to or as the wind blows it. I think this is the wrong direction to think in - accommodating the (lack of) roundness is a better way. Since it requires a precise diameter, I would guess that the cylinder in question fits into / around something that provides shape stability.

My company used to be able to fuse quartz tubes in this diameter. Quartz would save you money over inconel, and is a good alternative for high temp applications, and you can precision grind for close tolerances.

My process was in a rotary arc furnace, but the equipment was old and had to be retired.

You may be able to find a company in China willing to slip cast a tube to the dimes you need. With a high temperature furnace (gas) you can get a very good consolidation of the glass. The resulting opaque/semi-translucent material will also be a very excellent insulator.