Better material than EURONORM 1.4571 1

[Speedy]

I have a component made from EURONORM 1.4571 (aka DIN W1.4571). This is a Titanium Stabilized Austenite Stainless Steel.

The application is a machined threaded part that acts as a shield for a thermocouple in a high temperature/pressure combustion chamber.

The problem with the existing material is as follows;
At low combustion pressures the detected rise in temperature is not sufficient enough to allow for ignition detection. To avoid lowering the temperature threshold we have machined off some of the Outer Diameter on the part. This works fine but greatly reduces the life of the component. It simply gets fried a lot sooner.

My question is - Is there any other material that would be more suitable for this application, ideally something with a higher thermal conductivity yet tough enough to survive the harsh environment.

Thanks in advance,
Speedy

 

[EdStainless]

How hot is the max temp? I wouldn't expect much life out of 316Ti at temps over 1600F.
My first thought is to go to 309 or better yet 310. You won't get any better conductivity, but they will hold up so much better that you can afford thinner walls.
There are a lot of material with better high temp oxidation resistance. It is a matter of cost and availability. You could try high Cr ferritic alloys (26-1, 446) or you could go to Ni based alloys meant for high temp service. Alloys like 625, 718 and X are in a different league from what you are using now.

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[TVP]

FYI, the nickel alloys mentioned by EdStainless will have approximately the same thermal conductivity or slightly lower than Type 316. Type 316 is ~ 16 W/mK while Inconel X is ~ 9 and Inconel 600 is ~ 14.8 (all RT values).