Vacuum Heat Treating 316L & 2205 Parts

[julieangel]

Hi Stainless Steel Experts,

Is it possible to vacuum anneal (bright anneal) 316L and duplex 2205 parts at the same time? The annealing temps are almost the same (1900F/1040C) for both alloys and parts' thickness is less than 0.6 inches. I know 316L parts can be bright annealed with no major problems but how about 2205? Does 2205 requires faster cooling (gas quench) times than 316L? Any input/recommendation will be highly appreciated. Thanks!

 

[EdStainless]

The faster cooling required by 2205 wont hurt 316, unless you are worried about distortion or residual stress.

1900F is very low for a 316 anneal. If there are any welds you need 2050F at least.

the phase balance in 2205 is a function of anneal temp.

You could run them together at 1925-1950F and cool very fast.

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P.E. Metallurgy, Plymouth Tube

 

[julieangel]

Thanks EdStainless for your input

 

[mcguire]

Ed
Aren't you concerned with nitrogen loss in the 2205 in a vacuum anneal?

Michael McGuire

 

[EdStainless]

McG, now, unless you are talking about long (over night) soaks at high vacuum I wouldn't worry. I have seen vacuum anneal of other high N alloys (austenitic) and there was no problem.

I will also point out to the original poster that t his is not a bright anneal. There will still be some amount of surface oxide on these parts. You can remove all of the oxide during the anneal stage, but some is bound to re-form during forced gas quench. A light pickling treatment would be required to assure optimal corrosion resistance.

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P.E. Metallurgy, Plymouth Tube