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Heat Treating 330 SS in vacuum

Heat Treating 330 SS in vacuum

Heat Treating 330 SS in vacuum

(OP)
When running 330 stainless steel at 2250F in a vacuum of 5 -5 torr or better, should I be concerned about pulling out alloying elements such as chrom?

RE: Heat Treating 330 SS in vacuum

The temperature seems high. Annealing is given at 2050 to 2200 F. From a diagram of Vapor pressure vs. Temperature, equilibrium for Chrome at that temperature is about
2*10^-2 torr. Your concern is probably correct unless treatment is very short. Could you backfill with inert gas?

http://www.welding-advisers.com/

RE: Heat Treating 330 SS in vacuum

Why vac instead of hydrogen?
yes, enven in H you get a little Cr vapor, it recondenses on the surface.  It is very superficial.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: Heat Treating 330 SS in vacuum

Did you observe any Ni evaporation in 330 under vacuum. A few of my customers who have used 330 castings under vacuum have made this report.

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