We have some Inconel plates that are being sent out for heat treating.
The work instructions say to make sure the Inconel is absolutely clean and free from all oil, paint, grease and shop soil.
Also it says the fuel for heating must be extremely low in sulfur.
I'm curious as to why? and what is going on to this material during heat treating. This material and process is completely new to me.
(BTW I had to ask the guys to stop using WD-40 to get the bolts on the fixture loose that clamps the plates together)
Thanks
Ladies and Gentlemen,
Start point the maker of the material
Special Metals Corporation, New Hartford, New York, USA
Phone: +1.315.798.2900
Toll-free in the USA: 1.800.334.8351
Fax: +1.315.798.2016
info@specialmetals.com
. My job bet on I would call them. Guess is the application of the piece.
. I hope this is helpful.
Sincerely
Len Andersen weld@spemail.org
914-536-7101 / 212-839-6599 8-4 New York Time , 4042 FAX , Co-worker 6381 / 914-237-7689 (H)
POB 1529 / NYC 10116-1529 ( $1100 per year Caller Box GPO NYC / Most Secure Service At Largest Post Office
By 803056 
Date 04-13-2013 02:54
Edited 04-13-2013 02:58
Sulfur and nickel simply do not get along. Welded, forged, cast, or machined, it doesn't matter. High sulfur content in the fuel used to heat treat the nickel will cause serious problems. There is no alternative other than to scrap the parts that are exposed to the sulfur contamination.
The sulfur can come from any number of sources such as cutting fluids, cleaning solvents, rags, marking pens, paints, and of course fuel oil or gas used for heat treating.
Al
Clean it with alcohol, then wipe clean & store on lint free paper or cloth and cover to help maintain a sulphur free surface... Handle with super clean gloves prior to sending the plates to the heat treater... Repeat instructions to heat treater. 
