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LORDLUCAN (Mechanical) (OP)
30 Nov 04 12:20
Anybody know the parameters for machining PTA stellite #6? Speeds/feeds etc.
I reckon it's about 0.25m/sec and 6-8 cuts per mm with a soluble cutting oil.
Would anyone agree/conflict with this?
mrainey (Industrial)
30 Nov 04 12:36
Need more information about the type of machining you're doing, tools available, machines available, etc.

Manufacturing Freeware and Shareware

LORDLUCAN (Mechanical) (OP)
1 Dec 04 4:13
It's machining an offset cone profile on the I/D of a seat ring for a butterfly valve and mounted on a vertical borer. I'm positive we've got the correct tip tool which is Tungsten carbide with a 2 degree max positive top rake and minimal radius at the point.
mrainey (Industrial)
1 Dec 04 5:53
LORDLUCAN (Mechanical) (OP)
1 Dec 04 7:41
Thanks for the info mrainey. however this link only relates to the tooling, the area where we are experiencing problems is the actual stellite itself. On some of the rings the stellite is flaking away from the base material (stain.s 316). I wondered whether our machining parameters were incorrect or there was a flaw in the stellite. As I said we are turning an offset cone profile at 30 degrees. Maybe the intermittent cut is cause a shock load that pulls the stellite off or the Plasma transfered arc process requires vacuum fusion to achieve a metallurgical bond with the 316. I would like to hear from any body who has experience in machining stellite to perhaps put me on the right track.
tomwalz (Materials)
1 Dec 04 11:45
Try Louw DeJong

Nice guy, straight shooter and very knowledgeable.  Plus he works for the company that makes the materials.  

Tom Walz

Louw DeJong
Stoody Deloro Stellite
olympic (Mechanical)
22 Dec 04 14:39
Another good source for practical information regarding machining stellite is Emerson valve formerly Fisher Rosemount valve in Edmonton, Alberta, Canada.  A large percentage of the sour service valve components and bodies are welded stainless and then stellite coated.  They have a wealth of knowledge and many years of experience with machining it.

If Interested, I will email you direct a contact name and number.

LORDLUCAN (Mechanical) (OP)
23 Dec 04 4:12
Yes please olympic, the more information I can gather the better. Cheers.

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