Replacement of Hastelloy C276

[BexBex1000]

Hi People

Can anybody help me? I currently use a mixture of 316L stainless and Hastelloy C276 in the manufacture of some magnet driven pumps. The Hastelloy is used because the application is as a thin can which sits between the inner magnet and the outer magnet for containment. It is used instead of 316L because it has:
A) very low iron content (so the magnets do not heat it up via eddy curents)
B) Good mechanical strength as the can is very thin walled.
C) Good chemical resistance which is important but only needs to be as good as if not better than 316L

The price of Hastelloy however is going through the roof and I would like to look at options to replace the Hastelloy C276, has any of you good people got any ideas?

 

[EdStainless]

How much corrosion resistance do you need? What diameter and wall are you using?
One of the 6%Mo stainless grades would fall in between for corrosion resistance, and they would be stronger than C276. There are lower alloy choices as well.

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[BexBex1000]

Hi EdStainless

Like I say earlier, im not looking for fantastic corrosion reistance, just enough to cover the corrosion properties of 316L stainless as the majority of the product is made from 316L. Diameter wise we are talking around 2 inch (50mm) to 4 inch (100mm) cans with a wall thickness of around 0.1 inch (2.5mm).

You suggested one of the 6%Mo stainless steels, can you give me an example and more importantly the iron content?

Thanks

 

[moltenmetal]

Titanium gr 5? Super strong. Check out the cost per finished article though- since it's less dense, cost per pound might scare you off unnecessarily. But it appears that the commodities price increase is a tide which is raising all the boats- chances are that the titanium prices have gone up similar to the nickel prices.

 

[arunmrao]

How about Monel metal. If you could use some of the Inconels or Nimonics /

 

[EdStainless]

After all, he is looking to reduce cost. You won't get there with a 65% Ni alloy or Ti (these days).
The only issue with using Ti (or Cu alloys) in these applications is that the lower modulus can lead to unacceptable levels of defection.

My earlier post has vanished. I'll try again.
A typical 6%Mo grade is AL-6XN. What really matters in electrical condutivity, since that is what relates to Eddy Currents. As I recall for C276 you are about 120-130, for AL-6XN or 904L you will be 95-100, and for 316 you will be 70-75. (and no, I don't remember the units off of the top of my head)
If you want to talk specific sizes contact me.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm