Alternative material

[deaconp]

Please can anybody help???

I am looking for a replacement material for an exsiting component.

The material I currently have is a BE Cu material with a yield of 110000 PSI and UTS of 140000 PSI I require a replacement material with the same properties and NACE complient. But also has to be fit for service in a high Mercury well environment.

Can Anybody offer me a solution on materials available

 

[TVP]

Can you provide some additional details? What is the application, temperature, nature of loading (static, impact, fatigue, etc.), etc. Which NACE standard does it need to meet? There are a variety of ferrous or nickel-based alloys that can attain the requisite mechanical properties, but the environmental factors need to be clarified before I would give you any suggestions. Also, can you provide some additional details on what constitutes a "high mercury" environment?

 

[Hush]

If you're talking NACE MR0175, Inconel 718 might do the trick for you. Yield 120 ksi & UT 150 ksi solution annealed and aged to 40 HRC max.

http://www.specialmetals.com/products/publication/tech_bulletin_718.pdf

http://hgtech.com/Corrosion/Liquid Mercury Corrosion.htm

I understand that the better your finish the more resistant the material.

Also, is it possible to use a protective coating?

 

[NickE]

I'm assuming that you are using Be-Cu because of its conductivity. You might want to try Brush Wellman Be-Ni alloy 360.

In the 1/2 hard condition has similar properties as 17-7Ph condition C. And is almost pure Ni, thus has great corrosion properties. Resistivity is roughly 4.3x10-5 ohm-cm. about 1/3 that of 17-7.

not sure about the Hg corrosion properties.


Nick


(ohyeah alloy 360 also performs well at elevated temps.)

 

[deaconp]

Inconel 718 is Ok but if you are using it in oilfied you need to be careful the new stipulations in NACE are very stringent and call for a deltaphase testing.

you could try using inconel 925, which is good with mercury and Nace complient.

A good place to source is Special metals, who produce ignots, or for material suppliers try

HOWCO or Flange Fit.

hope this is of some sort of use

 

[EdStainless]

I presume that BeCu is being used because it is strong and nonmagnetic. Are magnetic properties important?

I would look at age hardening Ni alloy other than 718. Maybe 725 or even X-750.
I am not sure that alloys like 925 or a PH stainless will have enough corrosion resistance.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[rorschach]

most nickel alloys (925 included) will have problems with mercury. I'd definitely contact one of the metallurgy gurus up in Huntington (

http://www.specialmetals.com)

before going down that expensive road.