Dizincification resistant brass alloys

Question

Dizincification resistant brass alloys

AMedhat (Mechanical)

(OP)

10 Jan 17 08:33

Dear all,

Is there any regulation in Europe that prohibits the use of dezincification resistant brass alloys in contact with Potable water?

We are facing a pitting corrosion failure with solenoid valves made of CuZn40Pb2 (CW617N) used in contact with unbottled drinking water. However when we contacted the supplier asking for DZR alloy, he informed that there is a regulation in US and Europe that prohibits the use of DZR brass alloys with potable water.

Thanks in advance and regards
A.Medhat

EdStainless (Materials) · Answer 1 · 2017-01-10 14:40:26

In the US you go to NSF for a list of acceptable materials of construction for drinking water systems.
Specifically NSF 61
http://www.nsf.org/services/by-industry/water-wast...

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P.E. Metallurgy, Plymouth Tube

MintJulep (Mechanical) · Answer 2 · 2017-01-10 18:03:40

This wasn't even that hard to find:

http://eur-lex.europa.eu/legal-content/EN/TXT/?uri...

metengr (Materials) · Answer 3 · 2017-01-10 23:46:17

http://www.diehl.com/en/diehl-metall/products/rods...

AMedhat (Mechanical) · Answer 4 · 2017-01-15 09:46:19

Dear all,

Thanks for the information

@MintJulep: this is for the water quality parameters, I couldn't find any data about the DZR brass alloys that are allowed to be used with potable water

Thanks all
Regards

EdStainless (Materials) · Answer 5 · 2017-01-15 19:57:06

The current regs in EU and US prohibit the use of materials with this much lead in potable water applications, even if they work fine.

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P.E. Metallurgy, Plymouth Tube

btrueblood (Mechanical) · Answer 6 · 2017-01-16 18:49:39

Some DZR alloys have significant additions of arsenic, especially the forging alloys intended to replace CW617 (e.g. 27451). There are other alloys available, generally with higher copper content, that have no toxic alloy content and can be hot-formed/forged...but your supplier may not have access to them, or his equipment may not be set up to handle those alloys (I believe the forging temperature is significantly higher due to the higher Cu content, and/or the machining is more difficult)?

Most common lead free alloy is C27450, but has poor DZR. Note this is true only when chloride content is high and/or ph is acidic - can your user adjust/control the pH of their water?

DZR lead free alloys (C27451):
http://muellerindustriesipd.com/pdfs/Ecostream%20C...
http://www.ldmbrass.com/back-site/upload/content/L...

blacksmith37 (Materials) · Answer 7 · 2017-01-17 02:37:17

Inhibited Admiralty brass has 0.04% As to make it DZR .

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Dizincification resistant brass alloys