Dizincification resistant brass alloys 1

AMedhat · Jan 10, 2017

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 · Jan 10, 2017

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-indu...unicipal-water-treatment/nsf-ansi-standard-61

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

MintJulep · Jan 10, 2017

This wasn't even that hard to find:

http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:01998L0083-20151027

metengr · Jan 10, 2017

http://www.diehl.com/en/diehl-metall/products/rods-tubes-profiles/dzr-brass.html

AMedhat · Jan 15, 2017

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 · Jan 15, 2017

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.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

btrueblood · Jan 16, 2017

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 C27541_0212.pdf

http://www.ldmbrass.com/back-site/upload/content/LDM BT300.pdf

blacksmith37 · Jan 16, 2017

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

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Dizincification resistant brass alloys 1

AMedhat

Mechanical

EdStainless

Materials

MintJulep

Mechanical

metengr

Materials

AMedhat

Mechanical

EdStainless

Materials

btrueblood

Mechanical

blacksmith37

Materials

Similar threads

Part and Inventory Search

Sponsor