If brass alloy contacts to water or seawater, zinc may salectively elutes from the brass allow surface, which is called "zinc-free corrosion".
The UR series are copper alloy materials with excellent dezincification corrosion resistance. We can provide optimum materials accordingly to the application. UR30ST is suitable alloy especially for the wire of Aquaculture.
Faucet fittings · Hot water supply piping parts · Heat exchanging parts (UR31,34)
Wire for Aquaculture (UR30ST)
The chemical components of UR series are as follows.
The physical properties of UR series are as follows.
|Specific Gravity (293K)||8.5||8.5||8.5|
|coeffcient of thermal Expansion
|Modulus of Elasticity
The mechanical properties of UR series are as follows.
It shows corrosion resistance of UR series.
UR series have excellent dezincification corrosion resistance.
|Alloy||Ø||ISO 6509 test||JBMA T-303 test|
|maximum corrosion depth
|corrosion form||maximum corrosion depth
|UR30ST||Ø4||<10||<10||no dezincification||60||type Ⅰ|
|UR31||Ø20||20||<10||no dezincification||65||type Ⅰ|
|Ø35||20||<10||no dezincification||65||type Ⅰ|
|UR34||Ø28||330||180||preferential corrosion of β phase||–||–|
|forging＊||30||<10||preferential corrosion of γ phase||70||type Ⅰ|
It satisfies the stress corrosion cracking test by JIS method and ASTM method (both conducted in ammonia atmosphere).
Machinability of UR 31 is almost equal to C 3604 and has excellent machinability.
|Drill test||Three force components|
The hot forging temperature of UR 34 is preferable in a range of 700℃ to 820℃ so as to be equivalent hot deformation resistance to C3771 by raising 50℃ higher than 650℃ to 770 ℃ which is the hot forging temperature of C3771.
UR30ST has excellent antifouling properties (properties that prevent the adherence of marine organisms such as algae and shellfish), and it is used as a wire of crawls for sea surface culturing.
Galvanized steel wire crawl (4 months passed after installation)
UR30ST crawl (2 years passed after installation)