Dezincification corrosion resistance alloy
UR30ST
C45470
- corrosion and wear resistance
If brass alloy contacts to water or seawater, zinc may selectively elute from the brass alloy
surface, which is called "dezincification".
UR30ST is a copper alloy material with excellent dezincification corrosion resistance. We can
provide the optimum materials according to your application. UR30ST is particularly suitable for
aquaculture wire application.
Positioning map
Main features
- Good dezincification resistance to corrosion.
- Good seawater resistance
- Good antifouling property
Chemical composition
The chemical components of UR30ST is as follows.
| Cu | Pb | Fe | Sn | Ni | Al | Zn | |
|---|---|---|---|---|---|---|---|
| UR30ST | 67.0 | 0.7 | 0.6 | Rem. |
Technical Data
Physical properties
The physical properties of UR30ST is as follows.
| Property | Representative Value |
|---|---|
| UR30ST | |
| Specific Gravity (293K) | 8.5 |
| coeffcient of thermal Expansion (×10-6/K：293～573K) |
21 |
| electrical conductivity (%IACS:293K) |
20 |
| Modulus of Elasticity (kN/mm²:293K) |
103 |
Mechanical properties (Actual example: LD direction)
The mechanical properties of UR30ST is as follows.
| alloy | UR30ST |
|---|---|
| Shape | wire |
| size | Ø4 |
| Temper | 1/4H |
| Tensile Strength (N/mm²) |
420 |
| Yield Strength (N/mm²) |
- |
| Elongation (%) |
23 |
| Hardness (HRB) |
52 |
Corrosion resistance
It shows corrosion resistance of UR30ST.
UR30ST have excellent dezincification corrosion resistance.
| Alloy | Ø | ISO 6509 test | JBMA T-303 test | |||
|---|---|---|---|---|---|---|
| maximum corrosion depth （μm） |
average corrosion （μm） |
corrosion form | maximum corrosion depth （μm） |
evaluation | ||
| UR30ST | Ø4 | <10 | <10 | no dezincification | 60 | type Ⅰ |
Stress corrosion cracking resistance
It satisfies the stress corrosion cracking test by JIS method and ASTM method (both conducted in ammonia atmosphere).
| JIS | ASTM | |
|---|---|---|
| UR30ST | ○ | ○ |
Antifouling properties
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.
Sea farming picture
Galvanized steel wire crawl (4 months passed after installation)
UR30ST crawl (2 years passed after installation)