Admiralty Brass flanges, long valued in marine and power-plant service for their resistance to seawater corrosion and dezincification.
Grades & Standards
Available grades and the manufacturing standards commonly applied to admiralty brass flanges.
Standards Explained
Technical Data
Admiralty Brass (C44300) is the standard inhibited grade for seawater & condenser service flanges.
Chemical Composition (% by weight)
| Grade | UNS No. | Cu | Sn | As (Inhibitor) | Pb (max) | Zn |
|---|---|---|---|---|---|---|
| Admiralty Brass | C44300 | 70.0 – 73.0 | 0.9 – 1.2 | 0.02 – 0.06 | 0.07 | Remainder |
Composition per ASTM B111. Arsenic addition inhibits dezincification in seawater service. Mill test certificates issued per EN 10204 3.1 on request.
Mechanical Properties — Admiralty Brass (C44300), Wrought
| Property | Annealed | Light Drawn |
|---|---|---|
| Tensile Strength | 330 MPa | 370 MPa |
| Yield Strength | 125 MPa | 205 MPa |
| Elongation | 65% | 40% |
| Density | 8.53 g/cm³ | 8.53 g/cm³ |
Typical values; exact temper/casting method confirmed at enquiry stage.
Dimensions
Outside diameter, thickness, hub diameter & bolt circle for threaded cast copper alloy flanges, per ASME B16.24, Class 150. Class 300 available on request.
| NPS | Flange OD (in) | Thickness T (in) | Hub Dia. (in) | Bolt Circle (in) | No. of Bolts | Bolt Dia. (in) |
|---|---|---|---|---|---|---|
| 1/2" | 3-1/2 | 5/16 | 1-3/16 | 2-3/8 | 4 | 1/2 |
| 3/4" | 3-7/8 | 11/32 | 1-1/4 | 2-3/4 | 4 | 1/2 |
| 1" | 4-1/4 | 3/8 | 1-15/16 | 3-1/8 | 4 | 1/2 |
| 1-1/2" | 5 | 7/16 | 2-9/16 | 3-7/8 | 4 | 1/2 |
| 2" | 6 | 1/2 | 3-1/16 | 4-3/4 | 4 | 3/4 |
| 3" | 7-1/2 | 5/8 | 4-1/4 | 6 | 4 | 3/4 |
| 4" | 9 | 11/16 | 5-5/16 | 7-1/2 | 8 | 3/4 |
| 6" | 11 | 13/16 | 7-9/16 | 9-1/2 | 8 | 3/4 |
| 8" | 13-1/2 | 15/16 | 9-11/16 | 11-3/4 | 8 | 3/4 |
Dimensions per ASME B16.24, Class 150 threaded cast copper alloy flanges (bolt circle & bolting dimensions are shared with ASME B16.5 steel flanges for joint compatibility). Class 300 dimensions available on request.
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