70/29/1 copper-zinc-tin alloy for condenser & heat-exchanger tube.
Material Overview
Admiralty Brass (70/29/1 copper-zinc-tin) is a classic condenser and heat-exchanger tube material, long valued in marine and power-plant service for its resistance to seawater corrosion and dezincification.
Grades & Standards
Available grades and the international standards commonly applied to admiralty brass pipes.
Technical Data
Admiralty Brass (C44300) is the standard inhibited grade for heat exchanger & condenser tube.
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 |
| Admiralty Brass (Arsenical) | C44400 | 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)
| Property | Annealed | Half-Hard / 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 confirmed at enquiry stage.
Dimensions
Commonly stocked tube sizes, plus Schedule 40 & 80 pipe dimensions for cross-reference. Custom OD, wall thickness & lengths manufactured on request.
Tube & Pipe — OD × Wall Thickness
| OD (mm) | OD (in) | Wall Thickness (mm) | Form |
|---|---|---|---|
| 12.70 | 1/2" | 0.71 / 0.91 | Coiled Tube |
| 19.05 | 3/4" | 0.89 / 1.02 | Coiled Tube / Straight Pipe |
| 25.40 | 1" | 1.02 / 1.22 | Straight Pipe |
| 38.10 | 1-1/2" | 1.22 / 1.63 | Straight Pipe |
| 50.80 | 2" | 1.63 / 2.11 | Straight Pipe |
| 101.60 | 4" | 2.77 / 3.40 | Straight Pipe |
Pipe — NPS & Schedule Reference
| NPS | OD (in) | Sch. 40 Wall (in) | Sch. 80 Wall (in) |
|---|---|---|---|
| 1/2" | 0.840 | 0.109 | 0.147 |
| 3/4" | 1.050 | 0.113 | 0.154 |
| 1" | 1.315 | 0.133 | 0.179 |
| 1-1/2" | 1.900 | 0.145 | 0.200 |
| 2" | 2.375 | 0.154 | 0.218 |
| 3" | 3.500 | 0.216 | 0.300 |
| 4" | 4.500 | 0.237 | 0.337 |
| 6" | 6.625 | 0.280 | 0.432 |
Pipe is most commonly ordered directly by OD × wall thickness rather than schedule; the NPS/Schedule table above is shown for cross-reference against steel-pipe-based specifications. Full mill drawings & tolerances issued with every quotation.
Send us your drawings, sizes and standards — our team will get back to you with a detailed quotation for your Copper-Nickel, Copper, Brass or Bronze piping requirement.
