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C46400
C46400
UNS C46400 (standardized under ASTM B21 / ASTM B171) is the global standard for unalloyed Naval Brass. Engineered by adding approximately 0.75% to 1.0% tin to a nominal 60/40 copper-zinc matrix, this alloy is designed specifically to prevent dezincification and resist galvanic corrosion in marine, brackish water, and industrial fluid environments. It provides high mechanical strength, good resistance to wear and cavitation, and hot workability for heavy-duty marine hardware and heat exchanger fabrication.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 59.00 | 62.00 |
Pb | – | 0.20 |
Sn | 0.50 | 1.00 |
Fe | – | 0.10 |
Total Others | – | 0.50 |
Zn | Remainder | |
Mechanical Properties According To ASTM B371 (As Per Temper HO2)
Range (Inch) |
From |
To |
UTS Min (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| Round (Dia) | 0.059 | 0.500 | 60 | 27 | 22 | – | – |
0.500 | 1.000 | 60 | 27 | 25 | 60 | 80 |
|
1.000 | 2.000 | 58 | 26 | 25 | 55 | 80 |
|
2.000 | 2.953 | 54 | 25 | 25 | 55 | 80 |
|
| Hex (A/F) | 0.118 | 0.500 | 60 | 27 | 22 | – | – |
0.500 | 1.000 | 60 | 27 | 25 | 60 | 80 |
|
1.000 | 2.000 | 58 | 26 | 25 | 55 | 80 |
|
2.000 | 2.756 | 54 | 25 | 25 | 55 | 80 |
|
| Square (A/F) | 0.118 | 0.500 | 60 | 27 | 22 | – | – |
0.500 | 1.000 | 60 | 27 | 25 | 60 | 80 |
|
1.000 | 2.362 | 58 | 26 | 25 | 55 | 80 |
|
| Rectangle (Thickness) | 0.1181 | 0.500 | 60 | 27 | 22 | – | – |
0.500 | 1.000 | 60 | 27 | 25 | 60 | 80 |
|
1.000 | 1.968 | 58 | 26 | 25 | 55 | 80 |
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| Round (Dia) | 3 | 12 | 415 | 185 | 22 | – | – |
12 | 25 | 415 | 185 | 25 | 60 | 80 |
|
25 | 50 | 400 | 180 | 25 | 55 | 80 |
|
50 | 75 | 370 | 170 | 25 | 55 | 80 |
|
| Hex (A/F) | 3 | 12 | 415 | 185 | 22 | – | – |
12 | 25 | 415 | 185 | 25 | 60 | 80 |
|
25 | 50 | 400 | 180 | 25 | 55 | 80 |
|
50 | 70 | 370 | 170 | 25 | 55 | 80 |
|
| Square (A/F) | 3 | 12 | 415 | 185 | 22 | – | – |
12 | 25 | 415 | 185 | 25 | 60 | 80 |
|
25 | 50 | 400 | 180 | 25 | 55 | 80 |
|
50 | 60 | 370 | 170 | 25 | 55 | 80 |
|
| Rectangle (Thickness) | 3 | 12 | 415 | 185 | 22 | – | – |
12 | 25 | 415 | 185 | 25 | 60 | 80 |
|
25 | 50 | 400 | 180 | 25 | 55 | 80 |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°C | 880-915 |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.304 |
| Specific Gravity | 8.41 |
| Electrical Conductivity % IACS at 68°F | 26 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.8 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas shielded Are Welding | Fair |
| Coated Metal Are Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Fair |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 90 |
| Machinability Rating | 30 |
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