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C38000
C38000
UNS C38000 (standardized under ASTM B455 for copper alloy extruded shapes, with related specifications in ASTM B16 and ASTM B124) is a leaded (α + β) duplex brass known commercially and architecturally as Architectural Bronze (or Leaded 57/40 Extrusion Brass). Formulated with 55.0% to 60.0% copper, a high free-machining lead content of 1.5% to 2.5%, and an optional trace addition of aluminum/tin, C38000 is engineered specifically for the hot extrusion of sharp, intricate, and thin-walled solid or hollow profiles.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 55.00 | 60.00 |
Pb | 1.50 | 2.50 |
Fe | – | 0.35 |
Al | – | 0.50 |
Sn | – | 0.30 |
Total Others | – | 0.50 |
Zn | Remainder | |
Mechanical Properties According To ASTM B455 (As Per Temper HO2)
Range (Inch) |
From |
To |
UTS Min (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
|
| Round (Dia) | 0.1181 |
2.9527 |
48 |
16 |
15 |
– |
– |
|
| Hex (A/F) | 0.1181 |
2.7559 |
48 |
16 |
10 |
– |
– |
|
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
|
| Round (Dia) | 1.5 |
75 |
330 |
110 |
15 |
– |
– |
|
| Hex (A/F) | 3 |
70 |
330 |
110 |
15 |
– |
– |
|
Physical Properties |
Metric |
English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
Fabrication Properties
| Technique | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 95.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
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