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C27450
C27450
UNS C27450 (standardized under ASTM B927 for brass rod, bar, and shapes, and ASTM B124 for forging stock) is a low-lead wrought copper-zinc alloy formulated to comply with strict environmental and health regulations regarding potable water contact. Formulated with 60.0% to 65.0% copper, a zinc balance, and a tightly restricted maximum lead content of 0.25%, C27450 provides an economical transition between traditional leaded machining brasses and completely lead-free engineered alloys. Operating on a dual-phase or high-zinc alpha-beta transition similar to CuZn37, C27450 satisfies modern global drinking water standards (such as NSF/ANSI 372 and RoHS Exemption 6(c) compliance) while delivering dependable mechanical strength, cold-forming plasticity, and moderate machinability.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 60.00 | 65.00 |
Pb | – | 0.25 |
Fe | – | 0.35 |
Total Others | – | 0.50 |
Zn | Remainder | |
Mechanical Properties According To ASTM B927 (As Per Temper HO2)
Range (Inch) |
From |
To |
UTS Min (Ksi) |
PS Min (Ksi) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 0.059 |
0.500 |
53 |
33 |
10 |
– |
– |
0.500 |
1.000 |
48 |
30 |
13 |
– |
– |
|
1.000 |
2.953 |
43 |
28 |
15 |
– |
– |
|
| Hexagon (A/F) | 0.118 |
0.500 |
53 |
33 |
10 |
– |
– |
0.500 |
1.000 |
48 |
30 |
13 |
– |
– |
|
1.000 |
2.756 |
43 |
28 |
15 |
– |
– |
|
| Square (A/F) | 0.118 |
0.500 |
53 |
33 |
10 |
– |
– |
0.500 |
1.000 |
48 |
30 |
13 |
– |
– |
|
1.000 |
2.362 |
43 |
28 |
15 |
– |
– |
|
| Rectangle (Thickness) | 0.118 |
0.500 |
53 |
33 |
10 |
– |
– |
0.500 |
1.000 |
48 |
30 |
13 |
– |
– |
|
1.000 |
1.969 |
43 |
28 |
15 |
– |
– |
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 |
12 |
365 |
230 |
10 |
– |
– |
12 |
25 |
330 |
205 |
13 |
– |
– |
|
25 |
75 |
295 |
195 |
15 |
– |
– |
|
| Hex (A/F) | 3 |
12 |
365 |
230 |
10 |
– |
– |
12 |
25 |
330 |
205 |
13 |
– |
– |
|
25 |
70 |
295 |
195 |
15 |
– |
– |
|
| Square (A/F) | 3 |
12 |
345 |
170 |
10 |
– |
– |
12 |
25 |
310 |
115 |
20 |
– |
– |
|
25 |
50 |
275 |
105 |
20 |
– |
– |
|
| Rectangle (Thickness) | 3 |
12 |
345 |
170 |
10 |
– |
– |
12 |
25 |
310 |
115 |
20 |
– |
– |
|
25 |
50 |
275 |
105 |
20 |
– |
– |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.31 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 27 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.4 |
| 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 Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 35 |
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