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C28500
C28500
UNS C28500 (standardized under specifications such as ASTM B927 and ASTM B124, and closely aligned with the European designation EN CW510L / CuZn42) is a high-zinc, duplex (α + β) structural brass formulated to deliver high tensile strength, excellent hot-working plasticity, and compliance with low-lead environmental directives. Containing 57.0% to 59.0% copper and a zinc balance with a tightly controlled maximum lead content of 0.25%, C28500 provides a high-performance, eco-friendly alternative to traditional high-lead machining brasses. With a high proportion of the harder beta (β) phase, C28500 offers superior rigidity and structural strength, making it ideal for forged components, threaded fittings, fasteners, and sanitary hardware.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 57.00 | 59.00 |
Pb | – | 0.25 |
Fe | – | 0.35 |
Total Others | – | 0.90 |
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 |
69 |
43 |
8 |
– |
– |
0.500 |
1.000 |
65 |
36 |
12 |
– |
– |
|
1.000 |
2.953 |
59 |
26 |
16 |
– |
– |
|
| Hexagon (A/F) | 0.118 |
0.500 |
69 |
43 |
8 |
– |
– |
0.500 |
1.000 |
65 |
36 |
12 |
– |
– |
|
1.000 |
2.756 |
59 |
26 |
16 |
– |
– |
|
| Square (A/F) | 0.118 |
0.500 |
69 |
43 |
8 |
– |
– |
0.500 |
1.000 |
65 |
36 |
12 |
– |
– |
|
1.000 |
2.362 |
59 |
26 |
16 |
– |
– |
|
| Rectangle (Thickness) | 0.118 |
0.500 |
69 |
43 |
8 |
– |
– |
0.500 |
1.000 |
65 |
36 |
12 |
– |
– |
|
1.000 |
1.969 |
59 |
26 |
16 |
– |
– |
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 |
12 |
480 |
300 |
8 |
– |
– |
12 |
25 |
450 |
250 |
12 |
– |
– |
|
25 |
75 |
410 |
180 |
18 |
– |
– |
|
| Hex (A/F) | 3 |
12 |
480 |
300 |
18 |
– |
– |
12 |
25 |
450 |
250 |
12 |
– |
– |
|
25 |
70 |
410 |
180 |
18 |
– |
– |
|
| Square (A/F) | 3 |
12 |
480 |
300 |
8 |
– |
– |
12 |
25 |
450 |
250 |
12 |
– |
– |
|
25 |
50 |
410 |
180 |
18 |
– |
– |
|
| Rectangle (Thickness) | 3 |
12 |
480 |
300 |
8 |
– |
– |
12 |
25 |
450 |
250 |
12 |
– |
– |
|
25 |
50 |
410 |
180 |
18 |
– |
– |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Densitylb/cu in. at 68°F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity% IACS at 68°F | 29 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 58 |
| Coefficient of Thermal Expansion 68-21210⁻⁶ per °F (68 – 212°F) | 11 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 121 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 12300 |
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 | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 100 |
| Machinability Rating | 60 |
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