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C27200
C27200
UNS C27200 (standardized under ASTM B36 / B36M for plate, sheet, strip, and rolled bar, ASTM B134 for wire, and ASTM B587 for welded pipe; historically known as Yellow Brass, 63% or CuZn37) is a single-phase (α) wrought alpha brass. Formulated with 63.0% to 68.5% copper and a zinc balance, C27200 offers a balance between mechanical strength, cold formability, and corrosion resistance. Because its copper content sits above the 63% threshold, C27200 retains a fully face-centered cubic alpha crystal structure at room temperature. This single-phase structure provides high ductility, making C27200 one of the standard alloys for deep drawing, spinning, bending, and severe cold forming.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 62.00 | 65.00 |
Pb | – | 0.07 |
Fe | – | 0.07 |
Total Others | – | 0.30 |
Zn | Remainder | |
Mechanical Properties According To ASTM B36 (As Per Temper HO2)
Range (Inch) |
From |
To |
UTS Min (ksi) |
UTS Max (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| Round (Dia) | 0.059 |
2.953 |
56 |
66 |
– |
– |
60 |
76 |
| Hex (A/F) | 0.118 |
2.756 |
56 |
66 |
– |
– |
60 |
76 |
| Square (A/F) | 0.118 |
2.362 |
56 |
66 |
– |
– |
60 |
76 |
Range (mm) |
From |
To |
UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| Round (Dia) | 1.5 |
75 |
385 |
455 |
– |
– |
60 |
76 |
| Hex (A/F) | 3 |
70 |
385 |
455 |
– |
– |
60 |
76 |
| Square (A/F) | 3 |
60 |
385 |
455 |
– |
– |
60 |
76 |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 27.6 |
| 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 |
|
| No fabrication properties for this alloy. |
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