C28500
C28500 Spec SheetC28500 is a lead-free material which is however quite suitable for machining Due to its structural constitution. C28500 can be therefore used as a cost-effective Replacement for conventional lead-containing machining brass provided that it must not meet high requirements as regards mechanical properties and corrosion Resistance.
Chemical Composition
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 57 | 59 |
| Pb | – | 0.25 |
| Fe | – | 0.35 |
| Total Others | – | 0.90 |
| Zn | Remainder | |
Mechanical properties according to ASTM B927 (as per temper HO2)
| Range (inch) | UTS Min (ksi) |
UTS Max (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness | ||
|---|---|---|---|---|---|---|---|
| Hardness Min (HRB) |
Hardness Max (HRB) |
||||||
| Round (Dia) | 0.059 – 0.500 | 69 | – | 43 | 8 | – | – |
| 0.500 – 1.000 | 65 | – | 36 | 12 | – | – | |
| 1.000 – 2.953 | 59 | – | 26 | 16 | – | – | |
| Hex (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 | – | – |
| Thickness: 0.500 – 1.000 | 65 | – | 36 | 12 | – | – | |
| Thickness: 1.000 – 1.969 | 59 | – | 26 | 16 | – | – | |
| Range (mm) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| 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 | 8 | – | – |
| 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 |
| Density lb/cu in at 68°F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity %IACS at 68°F | 29 |
| Thermal Conductivity BTU/sq ft/ft hr/°F at 68°F | 58 |
| Coefficient of Thermal Expansion 68–212 × 10⁻⁶ per °F (68–212°F) | 11 |
| Coefficient of Thermal Expansion 68–572 × 10⁻⁶ per °F (68–572°F) | 121 |
| Specific Heat BTU/lb/°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 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 |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 100 |
| Machinability Rating | 60 |
Typical Uses
Fasteners
