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C33500
C33500
UNS C33500 (standardized under ASTM B135 for seamless brass tubes) is a low-leaded yellow brass alloy engineered specifically to bridge the gap between cold workability and machinability. Containing approximately 62.5% to 66.5% copper and a controlled 0.25% to 1.0% lead, this alpha ($\alpha$) brass provides enough ductility for flaring, bending, expanding, and swaging without splitting, while the small lead addition acts as an internal chip breaker to improve drilling, threading, and cutting operations over completely unleaded brasses.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 62.00 | 65.00 |
Pb | 0.25 | 0.70 |
Fe | – | 0.15 |
Total Others | – | 0.4 |
Zn | Remainder | |
Mechanical Properties According To ASTM B453 (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 |
0.500 |
57 |
80 |
25 |
7 |
60 |
80 |
0.500 |
1.000 |
55 |
70 |
25 |
10 |
50 |
75 |
|
1.000 |
2.953 |
50 |
62 |
20 |
15 |
40 |
70 |
|
| Hex (A/F) | 0.118 |
0.500 |
57 |
80 |
25 |
7 |
60 |
80 |
0.500 |
1.000 |
55 |
70 |
25 |
10 |
50 |
75 |
|
1.000 |
2.756 |
50 |
62 |
20 |
15 |
40 |
70 |
|
| Square (A/F) | 0.118 |
0.500 |
57 |
80 |
25 |
7 |
60 |
80 |
0.500 |
1.000 |
55 |
70 |
25 |
10 |
50 |
75 |
|
1.000 |
2.362 |
50 |
62 |
20 |
15 |
40 |
70 |
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 |
12 |
395 |
555 |
170 |
7 |
60 |
80 |
12 |
25 |
380 |
485 |
170 |
10 |
50 |
75 |
|
25 |
75 |
345 |
425 |
140 |
15 |
40 |
70 |
|
| Hex (A/F) | 3 |
12 |
395 |
555 |
170 |
7 |
60 |
80 |
12 |
25 |
380 |
485 |
170 |
10 |
50 |
75 |
|
25 |
70 |
345 |
425 |
140 |
15 |
40 |
70 |
|
| Square (A/F) | 3 |
12 |
395 |
555 |
170 |
7 |
60 |
80 |
12 |
25 |
380 |
485 |
170 |
10 |
50 |
75 |
|
25 |
60 |
345 |
425 |
140 |
15 |
40 |
70 |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1700 |
| Melting Point – Solidus°F | 1650 |
| Density lb/cu in. at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity % IACS at 68°F | 26 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.3 |
| 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 | Good |
| Oxyacetylene Welding | Fair |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Fair |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Poor |
| Machinability Rating | 60 |
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