Bismuth Brass C49260 (also known as GEM Brass) is a lead-free, free-cutting brass alloy designed as a safer alternative to traditional leaded brass, offering excellent machinability while complying with RoHS environmental standards. It is widely used in high-speed screw machine work, forging, and general applications where lead-free materials are required.
Chemical Composition
| Elements |
Min (%) |
Max (%) |
| Cu |
58.00 |
63.00 |
| Zn |
Remainder |
| Bi |
0.50 |
1.80 |
| Pb |
0.00 |
0.09 |
| Fe |
0.00 |
0.50 |
| Sn |
0.00 |
0.50 |
| Cd |
0.00 |
0.001 |
| P |
0.05 |
0.15 |
| Si |
0.00 |
0.10 |
Mechanical Properties according To ASTM B974 C49260 (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) |
0.250 |
0.500 |
57 |
– |
25 |
7 |
– |
– |
| 0.500 |
1.000 |
55 |
– |
25 |
10 |
– |
– |
| 1.000 |
2.000 |
50 |
– |
20 |
15 |
– |
– |
| 2.000 |
4.000 |
45 |
– |
15 |
20 |
– |
– |
| Hex (A/F) |
0.250 |
0.500 |
57 |
– |
25 |
7 |
– |
– |
| 0.500 |
1.000 |
55 |
– |
25 |
10 |
– |
– |
| 1.000 |
2.000 |
50 |
– |
20 |
15 |
– |
– |
| 2.000 |
2.500 |
45 |
– |
15 |
20 |
– |
– |
| Square (A/F) |
0.250 |
0.500 |
57 |
– |
25 |
7 |
– |
– |
| 0.500 |
1.000 |
55 |
– |
25 |
10 |
– |
– |
| 1.000 |
2.000 |
50 |
– |
20 |
15 |
– |
– |
| 2.000 |
2.350 |
45 |
– |
15 |
20 |
– |
– |
| Octagon (A/F) |
0.250 |
0.500 |
57 |
– |
25 |
7 |
– |
– |
| 0.500 |
1.000 |
55 |
– |
25 |
10 |
– |
– |
| 1.000 |
2.000 |
50 |
– |
20 |
15 |
– |
– |
| 2.000 |
4.000 |
45 |
– |
15 |
20 |
– |
– |
|
Rectangle
|
Thickness |
0.250 |
0.500 |
50 |
– |
25 |
10 |
– |
– |
| Width |
0.500 |
1.000 |
| Thickness |
0.250 |
0.500 |
45 |
– |
17 |
15 |
– |
– |
| Width |
1.000 |
3.000 |
| Thickness |
0.500 |
2.000 |
45 |
– |
17 |
15 |
– |
– |
| Width |
0.500 |
2.000 |
| Thickness |
0.500 |
2.000 |
40 |
– |
15 |
20 |
– |
– |
| Width |
2.000 |
3.000 |
| Range (mm) |
From |
To |
UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| Round (Dia) |
6 |
12 |
395 |
– |
170 |
7 |
– |
– |
| 12 |
25 |
380 |
– |
170 |
10 |
– |
– |
| 25 |
50 |
345 |
– |
140 |
15 |
– |
– |
| 50 |
100 |
310 |
– |
105 |
20 |
– |
– |
| Hex (A/F) |
6 |
12 |
395 |
– |
170 |
7 |
– |
– |
| 12 |
25 |
380 |
– |
170 |
10 |
– |
– |
| 25 |
50 |
345 |
– |
140 |
15 |
– |
– |
| 50 |
100 |
310 |
– |
105 |
20 |
– |
– |
| Square (A/F) |
6 |
12 |
395 |
– |
170 |
7 |
– |
– |
| 12 |
25 |
380 |
– |
170 |
10 |
– |
– |
| 25 |
50 |
345 |
– |
140 |
15 |
– |
– |
| 50 |
100 |
310 |
– |
105 |
20 |
– |
– |
| Octagon (A/F) |
6 |
12 |
395 |
– |
170 |
7 |
– |
– |
| 12 |
25 |
380 |
– |
170 |
10 |
– |
– |
| 25 |
50 |
345 |
– |
140 |
15 |
– |
– |
| 50 |
100 |
310 |
– |
105 |
20 |
– |
– |
|
Rectangle
|
Thickness |
6 |
12 |
345 |
– |
170 |
10 |
– |
– |
| Width |
6 |
25 |
| Thickness |
6 |
12 |
310 |
– |
1115 |
15 |
– |
– |
| Width |
25 |
100 |
| Thickness |
12 |
50 |
310 |
– |
115 |
15 |
– |
– |
| Width |
25 |
50 |
| Thickness |
12 |
50 |
275 |
– |
105 |
20 |
– |
– |
| Width |
50 |
100 |
| PHYSICAL PROPERTIES |
| Melting Point (Liquidus) |
1670 °F (≈ 910 °C) |
| Machinability |
90% (Where C36000 free cutting brass is 100%) |
| Electrical Conductivity |
21.7% IACS at 20°C or 68 °F |
| Thermal Conductivity |
109W/m at at 20°C or 68 °F |
| FABRICATION PROPERTIES |
| Technique |
Suitability |
| Forgeability Rating |
Good |
| Cold working |
Fair |
| Hot working |
Fair |
| Soldering |
Good |
| Brazing |
Good |
| Welding |
Fair |
