COMPOSITION AND PROPERTIES
| ASTM DESIGNATION (Commercial) |
Z30A (858) |
ZS331A (879) |
ZS144A (878) |
| Composition (1) | |||
| Copper, per cent |
57.0 min. |
63.0 to 67.0 |
80 to 83 |
| Silicon, per cent |
0.25 max. |
0.75 to 1.25 |
3.75 to 4.25 |
| Lead, max., per cent |
1.50 |
0.25 |
0.15 |
| Tin, max., per cent |
1.50 |
0.255 |
0.25 |
| Manganese, max., per cent |
0.25 |
0.15 |
0.15 |
| Aluminum, max., per cent |
0.25 |
0.15 |
0.15 |
| Iron, max., per cent |
0.50 |
0.15 |
0.15 |
| Magnesium, max., per cent |
— |
— |
0.01 |
| Other elements, max., per cent |
0.50 |
0.50 |
0.25 |
| Zinc, per cent |
30.0 min. |
Remainder |
Remainder |
| PROPERTIES AND CONSTANTS (2) | |||
| Tensile Strength, (ksi) |
55 |
70 |
85 |
| Tensile Yield Strength 0.2% offset (ksi) |
30 |
35 |
50 |
| Elongation, (% in 2 in.) |
15 |
25 |
25 |
| Impact Strength, Charpy. (ft. lb.) |
40 |
50 |
70 |
| Hardness, (HRB) |
55-60 |
68-72 |
85-90 |
| Modulus of Elasticity (x 106 psi) |
15 |
15 |
20 |
(1) Composition in percent as indicated. Same as ASTM B176.
(2) Data from NADCA — average typical properties for separately die cast test bars.