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Nominal composition:
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| Zinc |
(Zn) |
34% |
| Manganese |
(Mn) |
2.5% |
| Lead |
(Pb) |
2.2% |
| Silicon |
(Si) |
1% |
| Copper |
(Cu) |
60% |
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Description
These are wrought zinc-manganese-silicon-lead-copper
alloys which are widely specified for a
variety of bearing and/or corrosive applications:
bushings, gears, cams, nuts and bolts, connector
rods, idler shafts and other shafting, worm gears,
feed fingers, lead nut screws, etc.
Both alloys have excellent capacity for hot
forming, with hot forgeability ratings of 100.
AMPCO® 674 exhibits a machinability rating of
25%, while AMPCO® 673 has a considerably
higher rating of 80%.
This significant difference in the two materials is
in the higher lead content of AMPCO® 673 which
increases that alloy's machinability but decreases
its tensile and
yield values.
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