| Chemical
composition |
|
Grade
A |
Grade
B |
| Tin |
|
5.5
to 8.0% |
4 to
6 % |
| Lead |
|
1.0
to 3.0% |
4 to
6% |
| Zinc |
|
3.0
to 6.0% |
4 to
6% |
| Total
of all elements other than those set out above
and excluding Copper and incidental Nickel |
|
0.50% |
0.50% |
| Copper
plus incidental Nickel |
|
Balance |
Balance |
| |
Physical Properties |
|
|
| |
Ultimate
tensile strength |
22kg/mm²
(14.5 tons/sq.in.) |
20.5kg./m
(13 tons/sq.in.) |
Sand
cast
(cast
on) |
Elongation
percent minimum
on standard
test piece C |
8% |
15% |
| |
Ultimate
tensile strength |
23 kg./mm²
(14.5 tons/sq.in.) |
20.5kg/mm²
(13 tons/sq.in.) |
Sand
cast
(separately cast) |
Elongation percent minimum
on standard
test piece C
|
12% |
15% |
