Typical Shrinkage Allowances for Important Casting Metals

 

Sr.No. Metal Contraction
(per cent)
Contraction
(mm per metre)

1
Grey cast iron
0.7 to 1.05 7 to 10.5
2
White cast iron
2.1 21
3
Malleable iron
1.5 15
4
Steel
2.0 20
5
Brass
1.4 14
6
Alluminium
1.8 18
7
Aluminium alloys
1.3 to 1.6 13 to 16
8
Bronze
1.05 to 2.1 10.5 to 21
9
Magnesium
1.8 18
10
Zinc
2.5 24
11
Manganese steel
2.6 26.5