Use and Care Guide

9
Gray Iron Physical Properties
Tensile Strength 20,000 p.s.i. — 60,000 p.s.i.
(21,000 p.s.i.)
Elastic Modulus 10 - 23 x 10
6
p.s.i.
(Young’s modulus)
Hardness (Brinell) 150 - 250 BHN
Thermal Conductivity 0.110 - 0.137
calories/cm
2
/Sec/cm/ °C
Thermal Expansion 10 x 10
-6
/ °C
6 x 10
-6
/ °F
Density 0.25 - 0.28 lb./in
3
6.95 - 7.35 gm/cm
3
Specific Heat 0.13 BTU / lb / °F
0.13 cal / gm / °C
Composition of Gray Iron
The following are typical ranges of elements present
in unalloyed gray cast iron normally produced in
commercial practice:
Carbon (C) 2.60 - 3.85%
Silicon (Si) 1.25 - 2.90%
Manganese (Mn) 0.40 - 1.00%
Phosphorus (P) 0.02 - 0.90%
Sulfur (S) 0.04 - 0.20%
GENERAL INFORMATION