GRAY IRON	DUCTILE IRON	LOW CARBON STEEL CASTING	LOW ALLOY STEEL CASTING
1	Basic thermal resistance parameter (Eα/k)	24	67	55	89
2	Sheer thermal resistance parameter   [U / (Eα/k)]	9	7	9	7
3	Estimated thermal stress 12000F	Good	Average	Avergae / Good	Average / Good
4	Thermal shock	Bad / Average	Average	Good	Good
5	Thermal constraints Mechanical endurance at 1200°F	Bad / Average	Average	Good	Good / very good
6	High temperature resistance (Ksi)	4	6	9	14/30