GRAY IRON	DUCTILE IRON	LOW CARBON STEEL CASTING	LOW ALLOY STEEL CASTING
1	Shape stability	Excellent	Average	Bad	Average
2	Creep, (%/hr at 8000F, 25 Ksi)	Excellent .001-.01	Average .02-.20	Bad / Average .05-.5	Good .005-.05
3	Resistance to swelling	Bad	Good	Good / Very good	Very good