Grey iron can be melt in low temperature around ', and melted grey iron has very good liquid property, it means that grey iron casting can be designed as thin thickness 4.0mm only, but ductile iron will be difficult for 4mm thickness wall.
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Grey iron is the cheapest material in all metal grade. It's widely used in many usual application, such as Fence, solid pipe, lathe bed and others.
Grey/Gray Iron tensile strength normally ranges from 20,000 to 60,000 lb/in2 and is a function of chemistry, graphite morphology, and matrix microstructure. And yield strength or elongation is not normally required in Standard.
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The most important property is that grey iron is very stable, it's a good property for lathe bed and press machine body, and it also widely used as guide rail for lathe.
Grey iron also have good corrosion resistance property, it's suitable for sewer system which don't have pressure, such as EN877 soil pipe, gully grating.
This has been discussed here on H-M several times but admittedly might be hard to find in a search. While you might get lucky and find something not too bad, most of those items are not cast with machinability in mind. The best stuff is Dura Bar, or grey iron or I think called CL 40. Non grey iron can be so hard as to be a challenge to carbide. Also those junk iron things can have voids and not be very pure. Depending on your project this might not be a problem but if you are wanting to make something machine grade you'd be better off finding a piece of an old junked machine to work with. I got a nice piece of Dura Bar off eBay. The machinability especially compared to some of the Chinese cast iron I've machined is night and day. Nice finish that doesn't kill my carbide with no voids.
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