white iron is metal
Production method is different. Cold rolling method and different.
I know foreverhoroscopes.com, ifate.com has a bunch of widgets in their widget section. That might help.
Cast iron is used as the "material of choice" for many machinery housings or bases because it is extremely stable in its structure. Certainly it is subject to thermal expansion and contraction, but the crystal structure of cast iron makes it "hold its shape" in applications ranging from machines and machine parts to cookware. And in things like a lathe bed, we need the thing to be "the same" every day and all the time so we get accurate, consistent work. Cast iron also suppresses high frequencies generated during machining. Note that the ways (the parts of the bed that the carriage slides on), are hardened and machined to provide lasting and accurate surfaces.
based on the microstructure of gray cast iron, the graphite form flakes, which is tiny flakes that tend to weaken the matrix structure in tension. it tend to fail in diagonal shear.
it is Pre-cast i do not know why but it is like that.
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see black tempering and white tempering of white cast iron.
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