pig iron or cast iron having much of its carbon in the form of graphite and exhibiting a gray fracture.
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How to use gray iron in a sentence
Mild steel is a good test, and a light gray iron is admirable for practice lessons.Practical Mechanics for Boys | J. S. Zerbe
In this case, as well as in Figs. 32 and 33, both the field and the armature are made of soft gray iron.Electricity for Boys | J. S. Zerbe
At one point, not far from Cle-ellum River, a bed of gray iron ore crosses the magnetic ore at right angles.A Report on Washington Territory | William Henry Ruffner
An average of over 400 tons of iron is poured daily, and 426 tons of gray iron have been poured in a single day.The Wonder Book of Knowledge | Various
The pistons as provided in the A-7 engines are cast from a mixture of steel and gray iron.Aviation Engines | Victor Wilfred Pag