gray iron

noun

pig iron or cast iron having much of its carbon in the form of graphite and exhibiting a gray fracture.

Origin of gray iron

First recorded in 1655–65

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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

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