A grayish shade of the color blue, like the metal steel

Having or resembling this shade of blue

(slang, idiomatic) Courage, audacity.

plural of steel guitar

Steel made directly from cast iron by burning out a portion of the carbon and other impurities that the latter contains, through the agency of a blast of air which is forced through the molten metal.

plural of Bessemer steel

A high-strength, but low-carbon, workable steel alloy with 15-25% nickel and lesser amounts of cobalt and other materials, that achieves it strength by a martensitic structure achieved by heat treatment and aging.

Damascus steel

plural of Damask steel

plural of Damascus steel