WordNet
n. steel with a surface that is much harder than the interior metal
Usage examples of "case-hardened steel".
The hull rang as the first hypervelocity missile struck the case-hardened steel of the bridge.
But the case-hardened steel would turn any ordinary sword, spear or arrow, and weighed no more than a second layer of wood.
Grim was the only word to describe it, the set of his jaw like case-hardened steel.
The case-hardened steel rang out against the chipped wooden stock of the Kentucky musket.
The walls were brownstone-the hardest building material other than granite or marble to tunnel or blast through-and the windows were blocked with bars that looked like old iron but that Stephen knew were really case-hardened steel and would be wired with motion or decibel sensors or both.
The frangible bullets in their Sigs would be no use against the door's case-hardened steel panels.