capped steel

capped steel

[′kapt ′stēl]
(metallurgy)
Partially deoxidized steel cast in an open-top mold, which is capped to solidify the top metal and enforce internal pressure, resulting in a surface condition similar to that of rimming steel.
References in periodicals archive ?
The throttle lock is a short length of capped steel pipe that fits over a push-pull type throttle and is secured with an Abus security padlock.