Capped steels have characteristics similar to those of rimmed steels, but to a degree intermediate between those of rimmed and semi-killed steels. A deoxidizer may be added to affect a controlled rimming action when the ingot is cast. The gas entrapped during solidification is in excess of that needed to counteract normal shrinkage, resulting in a tendency for the steel to rise in the mold. The capping operation limits the time of gas evolution and prevents the formation of an excessive number of gas voids within the ingot. Capped steel is generally cast in bottle-top molds using a heavy metal cap.
Felux is ready to help you with your steel business.Join now