The Collaborative International Dictionary of English v.0.48:
Crucible steel \Cru"ci*ble steel\ Cast steel made by fusing in crucibles crude or scrap steel, wrought iron, and other ingredients and fluxes. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
crucible steel n 1: steel made by the mixture of molten wrought iron, charcoal, and other substances in a crucible