METHOD FOR HOT CHARGE OF CAST BILLET

摘要

PURPOSE:To perform a color check in short time and to decide the appropriateness of a hot charge by collecting a small piece sample from a specific part of continuous cast billet according to the kind of a steel and performing the surface inspection of this sample. CONSTITUTION:In order to shorten the time in deciding the appropriateness on a cast billet a small piece sample of the specific part is cooled by collecting it according to the kind of a steel and a color check is performed on this sample to perform the decision of the appropriateness of the hot charge. The generating place of a surface crack can be estimated according to the kind of steel and for instance owing to a crack being easy to cause on a dast billet corner part as shown in the figure in a boron steel a test piece is made by cutting about 100mm length in the longitudinal direction. The decision on the appropriateness of the hot charge is thus enabled in about 2.5hr by reducing the heat capacity by making it in small piece while it takes 7-8hr until the completion of a color check with the conventional method.