PRODUCTION METHOD OF FERRITE SYSTEM STAINLESS STEEL PLATE WITH NO ROLLING SURFACE DEFECT AND WITH EXCELLENT RIDGINGNESS, AND WIRE FOR B ADDING

摘要

PROBLEM TO BE SOLVED: To obtain a stainless steel plate without rolling surface defects and with excellent ridging property by inserting a B adding wire, wherein the material including B is wrapped with a coating material, in a center unsolified portion in a mold being continuous cast, fusion solvent it, and adding a specific volume of B to the center part of a cast piece. ;SOLUTION: A mother steel is composed of, at weight percentage, 0.08% or less C, 0.05-1.0% Si, 0.05-1.0% Mn, 0.001-0.2% acid soluble aluminum, 0.06% or less N, 10-23% Cr and Fe which substantially constitutes the residue. The mother molten steel is cast continuously, and the B adding wire is inserted in the unsolified part of the mother molten steel located in the center of the mold, and is melted and is dissolved, and 30-300 ppm of B is added. The position where B is added is set to be a central part which is deeper than the position which 10-35% of total thickness from the surface of the cast piece. An outer cover 1 of the B adding wire is the austenitic stainless steel, of which the melting point is lower than that of the mother molten steel, and a core 2 of the central part is a mixture of one kind or more of B containing alloy, ferro boron, Fe carbonic boron, and Cr carbonic boron.;COPYRIGHT: (C)1999,JPO