Stainless steel pieces for application of drug hot before rolling and hot rolling method of stainless steel pieces

摘要

PROBLEM TO BE SOLVED: To prevent a stainless steel surface from a rough surface generated at the time of hot rolling by applying Ca compound or/and a Ba compound and an agent which adheres the compound to the stainless steel surface. ;SOLUTION: This stainless steel contains 10 mass% or more Cr. After the steel s heated, a hot rolling is carried out. In this case, a Cr₂O₃ layer, which is an oxide resistance protection film to be formed on the surface of the stainless steel, is melted by applying an agent, in which such a binder as a silic acid, a borosicicate and the like are added, and by heating. On the steel surface layer face before it is hot rolled, a de-Cr layer is formed in advance, which is lowered Cr in strength and has an appropriate thickness to contribute for a scale formation. Then, a layer 1 where an agent, an oxide flux and Fe-Cr system are oxidized, a Fe-Cr oxide 2, a de-Cr layer 3 of the metal surface layer, and a metal inner layer (an inner layer where Cr strength is not lowered) 4 are formed.;COPYRIGHT: (C)1999,JPO