Cu-Sn STEEL IN WHICH Cu-Sn COEXIST AND METHOD FOR MANUFACTURING SAME

摘要

A main object of the present invention is to provide a method for producing a Cu-Sn coexisting steel in which good surface quality is maintained even when hot rolling is performed. The present invention relates to a copper alloy having a composition of 0.04 to 0.20% of C, 0.05 to 1.00% of Si, 0.20 to 2.50% of Mn, 0.05% or less of P, 0.02% or less of S, Sn coexisting steel containing 0.06 to 0.50% of Al, 0.06 to 1.00% of Al, and 0.05 to 1.00% of Ni, and the remainder being Fe and impurities are continuously cast, (Al) / (3 [Si] + [Mn]) 0.050, [Ni] / ([Cu] +5 [Sn]) 0.050, ) 0.10, and [Al] / [Ni] 0.20, oxidizing the surface of the cast steel in the cooling process of the cast steel to form an internal oxide layer,₂O₃/RTI ;