MANUFACTURE OF HOT-ROLLED FERRITE STAINLESS STEEL STRIP USED FOR OBTAINING COLD-ROLLED SHEET HAVING EXCELLENT FORMABILITY AND SURFACE PROPERTY

摘要

PURPOSE:To obtain the titled hot-rolled steel strip used for obtaning a cold- rolled sheet having excellent formability and surface property by adding a small amt. of Nb, heating ferrite stainless steel slab with increased content of Al, breaking down at a specified draft percentage, soaking at a specified temp., and then finish-rolling. CONSTITUTION:A ferrite stainless steel slab contg. 10-20%, by weight, Cr, 0.01-2X(C+N)% Nb, and 0.05-0.3% Al is heated at a specified temp. The hot slab is broken down at =50% cumulative draft percentage, soaked at 900- 1,150 deg.C within one hour, and successivey finish-rolled. The steel is annealed, and pickled. Since the cold-rolled annealed sheet obtained from said hot-rolled steel strip has excellent formability and surface property, the sheet can be used for various kinds of domestic appliances, automobile parts, etc.