HIGH-MN NONMAGNETIC REINFORCING STEEL BAR AND ITS PRODUCTION

摘要

PURPOSE:To produce the steel bar having satisfactory magnetic permeability required of nonmagnetic steel, causing no deterioration in toughness, and having high yield strength without causing hot cracks by treating a slab of a steel free from the addition of alloying elements, such as Ni and Cr, and containing Mn, etc., in a specific blending ratio under the prescribed processing conditions. CONSTITUTION:A slab of a steel having a composition consisting of, by weight, 0.55-0.80% C, =0.5% Si, 11-17% Mn, 0.02-0.06% Al, 0.02-0.06% N, =0.02% P, and the balance iron with inevitable impurities is prepared. The steel bar is produced by heating the above steel slab up to 1050-1250 deg.C, performing finish rolling at =20% rolling reduction, and regulating the final rolling temp. to 710-980 deg.C.