Patent ID: 6123784
Filing Date: 2000-09-26
Classification: C22C,Y10T

Abstract:
An austenitic stainless steel comprising iron and the following elements by weight based on total weight:5.times.10.sup.-3 %.ltoreq.carbon.ltoreq.200.times.10.sup.-3 %5.times.10.sup.-3 %.ltoreq.nitrogen.ltoreq.400.times.10.sup.-3 %0.2%.ltoreq.manganese.ltoreq.10%12%.ltoreq.chromium.ltoreq.23%0.1%.ltoreq.nickel.ltoreq.17%0.1%.ltoreq.silicon.ltoreq.2%,wherein the weight of the following residual elements are controlled such that:0%.ltoreq.sulfur.ltoreq.100.times.10.sup.-4 %40.times.10.sup.-4 %.ltoreq.total oxygen.ltoreq.120.times.10.sup.-4 %0%<aluminum.ltoreq.5.times.10.sup.-4 %0%.ltoreq.magnesium.ltoreq.0.5.times.10.sup.-4 %0%<calcium.ltoreq.5.times.10.sup.-4 %0%.ltoreq.titanium.ltoreq.4.times.10.sup.-4 %and wherein oxide inclusions present comprise, in the form of a glassy mixture, the following oxides in proportions by weight based on total weight of glassy mixture:40%.ltoreq.SiO.sub.2 .ltoreq.60%5%.ltoreq.MnO.ltoreq.50%1%.ltoreq.CaO.ltoreq.30%0%.ltoreq.MgO.ltoreq.4%5%.ltoreq.Al.sub.2 O.sub.3 .ltoreq.25%0%.ltoreq.Cr.sub.2 O.sub.3 .ltoreq.4%0%.ltoreq.TiO.sub.2 .ltoreq.4%,the oxides of which the inclusions are composed satisfying the following relationship:% Cr.sub.2 O.sub.3 +% TiO.sub.2 +% MgO<10%.