Patent ID: 6267921
Filing Date: 2001-07-31
Classification: A61L,C21D,C22C,Y10S

Abstract:
A high specification non-magnetic stainless steel which is corrosion resistant in physiological media, and which can be produced at atmospheric pressure, characterized in that its composition in % by weight is as follows:Mn 15% to 24% Ti .ltoreq.0.020% Cr 15% to 20% Al .ltoreq.0.020% Mo 2.5% to 4% S .ltoreq.0.0020% N 0.6% to 0.85% B .ltoreq.0.020% V 0.1% to 0.5% Nb + Ta .ltoreq.0.5% C .ltoreq.0.06% Co .ltoreq.0.5% Ni .ltoreq.0.25% Cu .ltoreq.0.5% silica .ltoreq.0.25%and from 0 to 0.5% of each of elements Cu, Co and of the sum Nb+Ta, the remainder being constituted by iron and impurities, and in that its composition satisfies the following conditions:(%Cr)+2.5(%Mo).ltoreq.27 (I)(%Cr)+3.3(%Mo).gtoreq.26 (II);andLog(%N)+0.0605(%N)=-1.3+[125(%V)+80(%Nb)+52(%Cr)+19(%Mn)].times.10.sup.-3 -[4.3(%Cr).sup.2 +0.35(%Mn).sup.2 ].times.10.sup.-4 +0.17(%Cr).sup.3.times.10.sup.-5 (III).