| 摘要 |
PURPOSE:To manufacture a member made of two-phase stainless steel excellent in corrosion resistance, toughness, corrosion fatigue resistance, and strength by subjecting a member made of stainless steel with a specific composition to solution heat treatment and then to tempering treatment under specific temp. conditions. CONSTITUTION:A cast member of stainless steel having a composition consisting of, by weight, <0.08% C, 0.2-2% Si, 0.2-2% Mn, 23-26% Cr, 6-8% Ni, 1-5% Mo, 0.2-1% Cu, 0.2-4% Co, 0.05-0.25% N, and the balance Fe is heated up to 1,050-1,150 deg.C and water-cooled to undergo solution heat treatment. Subsequently, this member is heated to 500-600 deg.C an held at this temp. for a proper length of time and then air-cooled to undergo tempering treatment, by which the member made of stainless steel having a two-phase structure of ferrite and austenite and excellent in strength and corrosion fatigue resistance as well as in corrosion resistance can be obtained. |
