The effect of Nb and Mo on the mechanical properties of 13%Cr-5%Ni martensitic stainless steel was studied to develop materials for an ultra-high-speed hydrofoil. A 13%Cr-5%Ni steel with the tensile strength of over 960 MPa and the toughness of over 100 J at -100 deg C can be obtained by satisfying the following two conditions. One is the addition of a small amount of Nb. The other is the adoption of tempering without normalization after hot rolling. An addition of 1 % Mo to the steel improves the fatigue strength in sea water, because Mo suppresses pitting corrosion. Based on these results, 5.5 - 205 mm thick plates with the chemical composition of 13 % Cr-5 % Ni-1 % Mo-0.06 % Nb were produced by the commercial production process. The developed steel showed good weldability in the use for producing hydrofoils. This steel has been successfully used as the foils and struts of ultra-high-speed hydrofoils.
Strengthening and toughening of 13%Cr-5%Ni martensitic stainless steel for welded structure and its application to foils and struts of an ultra-high-speed hydrofoil
Verfestigung und Entfestigung eines martensitischen nichtrostenden 13%Cr-5%Ni-Stahls für Schweißkonstruktionen und dessen Einsatz zur Herstellung der Tragflächen und Versteifungen von Ultrahochgeschwindigkeits-Tragflächenbooten
Titel japanisch
Kawasaki Steel Giho ; 30 , 3 ; 148-153
1998
6 Seiten, 15 Bilder, 4 Tabellen, 14 Quellen
Aufsatz (Zeitschrift)
Japanisch
martensitischer nichtrostender Stahl , Schweißkonstruktion , Baustahl , Schiff , Schiffbau , mechanische Eigenschaft , Verfestigung , Entfestigung , Mikrogefüge , Zugfestigkeit , Bruchzähigkeit , Niobzusatz , Normalglühen , Dauerfestigkeit , Meerumwelt , Molybdänzusatz , Schweißbarkeit , Tragflächenboot , Chrom-Nickel-Stahl
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