Patent
Stainless cast steel for hydraulic turbine runner
Koji Sato,Sumi Yoshida +1 more
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TLDR
In this article, the authors proposed a stainless steel for a high lift hydraulic turbine runner having a specified amt. of retained austenite and δ-ferrite, and exhibiting superior strength and toughness.Abstract:
PURPOSE: To provide a stainless steel for a high lift hydraulic turbine runner having a specified compsn. of C, Si, Mn, Cr, Ni, Mo, V, etc., contg. a specified amt. of retained austenite and δ-ferrite, and exhibiting superior strength and toughness. CONSTITUTION: The stainless steel consists of, by wt., C 0.01W0.15%, Si 0.1W1%, Mn 0.1W2%, Cr 10W15%, Ni 2W7%, Mo 0.1W3%, V 0.05W0.5% and the balance Fe. To this compsn. may further be added 0.005W0.5% of one or more out of Nb, Zr and Hf. This steel has a mixed structure mainly composed of martensite and retained austenite, and it contains 10W40% of retained austenite and 10% or less of δ-ferrite. This steel is excellent in strength, toughness, corrosion fatigue strength and weldability, and it is suitable for use as a material for a high lift hydraulic turbine runner requiring a strength of about 100kg/mm 2 . COPYRIGHT: (C)1980,JPO&Japioread more
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