| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.14 ( March 1986 ) Special Issue on Stainless Steels ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| 13Cr-3.5Ni Martensitic Stainless Steel Castings for Hydraulic Turbine Runners Hiromasa Niinaka, Akira Hirose, Satoru Sogabe, Hiroshi Noguchi |
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Synopsis : A 13Cr-3.5Ni martensite stainless steel is used for the hydraulic turbine runner, because it is suitable for high strength, high corrosion resistant and high abrasion resistant materials. These material properties are affected sensitively by heat treatment of normarizing and tempering. In manufacturing the hydraulic turbine runner, Kawasaki Steel established quality control in the manufacturing process, using the following technical improvements: (1) design of casting plans with solidification simulation using CAD, (2) control of the volume of gases that are generated from the core, (3) control of core drying, (4) control of the pouring process by sealing with the argon gas, (5) control of the knockout temperature, (6) control of heat treatment, (7) control of repair welding. It has now become possible to manufacture satisfactory products of the three types of runners: Francis, Kaplan, and Pelton runners. |
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