急速可鍛鑄鐵と其應用

概要

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Quick malleable cast irons, containing 12-25% of silicon, w re investigated. In irons of a high silicon content, the time required for the first stage of graphitization is very short. Generally it was less than one hour. The limit of carbon and silicon contents, in which cast iron can be converted perfectly white, was investigated at several cooling rates. Test pieces for the mechanical tests were taken from centrifugally cast cylinders, which were cast in a metal mould and annealed for the first stage of graphitization. The lower the cabon and silicon con ents are, the higher the tensile strength of quick malleable cast iron. A strength of 60kg/mm^2 was obtained. The impact resistance of quick malleable cast iron depends on the silicon content and the structure of the temper carbon. Irons of a low silicon content show the better impact resistance. Rings of quick malleable cast iron were tested for compression. Some of them can yeild to 1/3 of the original ring diameter before they break. The author suggests the application of quick malleable cast iron to centrifugally cast iron pipes.
社団法人日本鉄鋼協会の論文
1939-07-25