炭素鋼の結晶粒に就て

概要

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The test pieces were taken from 20 sheets of high carbon steels with about the same chemical composition which were made in both the acid and the basic open hearth furnace. The test results are as follow : - In the normalized condition, two kinds of the tests pieces have shown about the same results with respect to the tensile test, but in the Charpy's shock test, it has been proved that the basic steel is inferior, and also that the amount of shock value depends on the coarseness and finess of austenite grains. Further examination has been made with Mc Quaid-Ehn test which is used for determinings the grain size, and it has been ascertained that the grain size determined by this method indicates the inherent nature of steel, and has also been Experimentaly clarified that the steels having the same grain size show about the same physical properties independent to the kind of the steel refining furnaces used. Finally, the result of the test with reference to the change of austenitic grain size in the process of refining, discloses that the controll of grain is necessary for the improvement of the quality of steel.
社団法人日本鉄鋼協会の論文
1939-12-25