非金屬介在物に依る鋼品位判定方法(學振 19 小委第 5 號)

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Up to the present, various methods for the estimation of slag inclusions in steel have been proposed from which some presumptions on the quality of steel would be deduced. Among the many, only an official method was dited by Jernkontoret, Sweden in 1936. The 19th Sectional Committee of the Japan Society for the Promotion of Scientific Research has endeavoured since the beginning of 1937 to establish the most adequate method to designate the results of the prescribed microscopic examination of slag inclusions in steel and to contribute to the appreciation of steel quality. Some parts of our recommended method resemble to that of Jernkontoret's, but the characteristic features are as follows- a) Types of slag included are classified into two classes, namely A and B, where A (sulphides, silicates) designates those of easily elongated by some plastic deformation of the steel containing, and in the same case, B (oxides) being left untouched. b) Relative quantity of slag inclusions in steel either in segregated or dispersed distribution has to be estimated under the microscope of magnification at 100 diameters and expressed as a numerical figure (which called Inclusion Number) comparing to the strictly prepared Inclusion Chart. c) Inclusion Chart is composed of 40 photomicrographs of 80mm in diameter, some 20 of them (10 figures every two types of inclusion) indicate the Inclusion Number 1 to 5 arranged in the order as a=2^<N-1> where a designates the relative quantity of slag inclusions and N Inclusion Number. The other 20 figures are shown as a standard to measure the mean thickness of inclusions in 3, 6, 9, 12 and 15μ of Inclusion Number 3 as the examples. d) Mean specific content of inclusions obtained by the following calculation is named Index Number of Cleanness and adopted as a basis of the appreciation of steel qualities together with the mean thickness of the inclusions examined. Σ(a.F)/ΣF=Index Number of Cleanness. where F designates the number of fields so examined having the same inclusion number and ΣF the total sum of the fields actually examined. e) Counting of numbers of inclusions under the microscope and also measurements of their sizes are not decidedly done. Our recommended method is the outcome of about two years' jealous investigation cooperated with many specialists in Japan, and the present author certainly convinces that this method will make an enormous contribution to the study of steel-making and of further treatments of steel.
社団法人日本鉄鋼協会の論文
1940-05-25

著者

俵國一
東大

非金屬介在物に依る鋼品位判定方法(學振 19 小委第 5 號)

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