STUDY ON THE HIGH SPEED STEEL (3rd Beport)

Abstract

18-4-1 standard high speed stee's, which are generally used, contain as much as 18 % tungsten. Owing to the scarcity of production of tungsten in Nippon, it is essential to decrease the content of tungsten or to add small amount of other elements, instead of large amount of tungsten in high speed steels. Following the first and second report (Tetu to Hagane, Vol.23, 1937, No.8, p. 787-798 & Vol. 27, 1941, No. 6, p. 373-404) the present paper dealt mainly with the following standard type and substitute materia's of high speed steels:-
(1) 18-4-1 series (standard type).
(2) 14-4-1 series.
(3) 12-4-1 series.
(4) 8-4-1; 8-4-3; 8-4-5 series
(5) 4-4-1 series.
(6) 2-4-1 series.
(7) 0-4-1; 0-4-4 series.
(8) 0-8-1; 0-18-4 series.
(9) 0-12-1; 0-12-4 series.
Moreover the author dealt with the comparative study of acid and basic high speed steels by hardness test at normal and high temp ratures, microscopic examination and cutting test, etc.