ゼンマイ材料の熱處理に關する二,三の問題
1951 年 37 巻 8 号 p. 457-460
詳細
1951 年 37 巻 8 号 p. 457-460
(1) The oxidation of steel strips for watch-springs by heating in air are severe upwards 800°C, therefore overheating over 850°C shall be unallowed.
(2) The steel strips heated already are attacked more severely than of virgin state.
(3) The decarburisation of steel strips are affected by higher temperature than blow-in of air into heating furnace.
(4) Sample #A plate shows the germination of grains at 900-950°C.
(5) The best oil quench temperature of samples #M and #A are decided as 800-850°C.
(6) The use of salt bath in low temperature below 500°C will be dangerous by attacking of nitrate salts.
