Al によるキルド鋼の粒度調整について

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To clarify the effect of aluminum upon the austenite grain size of plain carbon steel, the behaviors of its nitride, oxide and sulfide were investigated as follows : (1) Under the special conditions, such as in vacuum, or in nitrogen and oxidizing atmospheres, various amounts of aluminum or sulfur were added to a high carbon steel melted with a 35KVA induction furnace. (2) To high and low carbon steel, melted with a 250 kg test furnace, various amounts of aluminum were added in the ladle. Silicon was added in the furnace or in the ladle; or not at all. To some low carbon heats various amounts of sulfur were added in the ladle. (3) Amounts of aluminum were varied to some extent when they were added in the ladle to many heats of low-carbon fine-grain steel, melted with a 60ton basic open hearth and high carbon coarse grain steel, melted with a 100ton basic open hearth furnace. Austenite grain size of these steels was determined by the carburizing method. The relation between austenite grain size and various components of these steels, including nonmetallic inclusions, was studied. The main results were as follows : (1) AIN was the most dominant factor in retarding the growth of austenite grains by addition of aluminum. (2) Al_2O_3 reduced the effect of AIN in fine-grain steel. (3) In a coarse grain steel containing a little aluminum, oxides, such as Al_2O_3, or sulfides also retarded the growth of austenite grain to some extent. (4) Duplex grain was necessarily formed at the transition state of grain growth while it was also caused by segregation of Al_2O_3. (5) Furnace deoxidation (blocking) in the basic open hearth furnace would be valuable to attain to the stability of grain size control.
社団法人日本鉄鋼協会の論文
1954-11-25

Al によるキルド鋼の粒度調整について

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