About SASAKI NAOHIKO
About HORII TANETADA
About 日本製鋼所
About FUJIWARA MIKIO
About SAITO HIDEYUKI
About MISAWA TOSHIHEI
About impact strength
About 玉鋼
About Forging techniques
About Mechanical properties
About 日本
About 靭性
About バランス
About 折返し
About 鍛錬
About 炭素量
About 焼入れ
About 硬さ