About ASADA KAKU
About 仙台高専
About KUMAGAI SUSUMU
About 仙台高専
About WATANABE YOICHI
About パーカー熱処理工業
About automotive steel
About carbon containing alloy
About chromium additive alloy
About aluminum additive alloy
About vanadium additive alloy
About molybdenum additive alloy
About manganese additive alloy
About silicon additive alloy
About iron base alloy
About surface heat treatment
About gas nitriding
About Ammonia
About alloying element
About metal structure (microstructure)
About crystal structure
About phase constitution
About nitrided layer
About indentation hardness
About hardness
About nitride
About Vickers hardness
About modification
About organization
About microstructure
About hardness distribution
About Heat treatment technology
About Structural hardening phenomena
About 鋼
About ガス窒化
About 化合物層
About 組織
About 合金元素