参考資料 - Mekatoro
Gray iron castings Spheroidal graphite iron castings Blackheart malleable iron castings 鋼材の種類 Specifcations 標 準 Standard 焼入れ・焼戻し Quenching & Tempering Yield point Tensile strength Yield point Tensile strength Type 種 類 N/mm2 N/mm2 N/mm2 N/mm2 鉄鋼材料強度表（鋳鍛造品）Material strength table Normalizing
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