Oce Steel 無滲碳體鋼
    Octagon Steel Bar 八角鋼條
    Octagonal Bar Steel 八角型鋼
    Octagonal Steel 八角鋼
    Oil-Hardened Steel 油淬硬化鋼
    Oil-Hardening Steel 油淬鋼
    Oil-Operated Steel Support 液壓金屬支架
    Oil-Quenching Steel 油淬火鋼
    Open Forging Steel 商用鍛鋼坯
    Open Steel 沸騰鋼
    Open Steel Flooring 漏空鋼板樓面; 露鋼梁樓板
    Open-Hearth Steel 平爐鋼; 馬丁鋼
    Open-Heated Steel 過熱鋼
    Ordinary Steel 普通碳鋼
    Oriented Steel 各向異性鋼片
    Over-Reduced Steel 過還原鋼
    Overblown Steel 過吹鋼
    Oxidation Resistant Steel 抗氧化鋼; 不銹鋼
    Oxygen Blown Steel 吹氧鋼
    Oxygen Converter Steel 頂吹氧轉(zhuǎn)爐鋼
    Oxygen Furnace Steel 吹氧煉鋼
    Oxygen Jet Steel 吹氧煉鋼法
    Oxygen Steel 吹氧鋼
    Oxygen-Steel Process 氧化煉鋼法; 氧氣煉鋼法