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    • 6. 发明授权
    • 용접열영향부 충격인성이 우수한 인장강도 60Kg/mm²급 고장력강의 제조방법
    • 拉伸强度60KG / MM2高强度钢的制造方法,具有极好的冲击韧性
    • KR100256329B1
    • 2000-05-15
    • KR1019950068495
    • 1995-12-30
    • 주식회사 포스코재단법인 포항산업과학연구원
    • 방국수정홍철한재광
    • C21D8/00
    • PURPOSE: A method is provided to manufacture a high tensile steel having 60 kgf/mm2 level of tensile strength and superior impact toughness on heat affected zone of welding even when a high heat input welding method is applied by appropriately carrying out the thermal mechanical controlled processing while properly controlling C, Ti and O2 during the manufacturing of steel products using Ti oxides so that most of austenite grains are transformed into acicular ferrite. CONSTITUTION: In a method for manufacturing a Ti deoxidized high tensile steel of 60 kgf/mm2 comprising 0.2 to 0.5 wt.% of C and Si, 1.0 to 1.8 wt.% of Mn, 0.04 wt.% or less of P and 0.04 wt.% or less of S, the method for manufacturing a high tensile steel having 60 kgf/mm2 level comprises the processes of final rolling the steel at a temperature of 900 to 950 deg.C so that the steel contains 0.04 to 0.08 wt.% of C and 3 times of oxygen contents in the Ti steel; and tempering the quenched steel in an ordinary method after directly quenching the finally rolled steel in a cooling rate of 10 to 30 deg.C/sec.
    • 目的:提供一种方法,即使在通过适当地进行热机械控制处理的情况下施加高热输入焊接方法时,也可以制造具有60kgf / mm2的拉伸强度水平和优异的冲击韧性的高强度钢, 同时在使用Ti氧化物制造钢产品期间适当控制C,Ti和O2,使大部分奥氏体晶粒转变为针状铁素体。 构成:在60kgf / mm 2的Ti脱氧高强度钢的制造方法中,含有0.2〜0.5重量%的C和Si,1.0〜1.8重量%的Mn,0.04重量%以下的P和0.04重量% 在S以下的%以下的情况下,制造具有60kgf / mm2级的高强度钢的方法包括在900〜950℃的温度下最终轧制钢的方法,使钢含有0.04〜0.08重量% 的C和3倍氧含量在Ti钢中; 并以10-30℃/秒的冷却速度直接淬火最终轧制钢,以常规方法回火淬火钢。