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通过80kg真空感应炉试验及Gleeble3800热模拟试验机测试了连续冷却相转变(CCT)曲线,设计了S2钢的化学成分(/%:0.63~0.69C,1.00—1.20Si,0.40~0.60Mn,0.20~0.40Cr,0.40~0.50Mo,0.15~0.25V,0.10~0.30Ni,0.010~0.030Nb,≤0.015P,≤0.010S),并进行120tBOF-LF.VD-300mm×390mm方坯连铸-开坯-高线轧制一斯太尔摩控冷流程的工业性生产。通过铁水脱硫,铁水硫含量≤0.01