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研发的耐候钢$355J2w(/%:0.06~0.10C,0.20~0.40Si,1.00.1.30Mn,≤0.008S.≤0.020P.0.25~0.40Cu,0.30~0.55Cr,0.10~0.30Ni,0.020~0.040Nb,0.020~0.050Alt)的试生产流程为铁水-120t顶底复吹转炉-LF-250mm×2000mm板坯连铸_车L制≤16mm板。通过采取控制转炉终点[C]≤0.05%,[P]≤0.015%,精炼时(FeO)+(MnO)≤1.5%,(Si02)≤15%,精炼渣碱