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P80R钢扁材(/%:0.15C,0.25Si,1.70Mn,0.012P,0.002S,3.01Ni,0.34Mo,1.07Cu,1.10A1)的生产流程为110tLD—LF—RH-4.2t铸锭-初轧开坯150mm×615mm扁材-轧成60mmX610mm扁材。经检验和分析得出,裂纹附近Ni,cu严重富集,其Ni含量和cu含量分别达32.55%~33.53%和7.97%-8.86%,Cu的富集导致表面晶界氧化,形成裂纹,应控制钢中cu含量、加热温度和时间。通过将钢中cu含量从1.07%降至0.