EAF+LF(VD)-ESR双联法生产30CrMnSiA电渣钢的工艺优化

Process Optimization Steel 30CrMnSiA Production by EAF+LF (VD)-ESR Combined Process

大冶特钢以传统工艺EAF＋LF-轧制250mm×250mm轧坯生产的30CrMnSiA合金钢1．2t电渣锭母材，钢锭上部易产生裂纹。经采用优化工艺EAF＋LF（VD）-Φ320mm铸棒生产ESR母材，并控制母材中（％）：≤0．003Pb、≤O．015Sn、≤0．030As、≤O．015（Pb＋Sn）及0．020～0．035Ti；供电与水温均用计算机控制。结果使ESR充填比由0．40提高至0．53，电渣电耗下降200kWh／t，母材至电渣锭的金属收得率由82．41％提高至93．75％，废品量由109．55kg／t降低到29．42kg／t，生产周期缩短7～10天。

Traditional process to produce electrode of alloy steel 30CrMnSiA 1.2 t ESR ingot at Daye Special Steel is EAF ＋ LF - rolling 250 mm x250 mm Billet, by which the crack easily produced at top of ESR ingot. With using optimum process to produced ESR electrode： EAF ＋ LF（VD） steelmakiug - Φ320 mm cast round electrode, controling ≤0. 003Pb, ≤0. 015Sn, ≤0. 030As, ≤0. 015（ Pb ＋ Sn） and 0. 020 ～ 0. 035Ti in electrode, power supplying and water temperature controlling by computer, the ESR filling ratio increased from 0. 40 to 0. 53, ESR electrical power consumption decreased by 200 kWh/t, metal yield of ESR ingot/electrode increased from 82. 41% to 93.75%, rejected metal decreased from 109. 55 kg/t to 29. 42 kg/t and production period shortened by 7 ～ 10 days.