BOF-LF-RH-CC流程高压锅炉管用钢12Cr1MoVG的生产实践

φ110 ～ φ280 mm锅炉管用热轧圆钢12Cr1MoVG(/％:0.08 ～0.15C、0.17 ～0.35Si、0.40 ～0.70Mn、≤0.015P、≤0.010S、0.90 ～ 1.20Cr、0.25 ～0.35Mo、0.15 ～0.30V、≤0.015Alt])的生产工艺流程为120 t顶底复吹转炉-LF-RH-CC-轧制.通过控制铁水As]、Sn]、Sb]、Pb]、Bi],控制转炉终点C]0.04％ ～0.08％、P]≤0.010％、S]≤0.010％,出钢过程铝铁脱氧,钢包喂铝线控制Alt]≤0.015％并用复合精炼渣和少量铝丸终脱氧,控制中间包钢水过热度20 ～35℃,全程保护浇注等工艺措施,使试验钢的As]+Sn]+Sb]+Pb]+Bi]≤0.029％、P]≤0.011％、S]≤0.008％、Alt]≤0.011％,各类夹杂物级别均≤1.0,满足用户的技术要求.

Production Practice of Steel 12Cr1MoVG for High Pressure Boiler Tube by BOF-LF-RH-CC Process

The production flow sheet ofΦ110～Φ280 mm hot rolled round steel 12Cr1MoVG for boiler tube(/%:0.08～0.15C,0.17～0.35Si,0.40～0.70Mn,≤0.015P,≤0.010S,0.90～1.200,0.25～0.35Mo,0.15～0.30V,≤0.015Alt]) is 120 t top and bottom combined blown converter-LF-RH-CC-Rolling process.With the process measuresincluding to control hot metalAs],Sn],Sb],Pb]andBi],control converter end pointC]0.04%～0.080%,P]≤0.010%andS]≤0.010%,deoxidize by aluminum iron during tapping,feed Al wire in ladle to controlAlt]≤0.015%,refine by compound refining slag and some aluminum shot in LF process,control tundish liquid superheating extent20～35℃,whole-shielding-cast etc,theAs]+Sn]+Sb]+Pb]+Bi]is≤0.029%,theP],S]andAls]are respectively≤0.011%,≤0.008%and≤0.010%,and the rating of each series inclusion is≤1.0 to meetthe technical requirement of user.