酒钢120t转炉-LF-CC工艺生产L360管线钢的实践

Practice of L360 Pipeline Steel Production by 120t Converter-LF-CC Process at Jiuquan Steel

通过铁水脱硫-120t转炉冶炼-LF精炼（吹氩、喂线）-160（220）mm板坯连铸-2架炉卷轧机。轧制生产了1．6—12．7mm管线钢IJ360带材（％：0．08—0．12C、0．10—0．25Si、1．10—1．30Mn、≤0．015P、≤0．008S、0．03—0．05Nb）。采用高拉碳补吹法控制转炉终点[C]0．04％；LF精炼时用A1MnFe、MnFe和NbFe合金化。并喂Al线和SiCaBa线；连铸采用全程氩封注流保护浇铸等工艺措施。生产统计结果表明。L360管线钢[O]为（10-15）×10^-6，[N]（14—35）×10^-6。[H]（1．2—1．6）×10^-6。∑[N＋H＋O]≤51．6×10^-6；该钢的屈服强度为425-460MPa，抗拉强度505—525MPa。屈强比0．81—0．88，均达到标准要求。

The 1.6 - 12. 7 nun strip of L360 pipeline steel （0. 08 - 0. 12C, 0. 10 - 0. 255i, 1.10 - 1.30Mn, 0. 015P, ≤0. 0085, 0. 03 -0. 05Nb） was produced by hot metal desulphurization - 120 t converter melting - LF refining （ argon stirring, feeding wire） - 160 （220） mm slab concasting - 2-stand Steekel mill flow sheet. The production data statistic results showed that with using the measures such as catch carbon and reblow practice to control converter end [ C ] 0.04%, AlMnFe, MnFe and NbFe alloying and feeding Al wire and SiCaBa wire in LF refining, argon shielded casting in whole slab casting, the [ O] of L360 pipeline steel was （10-15） ×10^-6, [ N] （14-35） ×10^-6,[ H] （1.2 ～ 1.6） ×10^-6 and ∑[ N ＋ H ＋ O] ≤ 51.6 ×10^-6; yield strength （YS） of the steel was 425 -460 gPa, ultimate tensile strength （UTS） 505 -525 MPa, and ratio of YS-UTS 0.81 -0. 88, all up to standard.