Abstract: The1.6～12.7 mm strip of L360 pipeline steel(0.08～0. 12C,0.10～0.25Si,1.10～1.30Mn,≤ 0.015P,≤0.008S,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 Steckel mill flow sheet.The production data sta- tistic 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  Σ [N+H+0]≤51.6×10^-6;yield strength(YS)of the steel was 425～460 MPa,ultimate tensile strength (UTS)505~525 MPa,and ratio of YS-UTS 0.81～0.88,all up to standard.

Key words: Converter-LF-CC Flow Sheet, L360 Pipe Line Steel, Niobium Microalloying

摘要： 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L360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AlMnFe、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[0]为(10~15)×10^-6, [N](14~35)×10^-6,[H](1.2~1.6)×10^-6, Σ [N+H+0]≤51.6×10^-6;该钢的屈服强度为425～460 MPa,抗拉 强度505～525 MPa,屈强比0.81～0.88,均达到标准要求。

关键词: 转炉-LF-CC流程,  , L360管线钢, 铌微合金化