X60鋼級(jí)管線用無(wú)縫鋼管的研制

Development of Seamless Steel Line pipe in X60 Grade

摘要: 從鋼種成分、工藝路線、工業(yè)性試驗(yàn)等方面論述了X60（PSL1）鋼級(jí)管線用無(wú)縫鋼管生產(chǎn)中存在的問(wèn)題,分析了產(chǎn)生的原因,認(rèn)為MnNb鋼在1050℃以上的溫度時(shí),其奧氏體晶粒將出現(xiàn)明顯的混晶及粗化現(xiàn)象,將對(duì)鋼管的綜合力學(xué)性能,尤其是沖擊韌性有不利的影響。將AR軋管機(jī)終軋溫度控制在1050℃以下是提高該鋼種沖擊韌性的有效途徑。也是用非調(diào)質(zhì)工藝生產(chǎn)X60（PSL1）鋼級(jí)管線用無(wú)縫鋼管的關(guān)鍵措施。

Abstract: Relevant problems concerning the production of the X60（PSL1）seamless steel linepipe are discussed in terms of chemical composition,manufacturing process flow and pilot commercial production,and the causes therefore are analyzed.It is identified that at the temperature above 1 050℃,the austenitic gains of the MnNb steel are subjected to significant mixing and coarsening,thus producing negative influence on the comprehensive mechanical properties of the tube,particularly the impact toughness.It is an effective approach to keep the final rolling temperature of the Accu-roll Pipe Mill less than 1 050℃to improve the steel’s impact toughness,which is also a critical step of the non-quench-temper manufacturing process to produce X60（PSL1）seamless steel linepipe.