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    CB80高強(qiáng)度耐低溫管線管熱處理工藝研究

    Study on Heat Treatment Process of CB80 High Strength Low Temperature Linepipe

    • 摘要: 以淬火硬度、金相組織和晶粒度為評(píng)價(jià)尺度，確定CB80管線管的最佳熱處理制度；利用透射電鏡及EDS，對(duì)CB80管線管第二相粒子的形貌及成分進(jìn)行分析。分析認(rèn)為：淬火溫度為1 020℃，回火溫度在560～580℃時(shí)，CB80管線管的性能滿足API Spec 5L—2012標(biāo)準(zhǔn)對(duì)X80QO鋼級(jí)的要求，且具備較高的低溫沖擊性能；Nb、V、Ti在1 020℃時(shí)能充分溶解于奧氏體中，并在回火過(guò)程中析出，從而起到強(qiáng)化作用，提升鋼管性能；調(diào)質(zhì)態(tài)下的CB80管線管中析出物主要為NbC和少量的TiN；CB80調(diào)質(zhì)樣管的微觀組織主要由回火馬氏體板條以及析出物構(gòu)成，回火后馬氏體中的碳化物較少，位錯(cuò)密度不高。

       

      Abstract: The optimum heat treatment procedure for a CB80 linepipe is determined by evaluating its quenching hardness,microstructure and grain size.The analysis shows that when the quenching temperature is 1 020℃ and the tempering temperature ranges in 560~580℃,the performance of a CB80 linepipe will meet the requirements of API Spec 5L-2012 for X80QO steel grade,and it will have pretty good low-temperature impact properties.Nb,V and Ti can fully dissolve in austenites at 1 020℃ and precipitate during tempering,which will strengthen and improve the performance of a pipe.The precipitates in a quenched and tempered CB80 linepine are mainly NbC and a small amount of TiN.The microstructure of a quenched and tempered CB80 sample is mainly composed by tempered lath martensites and precipitates.After tempering,the martensite will show fewer carbides and less dislocation density.

       

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