N80Q钢级油管伸长率不稳定原因探讨  

Discussion on Causes for Unstable Elon gation Rate of N80Q Oil Tubing

作　　者：张友鹏 吴宇新[1] 李大航[1] 刘璇[1] 周洪庆[1] 朱义轩 赵刚[1] ZHANG Youpeng;WU Yuxin;LI Dahang;LIU Xuan;ZHOU Hongqing;ZHU Yixuan;ZHAO Gang(Anshan Iron&Steel Co.,Ltd.,Anshan 114009,China)

机构地区：[1]鞍钢股份有限公司,辽宁鞍山114009

出　　处：《钢管》2020年第4期36-38,共3页Steel Pipe

摘　　要：针对Ф73.02 mm×5.51 mm N80Q油管出现批量伸长率不稳定的情况,分析N80Q油管力学性能结果、显微组织及现场实际生产情况。分析结果表明,淬火不均匀导致钢管的纵向组织存在较大差异,从而带来回火后力学性能尤其是伸长率指标波动过大;在淬火时,外喷淋和内轴流要及时打开并且使钢管均匀冷却,尤其是要保证高温段冷却速度,得到理想的淬火马氏体组织,才能使回火后的伸长率等性能稳定。Addressing the problem that unstable elongation rate is found with batches of the Ф73.02 mm×5.51 mm N80Q oil tubing,analyses are conducted,involving the mechanical properties,the microstructure and the actual production status thereof.It is revealed via the analysis that it is the uneven quenching treatment that leads to obvious difference between the longitudinal structures of the pipe,which consequently causes the remarkable fluctuation of the after-temper mechanical properties of the pipe,particularly the elongation rate,Accordingly during the quenching process the outer spray and the inner axial flow must be open timely to get the pipe cooled evenly,and particularly the cooling rate of the high temperature section must be ensured so as to obtain ideal after-quench martensite structure which may bring about stable post-temper mechanical properties like the elongation rate etc.

关 键 词：油管 N80Q 伸长率 淬火 显微组织 

分 类 号：TG113[金属学及工艺—物理冶金] TE931.2[金属学及工艺—金属学]