低温管线钢DWTT性能影响因素研究  

Research on Influence Factors of DWTT Properties of Low-temperature Pipeline Steel

作　　者：孙磊磊[1] 屈献永[1] 郑磊[1] SUN Leilei;QU Xianyong;ZHENG Lei(Research and Development Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《焊管》2020年第5期1-7,共7页Welded Pipe and Tube

摘　　要：DWTT性能是超低温服役管线钢管产品开发的关键技术难点之一。在实验室冶炼、轧制条件下,设计了5种不同成分的管线钢,分析研究了化学成分、卷取温度、冷却速度等因素对管线钢热轧板卷低温DWTT性能的影响。结果表明,w(C)=0.042%试验钢的DWTT性能显著优于w(C)=0.065%试验钢;添加Ni元素可有效提高试验钢的DWTT性能,并且添加Mo+Ni对珠光体的抑制作用优于添加Cr+Ni元素,可获得更好的DWTT性能;卷取温度从530℃降低至450℃,可有效细化显微组织,提高DWTT性能,效果比添加Ni元素明显;冷却速度从18℃/s提高到28℃/s,亦可有效提高DWTT性能。基于研究结果,成功试制了Φ508 mm×11.13 mm规格的X56钢级低温服役HFW管线钢管,并表现出了优异、稳定的-45℃DWTT性能。DWTT performance is one of the key technical difficulties in the development of the ultra low-temperature pipeline steel products.Under the conditions of the smelting and rolling in the laboratory,five different compositions of pipeline steel with different compositions were designed.The effects of the chemical composition,coiling temperature and cooling speed on the low-temperature DWTT performance of pipeline steel hot rolled coil were studied.The results show that the DWTT performance of w(C)=0.042%test steel is significantly better than that of w(C)=0.065%test steel.The addition of Ni element can effectively improve the DWTT performance of the test steel,and the inhibition effect of Mo+Ni on pearlite is better than that of Cr+Ni element,which can obtain better DWTT performance.When the coiling temperature is reduced from 530℃to 450℃,the microstructure can be refined effectively and the DWTT performance can be improved,which is more effective than adding Ni element.The cooling rate is increased from 18℃/s to 28℃/s,which can also effectively improve the DWTT performance.Based on the research results,the X56 steel grade HFW pipeline steel pipe with the specification ofΦ508 mm×11.13 mm in low-temperature service has been successfully trial manufactured,and has shown excellent and stable performance of-45℃DWTT.

关 键 词：管线钢 低温韧性 DWTT性能 

分 类 号：TG456.3[金属学及工艺—焊接]