600 MPa级管线钢DWTT落锤撕裂试验  

DWTT DROP WEIGHT TEAR TEST OF 600 MPa GRADE PIPELINE STEEL

作　　者：张通 杨小波 赵启扬 刘洋 肖锋 许可 Zhang Tong;Yang Xiaobo;Zhao Qiyang;Liu Yang;Xiao Feng;Xu Ke(HBIS Group Tangsteel Company,Tangshan 063000,Hebei)

机构地区：[1]河钢集团唐钢公司,河北唐山063000

出　　处：《河北冶金》2024年第1期32-37,共6页Hebei Metallurgy

摘　　要：管线钢是当前重要的能源用钢,其材料的韧性是油气管道安全运行的重要技术指标之一。针对某钢厂600 MPa级管线钢生产初期落锤撕裂试验结果不合的原因进行了研究,通过调查试验钢的生产工艺,对比不同层冷温度下的落锤撕裂试验结果,进一步分析落锤试样撕裂断口位置的金相组织、夹杂物、带状组织与带钢层冷温度的关系。结果认为,600 MPa级管线钢DWTT落锤撕裂试验不合是由于落锤试验样品取样位置的带钢层冷温度偏高,导致该区域显微组织析出了大量碳化物,使得带钢韧性降低、脆性提高。层冷温度在200~400℃,显微组织稳定,碳化物析出明显降低,试验钢种钢材的韧性性能和落锤撕裂性能稳定,能够满足产品要求;层冷温度在400℃以上,随着层冷温度的提升,钢材的韧性性能和落锤撕裂逐步降低。Pipeline steel is an important energy steel,and the toughness of its material is one of the important technical indicators for the safe operation of oil and gas pipelines.In view of the inconsistency of the drop weight tear test results in the early stage of 600 MPa pipeline steel production in a steel mill,the relationship between the metallographic structure,inclusions,and ribbon structure at the tear fracture position of the drop weight specimen and the cold temperature of the strip steel layer was further analyzed by investigating the production process of the test steel and comparing the drop weight tear test results at different layers of cold temperature.The results showed that the DWTT drop weight tear test of 600 MPa grade pipeline steel was inconsistent because the cold temperature of the strip layer at the sampling location of the drop weight test sample was high,resulting in a large amount of carbides precipitated in the microstructure of the area,which reduced the toughness and increased the brittleness of the strip.The layer cooling temperature is 200~400℃,the microstructure is stable,the carbide precipitation is significantly reduced,the toughness performance and drop weight tear performance of the test steel are stable,which can meet the product requirements,and the layer cooling temperature is above 400℃,with the increase of the layer cooling temperature,the toughness performance of the steel and the drop weight tear are gradually reduced.

关 键 词：管线钢 DWTT落锤撕裂试验 韧性 层冷温度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]