无Mo、Cu、Ni元素X65MOS海底抗酸管线钢的开发  

Development of Mo, Cu, Ni free X65MOS submarine acid resistant pipeline steel

作　　者：宋志岗[1] 史显波[2] 侯明山[1] 高小尧 于程福 SONG Zhigang;SHI Xianbo;HOU Mingshan;GAO Xiaoyao;YU Chengfu(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063016,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063016 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《轧钢》2024年第6期6-11,共6页Steel Rolling

基　　金：海洋装备用金属材料及其应用国家重点实验室开放基金资助项目(SKLMEA-K202205)。

摘　　要：针对X65M海底抗酸管线钢生产成本较高的问题,在不添加Mo、Cu、Ni元素的化学成分基础上,利用合理的TMCP工艺设计,开发了满足海底抗酸管线钢力学性能、时效冲击性能、CTOD性能、抗HIC及SSCC性能要求的低成本X65MOS热轧带钢。生产实践表明:在低温轧制条件下,增大末机架压下率至13%,利用超快冷和加密层冷工艺,细化了X65MOS带钢针状铁素体晶粒,晶粒度达到12级,显著提高了带钢力学性能;落锤实验结果显示X65MOS带钢-40℃温度下剪切撕裂面积达到100%,-60℃温度下时效冲击功达到300 J以上,CTOD值为+∞;在相同HIC和SSCC实验条件下,X65M带钢出现较多裂纹,而X65MOS带钢均未出现裂纹。X65MOS带钢组织中的大量位错保证了其在无Mo、Cu、Ni元素条件下的CTOD性能、抗HIC及SSCC性能。所开发的低成本X65MOS带钢各项性能均显著优于X65M带钢,对提升产品竞争力、提高经济效益具有重要的现实意义。In response to the high cost of X65M submarine acid resistant pipeline steel,a low-cost X65MOS hot-rolled strip that meets the mechanical properties,aging impact property,CTOD performance,HIC and SSCC resistance performance requirements of submarine acid resistant pipelines was developed using a reasonable TMCP process design without adding Mo,Cu,Ni elements in the chemical composition.Production practice has proven that under low-temperature rolling conditions,increasing the reduction rate of the final stand to 13%,and using ultra fast cooling and dense laminar cooling processes,the needle like ferrite grains of X65MOS strip were refined to a grain size of grade 12,significantly improving its mechanical properties.The results of the drop hammer experiment showed that the shear tear area of X65MOS strip reached 100%at-40℃,and the aging impact energy reached over 300 J at-60℃,with a CTOD value of+∞.Under the same HIC and SSCC test conditions,when there were many cracks in the X65M strip,there were no cracks in the X65MOS strip.The large number of dislocations in the microstructure of the X65MOS strip ensured its CTOD performance,HICand SSCC resistance performance in the absence of Mo,Cu,and Ni elements.The low-cost X65MOS strip developed has significantly better performance than X65M strip,which has important practical significance for enhancing product competitiveness and improving economic benefits.

关 键 词：X65MOS海底抗酸管线钢 低成本 化学成分设计 控轧控冷工艺 工艺时效冲击性能 CTOD性能 耐腐蚀性能 

分 类 号：TG3[金属学及工艺—金属压力加工]