摘要
通过对深海管线服役工况的分析，总结了深海用管线钢的技术特点，表明高强度、大壁厚、小径厚比管线钢管是深海用管线钢管的发展趋向。通过采用低C高Mn， Nb和Ti微合金化的成分设计和TMCP工艺控制，开发出了深水用X70钢级、厚壁36.5 mm管线钢，其全壁厚组织以均匀细小的针状铁素体＋少量M/A岛为主。对钢板进行了实物力学性能测试，测试结果显示：屈服强度480～550 MPa，屈强比≤0.82，-20℃下冲击功410 J以上，横向和纵向DWTT断口纤维率为100%，该深海管线用X70厚壁管线钢达到高强度、低屈强比、高韧性和优良低温抗动态撕裂能力的良好匹配。
Through analysis of deep-sea pipeline service conditions,it summarized the technical characteristics of deep-sea pipeline steel,and showed that high strength, heavy wall thickness and small diameter-thickness ratio are the development trend for deep-sea pipeline steel pipe. By using high Mn,low C and Nb,Ti micro-alloying composition design,and TMCP process,the X70 pipeline steel with 36.5 mm thickness used in deep-sea pipeline was developed. The main microstructure of full thickness consists of uniform fine acicular ferrite and a small number of M/A island. The yield strength of steel plate arrives 480~550 MPa,the yield ratio≤0.82,the impact energy over 410 J at -20 ℃,the fiber fracture rate is 100% of horizontal and vertical DWTT, which achieves good matching with high strength,low yield ratio,high toughness and excellent dynamic tear resistance at low temperature.
出处
《焊管》
2014年第10期5-10,共6页
Welded Pipe and Tube
基金
国家高技术研究发展计划(863计划)课题:深海高压油气输运高强厚壁管材关键技术研究(2013AA09A219)
关键词
深海管线用钢
X70钢
大壁厚
热机械控制工艺(TMCP)
微观组织
力学性能
pipeline steel for deep water X70 steel heavy wall thickness thermo mechanical control process （TMCP） microstructure mechanical properties
