采用OHTP工艺生产西气东输二线用22mm厚X80钢板

22 mm Thickness of X80 Plates Production for the Second West-to-East Natural Gas Transmission Pipeline by Using OHTP

针对西气东输二线项目用厚规格X80钢板技术要求和沙钢炼钢、轧钢技术装备条件,采用低碳、高铌的HTP成分和OHTP(Optimized High Temperature Processing)控轧控冷工艺,进行了22 mm厚X80钢板批量生产和JCOE直缝焊管制管试验。结果表明,OHTP X80钢板无论力学性能、-15℃落锤性能,还是JCOE制管后管体屈强比均比HTP钢有明显改善。OHTP X80钢板-80℃下夏比冲击吸收能仍处于上平台,CVN值大于270 J,50%FATT低于-100℃,-30℃下DWTT落锤试验断口剪切面积的比例大于90%,85%DWTT为-34℃。

According to the technical requirements of X80 heavy thickness plates for the second west-to-east natural gas transmission pipeline project and the capability of steelmaking and plate mill of Shagang,a HTP chemical design of low carbon and high niobium was adopted and the OHTP of control rolling and cooling for plates was developed.A mass production of 22 mm thickness of X80 plate and manufacturing of LSAW JCOE pipes of 22 mm×1 219 mm were carried out.The results show that the mechanical properties,DWTT properties at-15 ℃ of plates and the yield/tensile ratio of the pipes were significantly improved by comparing that of HTP X80 plates.The absorb energy of Charpy V-notch impact test at-80 ℃ remains at its top platform above 270 J,the 50% FATT is below-100 ℃.At-30 ℃,the DWTT fracture shear area is 90%,and 85% DWTT value is at-34 ℃.