X80M直缝埋弧焊管用热轧钢板开发

Development of X80M hot-rolled steel plate for LSAW pipe

为了满足中俄东线450×10^(8) m^(3)/a超大输量及-40℃极寒地区服役的国家重大管道工程建设用钢要求,结合南钢自身设备特点,试验开发了具有高强韧性的Φ1 422 mm×32.1 mm直缝埋弧焊管用热轧钢板。通过冶金热力学温度控制及保护浇铸手段,得到了成分波动范围窄、低倍组织评级C0.5级的高洁净度铸坯,试验确定了TMCP轧制工艺,钢板力学性能检测富裕量充裕,少量先共析铁素体+针状铁素体+贝氏体+马奥岛的软/硬相复合组织,满足了X80M钢板高强韧性要求,强韧性指标符合管道技术规范要求,实现了中俄东线低温超大输量管道用钢的批量工业生产。

In order to meet the requirements for annual transportation of 45 billion cubic meters of the China-Russian Eastern Line and the demand for construction of major national pipelines in extremely cold regions at-40 ℃, NISCO has tested and developed Φ1 422 mm×32.1 mm straight seam submerged arc welded pipeline steel plates which have high strength and toughness. The high cleanliness casting slabs with narrow composition fluctuation range and low organization rating C0.5 were obtained by metallurgical thermodynamic temperature control and protective casting methods. The industrial test verified the TMCP rolling process. The microstructure is composed of small amount of eutectoid ferrite+acicular ferrite+bainite+M/A island soft/hard phase, which meets the high strength and toughness requirements of X80 M steel plate. The strength and toughness performance indicators meet the requirements of pipeline technical specifications and meet mass industrial production of steel for low-temperature and large-volume pipelines.