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俄罗斯下塔吉尔钢铁公司选择4种不同固态渣料分别加入到转炉出钢前钢包底、出钢后钢包表面、LF精炼时钢包钢水表面和中间包钢水表面;经过LF+RH精炼、钢水钙处理,“软吹氩”操作和宽板坯连铸,所生产的X70和X80管线钢化学成分达到碳含量不大于0.08%、硫含量不大于0.005%、磷含量不大于0.018%、钛和氮含量比为2.5～4.0;板坯表面没有发现偏析、角裂和星裂,点状不均匀性缺陷为0级,疏松不大于1.5级,偏析不大于1.0级,裂纹不大于0.5级;力学性能抗拉强度达到640MPa以上。总体上,所生产的X70和X80管线钢板坯达到了API5L标准要求。
Russia’s Nizhny Tagil Iron and Steel Company selected four different solid residues were added to the ladle before the tapping of the converter tapping, ladle after ladle surface, LF ladle molten steel surface and tundish surface; LF + RH refining, The chemical composition of X70 and X80 pipeline steel produced by this project has a carbon content of not more than 0.08%, a sulfur content of not more than 0.005% and a phosphorus content of not more than 0.018% , And the content of titanium and nitrogen is 2.5-4.0. No segregation, cleft and star split are found on the surface of the slab. The spot nonuniformity defect is grade 0, porosity is not greater than 1.5, segregation is not greater than 1.0, and the crack is not greater than 0.5 Level; Tensile strength of mechanical properties up to 640MPa. Overall, the X70 and X80 pipeline steel slabs produced met API5L standards.