Abstract：During the process of reducing the hot metal ratio at the 210 ton converter in Hunan Valin Lianyuan Iron and Steel Co Ltd，through adding compensation heating in the BOF，optimizing the oxygen lance position，decreasing the reblowing and overblowing, controlling the end carbon during 0.03%0.06% and control the end temperature no less than 1 580 ℃ to prevent the nitrogen content beyond the upper limit. Optimizing the bottom blow flow of the ladle during the tapping, and adopt nonskilled tapping. The 1 st current arcing time is more than 1 min during the first power transmission，the flow rate of the bottom blowing of the ladle is less than 320 L/min and the bottom blow flow of the ladle is optimized during the LF treatment. The hot metal water ratio is reduced to 72%, the w(［N］) in the steel after tapping is less than 0.003 5%, the w(［N］) pickup of the liquid steel is less than 0.002 0% during the LF treatment, and the proportion of the w(［N］) in tundish steel less than 0.006 0% increased from 83.9% to 99.8%, which meeting the nitrogen control requirements of the nitrogen control steel by using the above technologies.
刘彭，隋亚飞，徐刚军，邓之勋. 低铁水比下钢水中氮的控制[J]. 钢铁, 2019, 54(6): 121-126.
LIU Peng，SUI Yafei，XU Gangjun，DENG Zhixun. Control of nitrogen in steel under low hot metal ratio. Iron and Steel, 2019, 54(6): 121-126.
