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一、前言长期以来控制钢中的含氮量是炼钢工作者的一项重要任务。时于低氮的新钢种,由于要求更严格,所以现在已加强了氮含量的控制。例如一种经连续退火炉退火的冷轧板要求含氮量为25～40ppm,又如一种用来轧制线材的超低碳钢的含氮量在50ppm以下。为了有效地控制这些钢种的氮含量,则要求对氮的来源有所了解,围绕营这个问题已展开了许多研究。当前炼钢生产方面的改进和新采用的下铸工艺都是从这个要求考虑的。
I. INTRODUCTION Controlling the nitrogen content of steel for a long time is an important task for steel-making workers. New steel grades at low nitrogen, due to more stringent requirements, have now stepped up their control of nitrogen levels. For example, a cold-rolled sheet annealed by a continuous annealing furnace requires a nitrogen content of 25 to 40 ppm, and in another example, an ultra-low carbon steel used for rolling a wire has a nitrogen content of 50 ppm or less. In order to effectively control the nitrogen content of these steels, an understanding of the source of nitrogen is required, and much has been done around the issue of camp. The current improvements in steel-making production and the newly-adopted under-casting process all take this requirement into account.