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对鞍钢采用氧气顶吹转炉(BOF)冶炼、非调质工艺开发的N80级油井管用钢进行了系统的工艺设计、实验室研究、工业实验及工业生产研究.提出了V、N微合金化取代常规淬火和回火工艺,设计了非调质N80的化学成分,确定了符合鞍钢氧气转炉大规模生产非调质N80的冶炼工艺以及各工序的工艺控制要点,特别是确定了实际工况下氧气转炉终点碳、氧、温度的回归公式以及VD底吹增氮动力学模型等关键工艺要点.连续生产的实测数据分析结果表明:非调质N80冶炼工艺稳定可行,化学成分、冶炼工艺设计合理,力学性能和使用性能均满足API Spec 5CT及油井管生产的特殊要求.
The system design, lab research, industrial experiment and industrial production of N80 grade oil well tubular steel developed by BOF smelting and non-quenched and tempered process were carried out for Ansteel Co. The V, N microalloying substitution Conventional quenching and tempering process, the chemical composition of the non-quenched and tempered N80 was designed, and the smelting process accorded with the large-scale production of the non-tempered N80 in the oxygen steel rotary furnace of Angang and the process control points of each process were confirmed. In particular, The regression equation of the carbon, oxygen and temperature at the end of the converter, and the kinetic model of nitrogen blowing at the bottom of the VD plant, etc. The analysis of the measured data of the continuous production shows that the non-quenched and tempered N80 smelting process is stable and feasible, the chemical composition and smelting process are reasonable, The mechanical properties and serviceability meet the special requirements of API Spec 5CT and oil well pipe production.