生产非调质N80级石油套管的新工艺可行性实验研究

Feasibility Experimental Study of New Process of Producting Non-quenching and Tempering N80 Grad Oil Casings

对国内生产非调质N80级石油套管的现状做了简述,在包钢φ180mm机组上取轧卡样,用Gleeble-1500热模拟试验机测定34Mn2VN钢的动态CCT曲线并进行控冷实验。借助光镜和扫描电镜对显微组织和断口进行分析。通过实验研究,提出了一种新的生产非调质N80级石油套管的工艺,在包钢进行大批量生产试验。结果表明,选用合理的终轧温度和冷速,采用加热→穿孔→连轧→脱管→定减径→冷却,可实现大批量生产。该工艺与传统生产工艺相比有减少工序、提高生产率、节约能源的优点。

The present status of producing non-quenching and tempering N80 grad oil casings were described. The CCT curves of 34Mn2VN steel were measured and cooresponding controlled cooling tests were conducted by means of the Gleeble-1500 thermal simulator. Microstructures and fracture shapes were analyzed with L.M and SEM. Through experimental study, a new process of producing non-quenching and tempering NS0 grad oil casings that has been tested on the φ180 mills of Baotou Iron＆Steel （group） Co.Ltd was presented. The results indicate that mass production can be realized with suitable finishing temperature and cooling rate by using the following production process：heat→perforation→MPM→extracting mill→tube sizing and reducing→cooling. It has advantages of higher productivity,less procedures and energy consumption compared with the traditional one.