Analysis of Reasons for Nonconformance of Heat Treatment Performance of AISI 1340 Heavy Wall Drill Collar Pipe Body
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摘要: 某钻铤加工厂热处理厚壁钻铤时出现批量的冲击功或屈服强度不合格现象，综合分析该钻铤的化学成分、机械性能、金相组织、硬度等的波动原因，认为：水淬冷却速度过慢和周向不均匀是导致该管体强度波动较大和冲击性能不高的主要原因。结合生产实际情况，通过研究钻铤的热处理工艺设备和工艺方法，建议通过适当提高材料中的Mn、Cr 含量提高材料的淬透性，并且增大冷却速度，定期检查淬火池水温的变化和喷嘴状态将有利于稳定产品的性能。Abstract: Addressing the fact that nonconformance of impact energy and yield strength are found with heavy wall drill collar pipe bodies in batch as being heat treated by a certain domestic drill collar processing factory,analyses concerning the chemical composition,mechanical property,metallographic structure and hardness of the pipes are conducted.As a result,it is identified that both the rather slow water-cooling speed as uesd and circumferential water cooling inhomogeneity as occurred during the water quenching process lead to the obvious strength fluctuation and low impact energy of the pipe. Accordingly based on the production practice,it is proposed to take such actions as increasing Mn and Cr contents in the steel to improve the hardenability,enhancing the water cooling speed,and periodically checking the quench tank water temperature and the spray nozzle status so as to further stabilize the product performance.
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Keywords:
- oil drill collar /
- water quenching /
- martensite /
- hardenability diameter
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