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    厚壁AISI 1340鉆鋌管體料熱處理性能不合格原因分析

    Analysis of Reasons for Nonconformance of Heat Treatment Performance of AISI 1340 Heavy Wall Drill Collar Pipe Body

    • 摘要: 某鉆鋌加工廠熱處理厚壁鉆鋌時出現(xiàn)批量的沖擊功或屈服強度不合格現(xiàn)象，綜合分析該鉆鋌的化學成分、機械性能、金相組織、硬度等的波動原因，認為：水淬冷卻速度過慢和周向不均勻是導致該管體強度波動較大和沖擊性能不高的主要原因。結合生產實際情況，通過研究鉆鋌的熱處理工藝設備和工藝方法，建議通過適當提高材料中的Mn、Cr 含量提高材料的淬透性，并且增大冷卻速度，定期檢查淬火池水溫的變化和噴嘴狀態(tài)將有利于穩(wěn)定產品的性能。

       

      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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