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Home > Archive>Volume 51, Issue 3, 2024 >125-130. DOI:10.12143/j.ztgc.2024.03.016
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Research on zone heat treatment technology of straight-connected wire-line core drill pipe
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1.Jinshi Drill Tech Co., Ltd., Tangshan Hebei 063000, China;2.College of Construction Engineering, Jilin University, Changchun Jilin 130026, China;3.Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Natural Resources (Jilin University), Changchun Jilin 130026, China)

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P634

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    Abstract:

    In order to improve the performance of the wire-line core drill pipe， the stress， structural characteristics and traditional treatment technology of the straight-connected wire-line core drill pipe were analyzed， and a zonal heat treatment process was proposed. Through the heat treatment of both ends， the heat treatment performance of the middle pipe body area and the thread area at both ends was different， and the comprehensive strength of both ends was improved while the stress state of the thread part was improved. It can make the drill pipe string have both high strength and flexibility， and greatly improve the mechanical properties and wear resistance of the drill pipe. The quenching and tempering hardness HRC33~38 can increase the strength by 37.7%， the hardness by 40% and the impact resistance by 46.7% under the condition that the elongation of the pipe body is basically the same as that of normalizing and tempering. When the quenching and tempering hardness is HRC38~42， the wear resistance of the material is increased by 9.1%. It is more suitable for full hydraulic drilling rig construction and deep hole drilling， and provides the optimal scheme for drilling rig and drill pipe matching.

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History
  • Received:December 17,2023
  • Revised:April 01,2024
  • Adopted:April 02,2024
  • Online: May 30,2024
  • Published: May 10,2024
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