Hardening and tempering method in the process of manufacturing drill stem connector
An oil drill pipe joint and manufacturing process technology, applied in drill pipes, manufacturing tools, drill pipes, etc., can solve problems such as multiple conditioning and tempering, and achieve the effect of saving energy, shortening conditioning time, and ensuring product performance
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the defects of the prior art, in order to solve the problem that multiple times of quenching and tempering are required in the manufacturing process of oil drill pipe joints, and to realize that the product performance requirements can be met after only one quenching and tempering, and to propose a new Conditioning method
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[0019] In the following, it will be explained by taking the quenching and tempering of 5" type oil drill pipe joint by adopting the method of the present invention as an example.
[0020] First of all, by using the national standard chemical detection method, the percentage content of the main alloy elements C, Si, Mn, P, Mo, Cr, Ni, Cu in the 5" drill pipe joint blank is detected, as follows:
[0021] C: 0.37% Si: 0.23% Mn: 0.96% P: 0.013%
[0022] Mo: 0.31% Cr: 1.11% Ni: 0.12% Cu: 0.014%
[0023] According to the national standard, in the 5″ drill pipe joint blank, the C element content is 0.35%-0.38%, the Si element content is 0.15%-0.35%, the Mn element content is 0.85%-1%, and the P element content is ≤0.013%; The Mo element content is 0.28% to 0.33%, the Cr element content is 0.9% to 1.2%, the Ni element content is ≤0.25%, and the Cu element content is ≤0.25%. It can be seen that the 8 main alloy elements in the drill pipe joint blank are all in the standard within ran...
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Abstract
The invention discloses a hardening and tempering method in the process of manufacturing a drill stem connector, which comprises the following steps of: detecting that whether content of main alloy elements in a drill stem connector blank meets the national standard, if so, adopting a carbon equivalent calculation method, converting the detected content value of each alloy element into respectively corresponding C equivalent value, and calculating the sum of the C equivalent values; determining a temperature range selected during quenching and a temperature range selected during tempering according to the calculated C equivalent sum; and performing hardening and tempering according to the determined temperature ranges to make the connector meet the performance index requirements through one-time hardening and tempering. The method can quickly and accurately determine hardening and tempering technological parameters, avoids the conventional mode of reworking for hardening and tempering for multiple times, greatly shortens the hardening and tempering time, saves energy and reduces production cost on the premise of ensuring product performance.
Description
technical field [0001] The invention belongs to the technical field of manufacturing oil drill pipe joints, and relates to a quenching and tempering method in the manufacturing process of oil drill pipe joints. Background technique [0002] Drill pipe is an important component in the exploration and development of oil and gas resources in the field of oil and natural gas. The drill pipe joint is used to connect the upper and lower drill pipes during oil drilling, and bears the working torque during use. Due to the harsh working conditions of oil drill pipe joints, they have high requirements on their own performance, their tensile strength Rm≥970MPa, yield strength Rp0.2≥862MPa, especially the average impact value that they must be able to withstand at -20°C Often as high as 71J or more. [0003] When manufacturing drill pipe joints, the quenching and tempering process before blank finishing is a key process, and it is also the core technology of oil drill pipe joints. If...
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IPC IPC(8): C21D9/14C21D1/18E21B17/02
Inventor 任丽萍陈桂玲温建生李照勇李辉郭为民李一平兰志强赵玉林石恒强赵斌杨健冯建明王红丽程丽霞常晋民刘文龙代海花刘铁李建华谭海兰席艳红李建功窦继魁