Manufacturing method for producing drill stem joint form seamless steel tube

A manufacturing method and technology for seamless steel pipes, which are applied in manufacturing tools, metal rolling, furnaces, etc., can solve the problems of low performance stability, serious environmental pollution, low finishing efficiency, etc., and achieve uniform and stable mechanical properties. The effect of high overall efficiency and improved production efficiency

Active Publication Date: 2019-12-06
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of serious environmental pollution, long delivery period, low performance stability and low finishing efficiency in the prior art manufacturing method. How to make rod joints

Method used

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  • Manufacturing method for producing drill stem joint form seamless steel tube
  • Manufacturing method for producing drill stem joint form seamless steel tube
  • Manufacturing method for producing drill stem joint form seamless steel tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Using electric furnace smelting, refining outside the furnace and vacuum degassing, it is continuously cast into a continuous casting round tube billet with a diameter of 155 mm. The chemical composition is shown in Table 1. It is then heated in a ring-shaped heating furnace at 1240 ° C. After heating for 4 hours, it is released from the furnace. Piercing is carried out on a conical piercer with a feed angle of 12°, a rolling angle of 15°, and a reduction of 12%, and then the pipe is rolled by an ASSEL pipe rolling machine with a feed angle of 8° and a rolling angle of 6 °, the diameter reduction is 15mm, the wall reduction is 4.8mm, and then the reduction and sizing is carried out on the twelve-stand sizing machine. The deformation of the sizing machine is 11.5%, and the specification of the hot-rolled seamless steel pipe is 108 *31mm (outer diameter*wall thickness), treated according to the quenching and tempering method of this embodiment, the specific quenching and t...

Embodiment 2

[0085] The continuous casting round tube billet with a diameter of 155 mm is used. The chemical composition of the steel grade is specifically shown in Table 4. The process of smelting, heating and rolling the seamless steel pipe is shown in Example 1. The specification of the hot-rolled seamless steel pipe is 116*35mm (outer diameter* wall thickness), using a heat treatment system of 840°C quenching heating and 590°C tempering heating, and processing according to the quenching and tempering method of this embodiment. The specific quenching and tempering process is shown in Table 5. The comparison of the mechanical properties of steel pipes produced in Example 1) is shown in Table 6, wherein the tensile test is tested according to ASTM A370, the impact test is tested according to ASTM E23, and the hardness is tested according to ASTM E18.

[0086] Table 4 Chemical composition of seamless steel pipes (mass fraction%, the balance is Fe and unavoidable impurities)

[0087] ...

Embodiment 3

[0094] The continuous casting round billet with a diameter of 155 mm is used. The chemical composition of the steel grade is shown in Table 7. The process of smelting, heating and rolling the seamless steel pipe is shown in Example 1. The specification of the hot-rolled seamless steel pipe is 116*35mm (outer diameter* wall thickness), using the heat treatment system of quenching heating at 850°C and tempering heating at 598°C, and processing according to the quenching and tempering method of this embodiment. The specific quenching and tempering process is shown in Table 8. The comparison of the mechanical properties of steel pipes produced in Example 1) is shown in Table 9, wherein the tensile test is tested according to ASTM A370, the impact test is tested according to ASTM E23, and the hardness is tested according to ASTM E18.

[0095]Table 7 Chemical composition of seamless steel tube steel (mass fraction%, the balance is Fe and unavoidable impurities)

[0096] C ...

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Abstract

The invention provides a manufacturing method for producing a drill stem joint from a seamless steel tube. The manufacturing method comprises the following steps: preparing continuously cast circulartube blank through processes of smelting, external refining, vacuum degassing and casting in sequence; performing heating treatment on the prepared continuously cast circular tube blank; performing hole-piercing, tube-rolling and reducing and sizing treatment on the tube blank obtained by heating treatment, and cooling the tube blank to the room temperature, thereby obtaining a seamless steel tube; performing tempering treatment on the stainless steel tube; performing ultrasonic flaw detection on the tempered seamless steel tube on automatic flaw detecting lines, and ensuring that the surfaceand internal quality of the stainless steel tube is free of defects; unloading the qualified seamless steel tube subjected to ultrasonic flaw detection, turning and processing to define the finished product drill stem joint. The manufactured drill stem is uniform and stable in integral structure and mechanical property. The manufactured drill stem joint has section hardness fluctuation within 3HRC(25HBW), and can control strength fluctuation within 70 Mpa.

Description

technical field [0001] The invention relates to the technical field of manufacturing seamless steel pipes, in particular to a manufacturing method for producing drill pipe joints using seamless steel pipes. Background technique [0002] During drilling operations, drill pipes are connected through drill pipe joints to form a drill string. The conventional manufacturing method of drill pipe joints is: rolling round billet→cutting material→heating→die forging→quenching and tempering→finishing→flaw detection. [0003] At present, the existing conventional methods for manufacturing drill pipe joints have the following technical defects and deficiencies: 1) In order to ensure the product quality after die forging, lubrication should be ensured during the hot die forging process, and the addition of lubricants will cause environmental pollution and endanger working environment, endangering the working environment of workers. 2) The working efficiency of die forging is low. Genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/04B21B19/10B23P15/00C21D9/08
CPCB21B19/04B21B19/10B23P15/00C21D9/08C21D9/085
Inventor 万五霞潘先明黎福华马亮江南崧
Owner DAYE SPECIAL STEEL CO LTD
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