A kind of hot rolling processing method of titanium and titanium alloy seamless oil pipe

The technology of a seamless oil pipe and a processing method is applied in the field of hot rolling processing of titanium and titanium alloy seamless oil pipes, which can solve the problems of increased processing cost, fast consumption of tools and molds, and insufficient power of titanium alloys.

Active Publication Date: 2017-06-20
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] The production cycle of the above-mentioned process is long, but it is still not enough for the titanium alloy with a strength of 900MPa, the pipe is easy to crack, and the high rolling force also makes the consumption of tools and molds faster, and the processing cost increases

Method used

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  • A kind of hot rolling processing method of titanium and titanium alloy seamless oil pipe
  • A kind of hot rolling processing method of titanium and titanium alloy seamless oil pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: adopt TA2 alloy bar, specification is After the anti-oxidation lubricating coating is applied, it is heated to 950°C, and the cross-rolling and piercing is carried out with the above-mentioned setting parameters. The tube blank, preheated spare Mandrel, the surface is coated with SM-B mandrel lubricant and penetrated into the tube blank, and the pressure head is then jacked to prepare the tube There are 8 tube-jacking roll racks, which are coated with anti-oxidation lubricating paint after loosening and stripping, and then heated to 850°C for a second time and kept for 30 minutes. Out of the oven, it is prepared by 6 sets of stretching and reducing frame combination molds Ultrasonic flaw detection of the seamless oil pipe, determine the position of the head defect of the seamless oil pipe and cut the head, after heat treatment at 720°C, straighten after cooling to a temperature below 80°C, and test the mechanical properties of the seamless oil pipe ...

Embodiment 2

[0071] Embodiment 2: adopt TC4 alloy bar, specification is Heating to 1100°C, using the above set parameters for cross-rolling and piercing to prepare The tube blank, preheated spare Mandrel, the surface is coated with SM-B mandrel lubricant and penetrated into the tube blank, and the pressure head is then jacked to prepare the tube There are 10 pipe rolling and pipe jacking roll stands. After the tube blank is loosened and stripped, it is heated to 950°C for the second time and kept for 30 minutes. The furnace is prepared by 4 tensioning and reducing racks Ultrasonic flaw detection of the seamless oil pipe, determine the defect position of the pipe head and cut the head, heat treatment at 850°C and straighten at 450°C, test the mechanical properties of the seamless oil pipe, and pack it after passing the test.

[0072] The reference mechanical properties of the above TC4 alloy seamless tubing are shown in the table below.

[0073]

[0074] The average value of th...

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Abstract

The invention relates to a hot rolling machining method for a titanium and titanium alloy seamless oil pipe. Pure titanium TA2 bar and TC4 titanium alloy bar is adopted as the blank of the titanium and titanium alloy seamless oil pipe, and the initial specification is theta 150*1200mm. The hot rolling method comprises fifteen steps of smearing of anti-oxidation lubricating coating, heating, cross piercing, end pressing, hot rolling, bar releasing and removing, smearing of anti-oxidation lubricating coating, secondary heating, diameter expanding or reducing, flaw detection, end cutting, heat treatment, straightening, inspection and packaging. According to the invention, by smearing the anti-oxidation coating on the pure titanium TA2 bar and the TC4 titanium alloy bar as well as a machined pipe blank, since the anti-oxidation lubricating coating has dual functions of oxidation resistance and lubricating, oxidation of the surface of the titanium and titanium alloy seamless oil pipe can be reduced, the lubricating effect can be improved, the difficulty of surface micro cracks of the titanium and titanium alloy seamless oil pipe in the process of hot machining can be well solved, and synchronously, the procedure of pipe jacking is reduced, and deformation of each pass can be controlled.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy pipe processing, in particular to a hot rolling processing method for titanium and titanium alloy seamless oil pipes. Background technique [0002] Titanium and titanium alloy seamless oil pipes are pure titanium TA2 seamless oil pipes and TC4 titanium alloy oil pipes. The processing technology of titanium and titanium alloy seamless oil pipes currently adopts two methods, one is extrusion + boring inner hole + cold rolling process The other is the process of cross-rolling piercing + cold rolling. [0003] The reference process of extrusion + boring inner hole + cold rolling is as follows: [0004] 1) TA2 or TC4 titanium alloy bar drilling center through hole; [0005] 2) TA2 titanium alloy rods are coated with copper skin, that is, the outer surface and the central through hole are coated with copper skin; TC4 titanium alloy rods are evenly coated with glass lubricant on the outer surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06C22F1/18
CPCB21C37/06C22F1/183
Inventor 宋德军孙建刚胡伟民
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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