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A heat treatment method for titanium alloy oil pipe

A technology of titanium alloy tubing and heat treatment method, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of high cost, high strength of oil pipes, poor plasticity, etc., and achieve large-scale benefits, high production efficiency, low cost effect

Active Publication Date: 2016-01-13
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is a small-caliber, thin-walled and slender pipe, it is bundled in a vacuum annealing furnace. After the treatment, the pipe has a large curvature, high cost, and subsequent thermal straightening is difficult; the roller hearth protective atmosphere furnace requires a special inert gas such as argon. Protective gas, the cost is extremely high, and the bending degree after heat treatment is also large, and it will also encounter the problem of subsequent heat straightening
Oil pipes of T95, P110 and above grades have high strength and relatively poor plasticity, and can only be straightened at 600-650°C; titanium alloy pipes have low heat capacity, and the temperature drops quickly during transportation to the straightening machine after heating. Temperature, vacuum annealing furnace and roller hearth protective atmosphere furnace can no longer be used, only the heating furnace adjacent to the straightening machine can be used for heating, and the heating temperature must be increased to compensate for the temperature drop in the process, which will inevitably produce new oxidation and burning loss
Due to the above reasons, the heat treatment and straightening of titanium alloy tubing has become a major problem

Method used

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  • A heat treatment method for titanium alloy oil pipe
  • A heat treatment method for titanium alloy oil pipe
  • A heat treatment method for titanium alloy oil pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The steps of the heat treatment method for 88.9×6.45mm cold-rolled TC4 titanium alloy tubing are as follows:

[0060] A. Recrystallization annealing in quenching furnace

[0061] Put the cold-rolled TC4 titanium alloy tubing with a specification of 88.9×6.45mm on the feeding platform of the step-by-step continuous quenching furnace of the 159 heat treatment line. , the quenching furnace has 65 teeth, the first 44 teeth are the heating section, and the last 21 teeth are the heat preservation section, that is, the titanium alloy oil pipe is heated to 900-920°C in 36.67 minutes and held at this temperature for 17.5 minutes for recrystallization annealing; The step-by-step continuous quenching furnace is heated by natural gas, the air-fuel ratio is 12:1, and the volume concentration of residual oxygen in the furnace is 2.4-3.9%.

[0062] B. Air cooling through the quenching device

[0063] Turn off all the cooling water of the quenching device on the production line, lift...

Embodiment 2

[0079] The steps of the heat treatment method for 114.3×6.88mm cold-rolled TC4 titanium alloy oil pipe are as follows:

[0080] A. Recrystallization annealing in quenching furnace

[0081] Put the cold-rolled TC4 titanium alloy tubing with a specification of 114.3×6.88mm on the feeding platform of the step-type continuous quenching furnace of the 159 heat treatment line, and distribute the material one by one, and enter the quenching furnace one by one according to the stepping cycle of 58 seconds , the quenching furnace has 65 teeth, the first 44 teeth are the heating section, and the last 21 teeth are the heat preservation section, that is, the titanium alloy oil pipe is heated to 900-920°C in 42.5 minutes and held at this temperature for 20 minutes for recrystallization annealing treatment; The step-by-step continuous quenching and tempering furnace is heated by natural gas, the air-fuel ratio is 12:1, and the volume concentration of residual oxygen in the furnace is 3.1-4....

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Abstract

The invention relates to a thermal treatment method of a titanium alloy oil tube. The thermal treatment method comprises the following steps: performing recrystallization annealing by using a quenching furnace, air-cooling, treating in a quenching device, preserving heat in a tempering furnace, straightening and cooling. According to the method, an existing small-bore steel tube stepper type continuous quenching furnace and a thermal straightening production line are adopted to perform thermal treatment and straighten the titanium alloy oil tube, and the difficult that the performance and the straightness degree of the titanium alloy oil tube after primary treatment cannot be both achieved is solved; an oxidized layer and an oxygen permeation layer generated because of the difficulty are solved by further using a developed sand blasting and pickling process, and thus a high-efficiency scale production thermal treatment process for titanium alloy oil tubes is achieved.

Description

【Technical field】 [0001] The invention relates to a heat treatment method for a titanium alloy oil pipe. 【Background technique】 [0002] Titanium alloy tubing generally has an outer diameter of Φ60.3-114.3mm, a wall thickness of 4.83-6.88mm, and a length of 9.2-9.5 meters. The heat treatment process is 900-920°C heating and heat preservation and then air cooling. It is required that the curvature after straightening should not exceed 1.3mm. / M, to ensure that the screw thread processing and the full-length internal passage of the 1067mm diameter rod are qualified. The oil pipe specification is relatively single, but the batch size required is relatively large. [0003] At present, the heat treatment of small-diameter titanium alloy tubes is generally carried out in vacuum annealing furnaces and roller hearth protective atmosphere furnaces. Because it is a small-caliber, thin-walled and slender pipe, it is bundled in a vacuum annealing furnace. After the treatment, the pipe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18F16L9/02
Inventor 邹友富边华川郭元蓉江健刘波黄英张凯之王容成杨旭曾理冯庆彭海龙
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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