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Production method of titanium alloy seamless tubes used for tubing coupling

A production method, titanium alloy technology, applied in metal rolling and other directions, can solve problems such as poor plasticity, poor dimensional accuracy, and low yield

Active Publication Date: 2015-01-07
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the extrusion molding production method has low yield, poor dimensional accuracy, and high production cost; the production method of bar drilling and boring has better dimensional accuracy, but high processing cost, low production efficiency and low yield; Although the production method of cold drawing has a high yield, this type of titanium alloy has high strength at room temperature, poor plasticity, and high resistance to cold rolling deformation. It requires repeated annealing, low production efficiency, and high production cost.

Method used

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  • Production method of titanium alloy seamless tubes used for tubing coupling
  • Production method of titanium alloy seamless tubes used for tubing coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Taking the production of seamless pipes for 110X20TC4 tubing couplings as an example, the production process is as follows:

[0105] A, material preparation

[0106] Purchase TC4 titanium alloy whose chemical composition complies with GB / T3620.1-2007, forge and machine it into a round billet with a diameter of 160mm, and punch centering holes at both ends by machining, d=50±2mm, depth 45mm.

[0107] B, ring furnace heating

[0108] Heating with natural gas, the air-fuel ratio is set at 12:1. When heating at low temperature after entering the furnace, the temperature of the heat recovery section and the preheating section are 760-790°C, and the heating time is 120 minutes; 880°C, the heating time is 90 minutes; when heating at high temperature, the temperature of the third heating stage is 950-980°C; when the temperature is equalized, the soaking stage 1 and the second stage are 940-980°C, and the heating time is 90 minutes.

[0109] C, skew rolling piercing

[0110] ...

Embodiment 2

[0126] Taking the production of seamless pipes for 139X23TC4 oil pipe couplings as an example, the production process is as follows

[0127] A, material preparation

[0128] Purchase TC4 titanium alloy whose chemical composition complies with GB / T3620.1-2007, forge and machine it into a round billet with a diameter of 200mm, and punch centering holes at both ends by machining, d=50±2mm, depth 45mm.

[0129] B, ring furnace heating

[0130] Heating with natural gas, the air-fuel ratio is set at 12:1. When heating at low temperature after entering the furnace, the temperature of the heat recovery section and the preheating section are 760-790°C, and the heating time is 140 minutes; 880°C, the heating time is 110 minutes; when heating at high temperature, the temperature of the third heating stage is 950-980°C; when the temperature is equalized, the soaking stage 1 and the second stage are 940-980°C, and the heating time is 110 minutes.

[0131] C, skew rolling piercing

[013...

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Abstract

The invention discloses a production method of titanium alloy seamless tubes used for tubing coupling. According to the production technology of annular furnace heating, cross piercing, non-mandrel tube rolling, heating furnace heating and sizing, the special titanium alloy seamless tubes with the specifications being different and the performance meeting the requirements can be produced by using an existing mandrel mill set and dies of the existing mandrel mill set and adjusting technology parameters according to requirements. The special titanium alloy seamless tubes can be directly used for machining a tubing coupling machine without being subject to thermal treatment. The production method is simple, production conditions are easy to control, the yield is higher than 95%, mass production can be realized, and large scale benefits can be produced.

Description

technical field [0001] The invention relates to the technical field of production of titanium alloy seamless pipes, in particular to a production method of titanium alloy seamless pipes used for oil pipe couplings. Background technique [0002] Tubing coupling is a kind of oilfield drilling tool, mainly used for the connection of tubing. Titanium alloy is an important structural metal developed in the 1950s. It is widely used in various fields because of its high strength, corrosion resistance, and high heat resistance. [0003] Nowadays, titanium alloy oil pipe couplings are connected by special buckles, and the seamless pipes used for the couplings are mostly small-diameter thick-walled pipes. The production methods of these seamless pipes are mainly extrusion molding, bar drilling and boring, and skew rolling Cold rolling and cold drawing after piercing. [0004] However, the extrusion molding production method has low yield, poor dimensional accuracy, and high producti...

Claims

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Application Information

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IPC IPC(8): B21B19/04B21B19/10
Inventor 邹友富边华川郭元蓉冯庆江健李银来得志曾理黄英刘波张凯之
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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