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Vacuum protection atmosphere annealing process of industrial pure titanium roll

A technology of vacuum protection, industrial pure titanium, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of unsatisfactory surface quality, high heat treatment temperature and time, bonding of titanium coils, etc., to shorten the annealing cycle and surface quality. The effect of improving and reducing production costs

Inactive Publication Date: 2010-02-24
湖南湘投金天钛金属股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat treatment temperature is too high and the time is too long, it is easy to cause the titanium coil to stick, and the surface will stick after uncoiling, and the surface quality cannot meet the requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Put the titanium roll with clean surface into the vacuum protective atmosphere annealing furnace, and vacuum until the vacuum degree reaches 1.0×10 -3 After Pa, start to rise to 450°C at a rate of 150°C / h, and keep warm for 2 hours;

[0014] (2) Argon gas with a purity higher than 99.99% is used to circulate in the furnace at a pressure of -10kPa to -5kPa, and the titanium coil is heated to 680°C at a heating rate of 100°C / h and kept for 4 hours;

[0015] (3) After the heat preservation is over, turn off the heating system, cool down to 540°C at a cooling rate of 150°C / h, turn on the forced cooling system with a heat exchanger to accelerate the cooling, and cool to 170°C before being released from the furnace.

Embodiment 2

[0017] (1) Put the titanium coil with clean surface into the vacuum protective atmosphere annealing furnace, close the furnace door and start high vacuum, when the vacuum degree reaches 1.0×10 -3 After Pa, start to heat up the titanium coil to 500°C at a heating rate of 100°C / h, and keep it warm for 1.5 hours;

[0018] (2) Argon gas with a purity higher than 99.99% is used to circulate in the furnace, and the pressure of the argon gas in the furnace is controlled to be a slight negative pressure of -10kPa to -5kPa. Heat the titanium coil to 740°C at a heating rate of 150°C / h and keep it warm for 2 hours;

[0019] (3) After the heat preservation is over, turn off the heating system, and then cool down to 460°C at a cooling rate of 140°C / h, then turn on the forced cooling system with a heat exchanger to accelerate the cooling, and cool to 170°C.

Embodiment 3

[0021] (1) Put the titanium roll with clean surface into the vacuum protective atmosphere annealing furnace, and vacuum until the vacuum degree reaches 1.0×10 -3 After Pa, start to raise the temperature to 430°C at a rate of 150°C / h, and keep it warm for 2.5 hours;

[0022] (2) Argon gas with a purity higher than 99.99% is used to circulate in the furnace at a pressure of -10kPa to -5kPa, and the titanium coil is heated to 620°C at a heating rate of 100°C / h, and kept for 6 hours:

[0023] (3) After the heat preservation is over, turn off the heating system, cool down to 500°C at a cooling rate of 150°C / h, turn on the forced cooling system for accelerated cooling, and leave the furnace after cooling to 170°C.

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Abstract

The invention discloses a vacuum protection atmosphere annealing process of an industrial pure titanium roll, which comprises the following steps: charging a titanium roll with clean surface into a vacuum protection atmosphere annealing furnace; evacuating and heating to 430-500 DEG C and keeping the temperature for 1.5-2.5 hours; circulating in the furnace by a high-purity inert gas under the condition of micro-negative pressure; heating to 600-750 DEG C to insulate for 2-8 hours and then cooling to 400-550 DEG C; starting a forced cooling system to accelerate cooling; and discharging till the titanium roll is cooled to 170 DEG C. The mechanical performance, the chemical component and the surface quality of the annealed titanium roll can meet the requirements of a user; after the forced cooling system with a heat exchanger is adopted, the inert gas can be cooled by the heat exchanger, thereby greatly shortening the annealing period and reducing the annealing energy consumption and theproduction cost.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, in particular to a vacuum protection atmosphere annealing process for industrial pure titanium coils. Background technique [0002] Due to the active chemical properties of titanium, it is easy to react with O, N, H and other elements in the air at high temperature, forming a pollution layer on the surface, resulting in a decrease in its strength and plasticity, and an increase in hardness, which seriously affects subsequent processing and use. Therefore, at present, the annealing of finished titanium coils mostly uses a vacuum heating furnace or a full-hydrogen bell annealing furnace that transforms the original annealed steel coils for heat treatment in a protective atmosphere. However, annealing in a vacuum furnace is likely to cause inconsistencies in the microstructure of the inner and outer rings of the titanium coil, and the processing period becomes longer, which increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/02C21D1/26C21D9/52
Inventor 周慧谢大可刘勇李章珩刘建东向午渊覃静丽谢敏韩志强刘正乔姜媛媛
Owner 湖南湘投金天钛金属股份有限公司
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