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Titanium plate coil pressure control annealing process

An annealing process, a technology of titanium plates, applied in the field of heat treatment of metal materials, can solve problems such as poor quality, increased material consumption and workload, and reduced production efficiency

Inactive Publication Date: 2010-01-27
YUNNAN TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annealing without inert gas protection is carried out in an open environment. After annealing, there is an oxide layer on the surface of the titanium coil, and the quality is poor. After annealing, the oxide layer needs to be cleaned, which not only increases material consumption and workload, but also reduces production efficiency.

Method used

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  • Titanium plate coil pressure control annealing process
  • Titanium plate coil pressure control annealing process
  • Titanium plate coil pressure control annealing process

Examples

Experimental program
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Effect test

no. 1 Embodiment

[0031] The first embodiment of the pressure-controlled annealing process for titanium coils of the present invention includes: putting cold-rolled titanium coils into an annealing furnace; 3 The flow rate per hour completely replaces the atmosphere in the furnace with argon with a purity greater than 98%, until the pressure in the furnace is a positive pressure of 10Pa, so that the purity of the argon atmosphere in the furnace is greater than 98%, and then the titanium is heated at a heating rate of 100°C / hour. The coil is heated to 630±10°C and held for 1 hour. 3 / hour and 30 meters 3 The flow rate per hour is fed into argon to maintain the pressure in the furnace at 10Pa; at 2 meters 3 The flow rate per hour is continuously fed with argon to keep the pressure in the furnace at 10 Pa, and the titanium coil is cooled to room temperature at a cooling rate of 50 ° C / hour; the titanium coil is rolled out of the furnace.

[0032] The annealed titanium coil can be directly sen...

no. 2 Embodiment

[0034] The second embodiment of the pressure-controlled annealing process for titanium coils of the present invention comprises: putting cold-rolled titanium coils into an annealing furnace, which is the above-mentioned bell annealing furnace; 3The flow rate per hour completely replaces the atmosphere in the furnace with argon with a purity greater than 99%, until the pressure in the furnace is a positive pressure of 5000Pa, so that the purity of the argon atmosphere in the furnace is greater than 99%, and then the titanium is heated at a heating rate of 150°C / hour. The coil is heated to 680±10°C and held for 2 hours. 3 The flow rate per hour is fed into argon, and it is kept at 20 meters during the heat preservation process 3 The flow rate per hour is fed with argon to maintain the pressure in the furnace at 5000Pa; under the condition of maintaining the pressure in the furnace at 5000Pa, first slowly cool the titanium coil to 500°C at a cooling rate of 45°C / h, and then chang...

no. 3 Embodiment

[0037] The third embodiment of the pressure-controlled annealing process for titanium coils of the present invention includes: putting cold-rolled titanium coils into an annealing furnace, which is the above-mentioned bell annealing furnace; 3 The flow rate per hour completely replaces the atmosphere in the furnace until the pressure in the furnace is 10000Pa positive pressure, so that the purity of the argon atmosphere in the furnace is greater than 99.99%. During the replacement process, the titanium coil is heated at a heating rate of 200°C / hour to 730±10°C and heat preservation for 3 hours, during the heat preservation process at 40 meters 3 The flow rate per hour is fed into the above-mentioned argon to maintain the pressure in the furnace at 10000Pa; under the condition of maintaining the pressure in the furnace at 10000Pa, the titanium coil is cooled to about 55°C at a cooling rate of 80°C / h. rice 3 The flow rate per hour is fed with argon; the titanium plate is rolled...

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Abstract

The invention provides a titanium plate coil pressure control annealing process which comprises the following steps: replacing gas in an annealing furnace by inert gases at a flow of 20-120m<3> / h until the positive pressure in the annealing furnace is 10-10,000Pa, heating the titanium plate coil to be higher than the recrystalization temperature at a heating speed of 50-200 DEG C / h and keeping the temperature for 2-25h, always leading the inert gases into the annealing furnace at a flow of 20-120m<3> / h during the heating and the heat preservation; cooling the titanium plate coil to the discharge temperature at a cooling speed of 10-150 DEG C under the condition of leading the inert gases into the annealing furnace at a flow of 1m<3> / h to 20m<3> / h so as to enable the pressure in the annealing furnace to be kept at 10-10,000Pa; and discharging the titanium plate coil out of the annealing furnace. The pressure control annealing process enables the inside of the annealing furnace not to have negative pressure or overhigh pressure, can improve the surface quality of the annealed titanium plate coil without cleaning an oxide layer after the annealing, improve the product quality, lower the energy consumption and the material loss, and improvethe production efficiency.

Description

technical field [0001] The present invention relates to the heat treatment process of metal materials, to be precise, relates to the treatment of titanium coils by bell annealing furnace, especially cold-rolled industrial pure titanium coils. Background technique [0002] Pure titanium has some characteristics different from steel. For example, the crystal has an allotropic structure, a close-packed hexagonal structure below 882 ° C, less slip systems, obvious anisotropy, active chemical properties, and a significant cold-working deformation strengthening effect. Coil or plate titanium material (hereinafter referred to as titanium coil) needs annealing treatment after cold rolling. Cold deformed industrial pure titanium has a recrystallization temperature between 450-550°C depending on the impurity composition and cold deformation rate, and the annealing temperature should be higher than the recrystallization temperature. The chemical properties of titanium are active, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C21D1/26C21D1/76
Inventor 苏鹤洲史亚鸣刘昆曹占元
Owner YUNNAN TITANIUM IND