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Titanium plate coil 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

Active 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 annealing process
  • Titanium plate coil annealing process

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Experimental program
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Effect test

no. 1 Embodiment

[0030] The first embodiment of the titanium coil annealing process of the present invention includes: cleaning the titanium coil with a conventional chemical alkali cleaning method to degrease its surface; putting the degreased titanium coil into an annealing furnace; Purge the furnace for 15 minutes to replace the air in the furnace; after purging with nitrogen, use argon with a purity of 99.99% to completely replace the atmosphere in the furnace until the pressure in the furnace is 7000Pa positive pressure. Heat the titanium coil to 390°C at a heating rate of 1 hour and hold it for 2 hours, then heat it to 620°C at a heating rate of 150°C / hour and hold it for 2 hours; Cool the titanium coils to about 50°C at a cooling rate of 100°C; at the end of the cooling phase, purge the furnace with nitrogen for 15 minutes; remove the titanium coils from the furnace.

[0031] The annealed titanium coil can be directly sent to the subsequent processing process without further cleaning th...

no. 2 Embodiment

[0033]The second embodiment of the titanium coil annealing process of the present invention includes: cleaning the titanium coil with a conventional chemical alkali cleaning method to degrease its surface; putting the degreased titanium coil into an annealing furnace; Purge the furnace for 45 minutes to replace the atmosphere in the furnace; after purging with nitrogen, completely replace the atmosphere in the furnace with 99.999% argon until the pressure in the furnace is 6000Pa The coil is heated to 410°C and held for 1.5 hours, then heated to 580°C at a heating rate of 130°C / hour and held for 2 hours. 3 The flow rate per hour is fed into the above-mentioned argon gas; under the condition of maintaining the pressure in the furnace at 6000Pa, the titanium coil is cooled to 45°C at a cooling rate of 100°C / hour, and during the cooling process, it is 4 meters 3 The titanium coils are protected and cooled with argon at a flow rate of / hour; at the end of the cooling phase, the f...

no. 3 Embodiment

[0036] The third embodiment of the titanium coil annealing process of the present invention includes: putting the titanium coil into the annealing furnace; purging the inside of the annealing furnace with nitrogen for 37 minutes to replace the air in the furnace; The gas completely replaces the atmosphere in the furnace until the pressure in the furnace is 10000Pa positive pressure. While replacing, the titanium coil is heated to 400°C at a heating rate of 170°C / hour and kept for 2 hours, and then heated at 170°C / hour. Heating speed to 650°C and holding it for 3 hours; under the condition of maintaining the pressure in the furnace at 10000Pa, cool the titanium coil to 35°C at a cooling rate of 50°C / hour; at the end of the cooling stage, purge the furnace with nitrogen for 30 Minutes; roll the titanium plate out of the oven.

[0037] The annealed titanium coils can then be sent directly to subsequent processing steps without further cleaning of the titanium coil surface.

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Abstract

The invention provides a titanium plate coil annealing process which comprises the following steps: putting a titanium plate coil into an annealing furnace; replacing gas in the annealing furnace by inert gases 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; cooling the titanium plate coil to the discharge temperature at a cooling speed of 10-150 DEG C / h under the condition of keeping the pressure in the annealing furnace to be 10-10,000Pa; and discharging the titanium plate coil out of the annealing furnace. The annealing process can improve the surface quality of the annealed titanium plate coil without cleaning an oxide layer after annealing, improve the product quality, lower the energy consumption and the material loss and improve the 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 张竹明苏鹤洲史亚鸣赵宇刘昆曹占元
Owner YUNNAN TITANIUM IND