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Vacuum annealing process of heavy pure titanium coils for cold rolling

An annealing process and vacuum annealing furnace technology, applied in the field of heat treatment of pure titanium, can solve the problems of insufficient surface cleanliness of titanium coils, reduce energy consumption of annealing process, shorten annealing cycle, etc. Mechanical properties, effect of prolonged annealing time

Active Publication Date: 2016-05-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN101654767A discloses a vacuum protective atmosphere annealing process for industrial pure titanium coils, which can greatly shorten the annealing cycle and reduce the energy consumption of the annealing process, but the surface cleanliness of the titanium coils after annealing is not high enough, and the structure of the whole roll is not uniform enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]A. Clean the surfaces of three titanium coils with weights of 7.75t, 7.66t and 7.58t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 2.0×10 -3 After Pa, then the furnace temperature was raised to 480°C at a heating rate of 100°C / h, and kept for 6 hours;

[0041] B. After continuing to raise the furnace temperature to 630°C at a heating rate of 50°C / h, start filling the furnace with argon gas with a purity of 99.99% to a pressure of 6.5kPa, turn on the circulation fan, and keep it warm for 6 hours;

[0042] C. Turn off the heating, and after cooling naturally to the furnace temperature of 350°C, turn on the forced cooling system until the furnace temperature is cooled to 120°C before being released from the furnace.

[0043] After testing, the obtained titanium coil has uniform metallic gloss on the surface and high cleanliness; the grain size of the outer, middle and inner rings of the titanium coil is 7.0, and the average yield strengths are ...

Embodiment 2

[0045] A. Clean the surfaces of three titanium coils with weights of 7.83t, 7.76t and 7.74t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 2.0×10 -3 After Pa, then the furnace temperature was raised to 450°C at a heating rate of 80°C / h, and kept for 5.5 hours;

[0046] B. After continuing to raise the furnace temperature to 580°C at a heating rate of 20°C / h, start filling the furnace with argon gas with a purity of 99.99% to a pressure of 8.0kPa, turn on the circulation fan, and keep it warm for 6.5 hours;

[0047] C. Turn off the heating, and after cooling naturally to the furnace temperature of 370°C, turn on the forced cooling system until the furnace temperature is cooled to 120°C before being released from the furnace.

[0048] After testing, the obtained titanium coil has uniform metallic gloss on the surface and high cleanliness; the grain size of the outer, middle and inner rings of the titanium coil are all 7.0, and the average yield stren...

Embodiment 3

[0050] A. Clean the surfaces of three titanium coils with weights of 7.33t, 7.57t and 7.48t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 2.0×10 -3 After Pa, then raise the furnace temperature to 500°C at a heating rate of 100°C / h, and keep the temperature for 4.5 hours;

[0051] B. After continuing to raise the furnace temperature to 650°C at a heating rate of 30°C / h, start filling the furnace with argon gas with a purity of 99.99% to a pressure of 2.5kPa, turn on the circulation fan, and keep it warm for 4.5 hours;

[0052] C. Turn off the heating, cool naturally to the furnace temperature of 330°C, and then turn on the forced cooling system until the furnace temperature is cooled to 110°C before being released from the furnace.

[0053] After testing, the obtained titanium coil has uniform metallic gloss on the surface and high cleanliness; the grain size of the outer, middle and inner rings of the titanium coil is 7.0, and the average yield st...

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Abstract

The invention discloses a vacuum annealing process of a cold-rolled high-purity large titanium coil. The vacuum annealing process comprises the following steps: a high-purity large titanium coil with the cleaned surface is put in a vacuum annealing furnace; the forvacuum is performed for the vacuum furnace until the vacuum degree is not higher than 2.0*10-3 Pa; then, the temperature of the furnace is increased to 450-500 DEG C by the heating speed of 50-100 DEG C / h, and is kept for 4-8 hours; after the temperature of the furnace is continuously increased to 580-650 DEG C by the heating speed of 20-50 DEG C / h, inert gas with the purity not lower than 99.99% is charged in the furnace until the pressure is 2.0-8.0 kPa, and the temperature is kept for 4-8 hours; after the heating is stopped, and the temperature of the furnace is naturally cooled to 330-370 DEG C, a forced cooling system is started; and when the temperature of the furnace is not higher than 150 DEG C, the titanium coil is taken out. The vacuum annealing process properly prolongs the annealing time, so that the ton titanium energy consumption is not increased, the consistent grain size and uniform tissue of the whole titanium coil after the annealing can be guaranteed, and the excellent mechanical performance is realized.

Description

technical field [0001] The invention relates to a heat treatment process for pure titanium, in particular to a vacuum annealing process for cold-rolling a large coil of heavy pure titanium coil. Background technique [0002] Industrial pure titanium has different recrystallization temperatures in the range of 450-550°C depending on the impurity components and cold deformation rate. The annealing temperature of titanium coils should be higher than the recrystallization temperature to ensure the recrystallization of titanium coils. Completely, wherein, the annealing temperature refers to the temperature that should be heated to reach during annealing. The chemical properties of titanium are active, and it is easy to react with O, H, N and other elements in the air at high temperature to form an oxide layer, which deteriorates the physical and chemical properties, not only increases the hardness and brittleness, but also reduces the plasticity and elasticity. The adsorption of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02
Inventor 肖聪李军彭琳向安平王莹卢东林崇智杨柳谢韶
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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