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Vacuum annealing method for cold-rolled industrial pure titanium coil

A technology of industrial pure titanium and vacuum annealing furnace, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems affecting the surface finish and uniformity of the structure, the surface cleanliness of titanium coils is not high enough, and the annealing method is improper, etc., to achieve benefits The effect of annealing temperature uniformity, excellent mechanical properties, and consistent grain size

Active Publication Date: 2016-06-01
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

Improper annealing method will affect the surface finish and uniformity of structure. Due to the poor thermal conductivity of titanium, there is a big difference between coil annealing and strip annealing. The annealing method of titanium plate and titanium strip cannot be directly used for the annealing of titanium coils.
[0005] CN101654767A discloses a vacuum protection atmosphere annealing method for industrially pure titanium coils, which can greatly shorten the annealing cycle, but the surface cleanliness of the titanium coils after annealing is not high enough, and the structure of the whole coil is not uniform enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A. Clean the surface of three titanium coils with weights of 6.21t\6.37t\6.79t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 3.5×10 -3 After Pa, then the furnace temperature was raised to 550°C at a heating rate of 150°C / h, and kept for 4.5 hours;

[0042] B. After continuing to raise the furnace temperature to 650°C at a heating rate of 100°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 4 hours;

[0043] C. Turn off the heating, cool the furnace temperature to 350°C at a cooling rate of 80°C / h, and then turn on the forced cooling system until the furnace temperature is cooled to 150°C before being released from the furnace.

[0044] 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 7.5, the average yield strength ...

Embodiment 2

[0046] A. Clean the surface of three titanium coils with weights of 6.26t\6.40t\6.52t respectively, put them into the vacuum annealing furnace, and pre-vacuumize to 3.5×10 -3 After Pa, then the furnace temperature was raised to 500°C at a heating rate of 120°C / h, and kept for 5 hours;

[0047] B. After continuing to raise the furnace temperature to 700°C at a heating rate of 150°C / h, start filling the furnace with argon gas with a purity of 99.99% to a pressure of 7.0kPa, turn on the circulation fan, and keep warm for 3 hours;

[0048] C. Turn off the heating, cool the furnace temperature to 350°C at a cooling rate of 60°C / h, and then turn on the forced cooling system until the furnace temperature is cooled to 150°C before being released from the furnace.

[0049] 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 7.5, the average yield strength is...

Embodiment 3

[0051] A. Clean the surface of three titanium coils with weights of 6.33t\6.50t\6.82t respectively, put them into the vacuum annealing furnace, and pre-vacuumize to 3.5×10 -3 After Pa, then the furnace temperature was raised to 520°C at a heating rate of 120°C / h, and kept for 3.5 hours;

[0052] B. After continuing to raise the furnace temperature to 720°C at a heating rate of 100°C / h, start filling the furnace with argon gas with a purity of 99.99% to a pressure of 5.0kPa, turn on the circulation fan, and keep warm for 2.5 hours;

[0053] C. Turn off the heating, cool the furnace temperature to 350°C at a cooling rate of 60°C / h, and then turn on the forced cooling system until the furnace temperature is cooled to 150°C before being released from the furnace.

[0054] 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 7.5, the average yield strengt...

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Abstract

The invention discloses a vacuum annealing method of a cold-rolled commercial pure titanium coil. The vacuum annealing method comprises the following steps: a commercial pure 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 3.5*10-3 Pa; then, the temperature of the furnace is increased to 500-550 DEG C by the heating speed of 110-150 DEG C / h, and is kept for 3-6 hours; after the temperature of the furnace is continuously increased to 650-720 DEG C by the heating speed of 100-150 DEG C / h, inert gas with the purity not lower than 99.99% is charged in the furnace until the pressure is 5.0-8.0 kPa, and the temperature is kept for 2-4 hours; a heating system is shut down; after the temperature of the furnace is decreased to 330-370 DEG C by the cooling speed of 50-100 DEG C / h, 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 method can guarantee consistent grain size and uniform tissue of the whole titanium coil after the annealing, realizes excellent mechanical performance, and dose not largely prolong the process time.

Description

technical field [0001] The invention relates to a heat treatment method for pure titanium, in particular to a vacuum annealing method for pure titanium coils. 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 pure titanium is also strong. The r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02C21D1/26C21D9/52
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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