Vacuum Annealing Process of Cold Rolled Industrial Pure Titanium Coil

A technology of industrial pure titanium and annealing process, applied in the field of heat treatment of pure titanium, can solve the problems that the annealing process affects the surface finish and the uniformity of the structure, the surface cleanliness of the titanium coil is not high enough, and the structure is not uniform enough, etc. Uniformity, excellent mechanical properties, uniform structure

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 process 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 process of titanium plate and titanium strip cannot be directly used for the annealing of titanium coils.
[0005] CN101654767A discloses a vacuum protective atmosphere annealing process for industrial 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 cold-rolled titanium coils with a mass of 6.57t / 6.89t / 7.04t 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 460° C. at a heating rate of 50° C. / h, and kept for 3 hours;

[0042] B. After continuing to raise the furnace temperature to 630°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 5 hours;

[0043] 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.

[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 7.0, and the average...

Embodiment 2

[0046] A. Clean the surface of three cold-rolled titanium coils with a mass of 6.75t / 7.23t / 7.30t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 2.0×10 -3 After Pa, the furnace temperature was raised to 450°C at a heating rate of 50°C / h and kept for 3.5 hours;

[0047] 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 7.0kPa, turn on the circulation fan, and keep it warm for 4.5 hours;

[0048] C. Turn off the heating, cool the furnace temperature to 370°C at a cooling rate of 70°C / h, and then turn on the forced cooling system until the furnace temperature is cooled to 140°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, and the average yield...

Embodiment 3

[0051] A. Clean the surface of three cold-rolled titanium coils with a mass of 7.20t / 6.96t / 7.28t respectively, put them into a vacuum annealing furnace, and pre-evacuate to 2.0×10 -3 After Pa, the furnace temperature was raised to 500°C at a heating rate of 60°C / h, and kept for 2 hours;

[0052] B. After continuing to raise the furnace temperature to 600°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 5.0kPa, turn on the circulation fan, and keep it warm for 6.5 hours;

[0053] C. Turn off the heating, cool the furnace temperature to 330°C at a cooling rate of 80°C / h, and then turn on the forced cooling system until the furnace temperature cools to 130°C before leaving 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 7.0, and the average yield strength is 195MP...

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Abstract

The present invention discloses a vacuum annealing technology of cold rolled commercial pure titanium coils, the technology comprising the following steps: putting 3 cold rolled commercial pure titanium coils of which the surface has been cleaned into a vacuum annealing furnace, and pre-vacuumizing the vacuum furnace until the vacuum degree is not higher than 2.0*10-3Pa; heating the furnace at a heating rate of 40~90 DEG C / h until the temperature of the furnace reaches 450~500 DEG C, and maintaining this temperature for 3~6 hours; keeping heating the furnace at a heating rate of 50~100 DEG C / h until the temperature of the furnace reaches 600~680 DEG C, adding inert gas of which the purity is not less than 99.99% into the furnace until the pressure reaches 2.0~8.0 kPa, and maintaining this temperature for 4~8 hours; closing the heating system, cooling the furnace at a cooling rate of 50~100 DEG C / h until the temperature of the furnace drops to 330~370 DEG C, starting a forced cooling system, and taking out the titanium coils when the temperature of the furnace is not higher than 150 DEG C. The smooth finish of annealed titanium coils is even. Through test, it is found that both the inner and external coils are of homogeneous structure, and the mechanical property is good, so that the requirements are fully met.

Description

technical field [0001] The invention relates to a heat treatment process for pure titanium, in particular to a vacuum annealing process 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...

Claims

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Application Information

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