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Vacuum heat treatment process of cold rolled titanium strip coil for plate heat exchanger

A technology of vacuum heat treatment and titanium strip, which is applied in the field of metal material processing, can solve the problems of large application volume, low cupping value of titanium strip volume, low cupping value, etc., and achieve the effect of good performance uniformity

Active Publication Date: 2013-07-31
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Titanium plate heat exchangers are widely used in chemical industry, petroleum, metallurgy, electric power, shipbuilding and other industrial sectors. Vacuum annealing is a common heat treatment method for plate replacement with cold-rolled pure titanium coils. The heat transfer method mainly depends on thermal radiation. The heat transfer efficiency is low, and the performance uniformity of different parts of the titanium coil is difficult to guarantee. Referring to GJB3763A-2004, the conventional vacuum heat treatment process is used to treat the cold-rolled titanium coil, and the yield strength difference of different parts is above 80MPa. And the cupping value in the middle of the titanium coil is low, which cannot meet the requirements for the use of plates for plate heat exchangers
[0003] Continuous annealing or vacuum protective atmosphere annealing (also called vacuum argon-filled annealing) is adopted for foreign plate replacement with cold-rolled titanium coils. The vacuum annealing of the vacuum annealing, because its heat transfer is mainly carried out by radiation, the efficiency is low, the temperature difference between different parts of the titanium strip is very large, resulting in poor performance uniformity of different parts of the titanium strip after annealing, and the cupping value in the middle is low, which cannot meet the requirements of the plate type. Requirements for the use of plates for heat exchangers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Replace the degreased and deoiled 5.2-ton plate with a specification of 0.6*1250mm with a cold-rolled titanium coil and send it into a vacuum furnace to evacuate to 2.2×10 -2 Pa, heat up to 420°C at a speed of 12°C / min and hold for 4 hours, then heat up to 550°C at a speed of 5°C / min and hold for 5 hours, then heat up to 720°C at a speed of 0.8°C / min and hold for 12 hours After the heat preservation is over, cool to 520°C at a rate of 5°C / min, then fill with argon and cool to 100°C. According to GB / T 14845-2007 sampling test, the results show that the yield strength difference of each part of the titanium belt is not more than 10MPa, the maximum yield strength ratio is 0.68, the minimum cupping value is 11.5mm, and the pass rate of one stamping is 100%.

Embodiment 2

[0013] Replace the degreased and degreased 4.2-ton plate with a specification of 0.53*1250mm with a cold-rolled titanium coil and send it into a vacuum furnace to evacuate to 3.9×10 -2 Pa, heat up to 420°C at a speed of 7.5°C / min and hold for 4 hours, then heat up to 550°C at a speed of 3°C / min and hold for 6 hours, then heat up to 710°C at a speed of 1.0°C / min and hold for 10.5 hours After the heat preservation is over, cool to 500°C at a rate of 4°C / min, then fill with argon and cool to 100°C. According to the sampling test of GB / T 14845-2007, the results show that the yield strength difference of each part of the titanium belt is not more than 15MPa, the maximum yield strength ratio is 0.71, the minimum cupping value is 11.5mm, and the pass rate of one stamping is 100%.

Embodiment 3

[0015] Replace the degreased and deoiled 3.9-ton plate with a specification of 0.48*1250mm with a cold-rolled titanium coil and send it into a vacuum furnace to evacuate to 7.2×10 -2 Pa, heat up to 400°C at a speed of 5.8°C / min and hold for 4 hours, then heat up to 520°C at a speed of 2°C / min and hold for 6 hours, then heat up to 700°C at a speed of 1.2°C / min and hold for 10.5 hours , after the heat preservation is completed, cool to 480°C at a rate of 3°C / min, and then fill with argon and cool to 100°C. According to the sampling test of GB / T 14845-2007, the results show that the yield strength difference of each part of the titanium belt is not more than 15MPa, the maximum yield strength ratio is 0.72, the minimum cupping value is 11.5mm, and the pass rate of one stamping is 100%.

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Abstract

The invention relates to a vacuum heat treatment process of a cold rolled titanium strip coil for plate heat exchanger. The process comprises the following steps of: vacuumizing the cold rolled titanium strip coil for plate heat exchanger in a vacuum furnace to (1-8)*10-2Pa; raising the temperature to 300 to 450 DEG C at the speed of 5 to 15 DEG C / min and keeping the temperature for 1 to 6 hours;raising the temperature to 500 to 600 DEG C at the speed of 2 to 10 DEG C / min and keeping the temperature for 2 to 8 hours; raising the temperature to 650 to 760 DEG C at the speed of 0.5 to 5 DEG C / min, and keeping the temperature for 8 to 18 hours; and after temperature maintenance, cooling the cold rolled titanium strip coil to 400 to 550 DEG C at the speed of 0.5 to 5 DEG C / min, filling argoninto the vacuum furnace to cool the cold rolled titanium strip coil to 100 DEG C, and taking out the cold rolled titanium strip coil from the furnace. The uniformity of the performances of the cold rolled titanium strip coil for plate heat exchanger processed by the heat treatment process is high, the yield strength difference of each part is not more than 15Mpa, the yield strength ratio is not more than 0.72, the cup drawing value is not less than 11.5mm, and the pass percent of punching at one time can be up to over 99.5 percent.

Description

technical field [0001] The invention relates to a metal material processing technology, in particular to a vacuum heat treatment process for replacing plates with cold-rolled titanium coils. Background technique [0002] Titanium plate heat exchangers are widely used in chemical industry, petroleum, metallurgy, electric power, shipbuilding and other industrial sectors. Vacuum annealing is a common heat treatment method for plate replacement with cold-rolled pure titanium coils. The heat transfer method mainly depends on thermal radiation. The heat transfer efficiency is low, and the performance uniformity of different parts of the titanium coil is difficult to guarantee. Referring to GJB3763A-2004, the conventional vacuum heat treatment process is used to treat the cold-rolled titanium coil, and the yield strength difference of different parts is above 80MPa. Moreover, the cupping value in the middle of the titanium coil is low, which cannot meet the requirements for the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02
Inventor 顾新盛包淑娟刘茵琪任占峰王非王卫超
Owner LUOYANG SUNRUI TI PRECISION CASTING