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Vacuum annealing and performance uniformity control method for nuclear zirconium alloy pipe

A control method, technology of vacuum annealing furnace, applied in the direction of heat treatment process control, manufacturing tools, furnace type, etc., can solve problems such as difficult to deal with in time, inapplicable, complicated furnace loading, etc., to simplify furnace loading operation steps and ensure uniformity Consistency, the effect of avoiding potential risks

Active Publication Date: 2022-02-08
西安西部新锆科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Under the conditions determined by the vacuum annealing furnace, the mechanical properties and microstructure of the zirconium alloy pipe are directly related to the furnace loading method, because the heat transfer of the material in the vacuum annealing is slow Due to the characteristics of industrial production, it is often difficult to achieve precise control of the temperature of all materials
At present, in industrial production, the method of trial and error or the method of inserting workpieces along with the furnace is mainly used for industrial-grade annealing, but the trial and error method often requires multiple furnaces of trial and error to determine the final annealing method, and has a degree of dependence on experience Disadvantages of high cost, high cost, and long cycle; the method of inserting the workpiece pair along with the furnace has the disadvantages of complicated furnace loading, easy damage to the workpiece pair, or difficulty in timely handling of abnormal displays during the annealing process
At the same time, the above two methods are not suitable for new materials and new processes whose annealing system is unknown.

Method used

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  • Vacuum annealing and performance uniformity control method for nuclear zirconium alloy pipe
  • Vacuum annealing and performance uniformity control method for nuclear zirconium alloy pipe
  • Vacuum annealing and performance uniformity control method for nuclear zirconium alloy pipe

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Experimental program
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Effect test

Embodiment 1

[0066] This embodiment includes the following specific steps:

[0067] Step 1, sample method annealing

[0068] 1. Zirconium alloy pipe: grade: Zr-4; product specification: Φ32×5.2mm; mechanical properties: Rp0.2≥300MPa, Rm≥470MPa, A50≥27%; grain size: not less than 9 grades.

[0069] 2. Use a vacuum annealing furnace to carry out annealing tests on zirconium alloy samples with a size of Φ32×5.5×200mm, set the annealing temperature: 590±8°C, and hold time: 180min. After annealing, the mechanical property and metallographic structure of the sample were tested, and the mechanical property test results were: Rp0.2=377MPa, Rm=516MPa, A50=34%, which met the technical requirements.

[0070] Step 2: Preliminary optimization of furnace loading method

[0071] 1. Use a 5-meter internal thermal vacuum annealing furnace to carry out the furnace loading test of industrialized zirconium alloy pipes. The annealing furnace consists of a furnace body, a vacuum system, a cooling system, a co...

Embodiment 2

[0084] This embodiment includes the following specific steps:

[0085] Step 1, sample method annealing

[0086] 1. Zirconium alloy pipe: grade: Zr-Sn-Nb alloy; product specification: Φ18×1.8mm; mechanical property: Rp 0.2 ≥290MPa, Rm≥460MPa, elongation A50≥25%; grain size: no less than grade 9.

[0087] 2. Use a vacuum annealing furnace to carry out annealing tests on zirconium alloy samples with a size of Φ18×1.8×200mm, set the annealing temperature: 570°C, and hold time: 120min. After annealing, test the mechanical properties and metallographic structure of the sample, and the test results of the mechanical properties are: Rp 0.2 =387MPa, Rm=542MPa, A50=32%, meet the technical requirements.

[0088] Step 2: Preliminary optimization of furnace loading method

[0089] 1. Use a 7-meter internal heat vacuum annealing furnace to carry out the furnace loading test of industrialized zirconium alloy pipes. The annealing furnace consists of a furnace body, a vacuum system, a cool...

Embodiment 3

[0102] This embodiment includes the following specific steps:

[0103] Step 1, sample method annealing

[0104] 1. Titanium alloy pipe: grade: TA9; product specification: Φ25×2.5mm; mechanical properties: Rp0.2≥280MPa, Rm≥400MPa, A50≥20%; grain size: not less than 9 grades.

[0105] 2. Use a vacuum annealing furnace to carry out the annealing test of titanium alloy samples with a size of Φ25×2.5×500mm. Set the annealing temperature: 600±10°C, and the holding time: 90min. After annealing, test the mechanical properties and metallographic structure of the sample, the mechanical properties test results are: Rp0.2 = 298MPa, Rm = 453MPa, A50 = 29%, which meets the "titanium and titanium alloy tubes for heat exchangers and condensers" GB / T 3625 technical requirements.

[0106] Step 2: Preliminary optimization of furnace loading method

[0107] 1. Use a 7-meter internal thermal vacuum annealing furnace to carry out the furnace loading test of industrialized titanium alloy pipes. T...

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Abstract

The invention discloses a vacuum annealing and performance uniformity control method for a nuclear zirconium alloy pipe. The method comprises the following steps of sample method annealing, preliminary optimization of a charging mode, continuous optimization of the charging mode and determination of an annealing process. According to the method, on the basis of annealing parameters determined by a sample method annealing test, the same charging amount is adopted each time, a multi-furnace charging test is carried out on an industrial vacuum annealing furnace, and a corresponding charging mode is optimized under the condition that different areas of a furnace chamber meet the technical requirements for the mechanical property and the microstructure of the zirconium alloy pipe; and an equivalent annealing system for calculating the heat preservation time through the annealing furnace temperature control even arrival temperature is determined, then the industrial-grade annealing method is determined, and the uniformity and consistency of the performance of the zirconium alloy pipe are effectively guaranteed. The method is wide in application range and can be used for screening annealing methods of industrial-grade zirconium alloy or other alloy pipes under the unknown annealing system, and the annealing system can be rapidly determined and expanded to be applied to the industrial production process through the method.

Description

technical field [0001] The invention belongs to the technical field of vacuum heat treatment of zirconium alloy pipes, in particular to a method for vacuum annealing and performance uniformity control of zirconium alloy pipes for nuclear use, the method is also suitable for vacuum annealing of titanium or other alloy pipes in addition to zirconium alloy pipes for nuclear use Annealing process. Background technique [0002] Zirconium alloy has small thermal neutron absorption cross section, high thermal conductivity, good mechanical properties, good processing performance and UO 2 Compatibility, especially in high-temperature, high-pressure water vapor working environment with good corrosion resistance and sufficient thermal strength, it is widely used as cladding material and core structure material of water-cooled power reactors, and has become an important application material for nuclear power plants , its performance directly affects the safety, reliability and economy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D9/08C22F1/02C22F1/18
CPCC21D11/00C21D9/08C22F1/02C22F1/186Y02E30/30
Inventor 王旭峰张伟刘海明张海芹周军杨锋雷江李宇力孙涛涛
Owner 西安西部新锆科技股份有限公司