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Manufacturing technology of zirconium alloy cladding tubular product

A preparation process and cladding tube technology, which is applied in the field of zirconium alloy cladding tube preparation technology, can solve the problems such as the preparation process of N36 zirconium alloy finished cladding tube, etc., achieve uniform microstructure, improve comprehensive performance, and process good stability effect

Active Publication Date: 2017-09-01
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: there is no reported problem in the prior art that is applicable to the preparation process of N36 zirconium alloy cladding pipe material, and the purpose is to provide a zirconium alloy cladding pipe material preparation process suitable for N36 zirconium alloy

Method used

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  • Manufacturing technology of zirconium alloy cladding tubular product
  • Manufacturing technology of zirconium alloy cladding tubular product
  • Manufacturing technology of zirconium alloy cladding tubular product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation process for a zirconium alloy cladding pipe, comprising:

[0039] (1) Preparation of extrusion billet

[0040] The N36 zirconium alloy is smelted three times on a vacuum consumable electric arc furnace to prepare a finished N36 zirconium alloy ingot; then a 2500-ton fast forging machine is used to forge the ingot at 1050°C The billet is cut into 450mm long bars by a sawing machine; induction heating is carried out at 1100°C, water quenching is carried out after holding for 20 minutes, and the cooled bars are machined into extruded ingots, is the outer diameter of the tube, is the inner diameter of the tube.

[0041] During water quenching, the volume of cooling water is not less than 40 times the volume of the quenched billet, and the transfer time is controlled within 40s.

[0042] (2) Tube extrusion

[0043]On the 4,000-ton extrusion machine, the extrusion ingot is coated with glass coating, and then the billet is heated to 620°C by induction he...

Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that the process parameters of each step in this embodiment are different, and the specific settings are as follows:

[0055] During the extrusion process of the tube billet in step (2), a resistance furnace is used for heating to 680° C., and the extrusion is carried out after 150 minutes of heat preservation.

[0056] During the first pass rolling and intermediate annealing process in step (3), the intermediate annealing temperature after the first pass rolling is 650°C.

[0057] After the final pass of cold rolling in step (5), final recrystallization annealing is performed at 640°C.

Embodiment 3

[0059] The difference between this embodiment and Embodiment 1 is that the process parameters of each step in this embodiment are different, and the specific settings are as follows:

[0060] During the extrusion process of the tube billet in step (2), induction heating is used for heating to 580° C., and extrusion is carried out after 15 minutes of heat preservation.

[0061] During the first pass rolling and intermediate annealing process in step (3), the intermediate annealing temperature after the first pass rolling is 570°C.

[0062] After the final pass of cold rolling in step (5), final stress relief annealing is performed at 450°C.

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Abstract

The invention discloses a manufacturing technology of a zirconium alloy cladding tubular product. The manufacturing technology of the zirconium alloy cladding tubular product solves the problem that in the prior art, a manufacturing technology suitable for an N36 zirconium alloy finished-product cladding tubular product is not provided. The manufacturing technology of the zirconium alloy cladding tubular product comprises the steps that (1) N36 zirconium alloy is made into an extrusion ingot after smelting, forging and quenching; (2) the extrusion ingot is made into a tube blank with the outer diameter being 71-79 mm and the inner diameter being 40-50 mm through thermal extrusion; (3) the tube blank is rolled into a tube blank with the outer diameter being 50-60 mm and the wall thickness being 10-11.5 mm through the first pass, and annealing is conducted after rolling; (4) cold rolling is conducted for 3-4 passes, finally the cladding tubular product is manufactured, and intermediate annealing is conducted between two adjacent passes of cold rolling; and (5) after final stress relief annealing or final recrystallization annealing is conducted, the cladding tubular product is made into the finished-product tubular product. The manufacturing technology of the zirconium alloy cladding tubular product has the advantages of being stable in technology, high in finished product rate and the like. Besides, the manufactured tubular product has the advantages of being quite excellent in corrosion resistance, tensile property, bursting property, texture, CSR and the like.

Description

technical field [0001] The invention relates to the technical field of processing nuclear fission reactor fuel assembly structural materials, in particular to a preparation process for zirconium alloy cladding pipes. Background technique [0002] The safety and reliability of the fuel element zirconium alloy cladding used in the reactor is very important to ensure the safe operation of the reactor. Fuel elements are exposed to extremely harsh working conditions such as neutron irradiation, high temperature, and high pressure cooling medium scour in the stack, which will degrade the performance of the zirconium alloy cladding and even lead to failure. Usually, the main causes of fuel element cladding failure in light water reactors are: water side corrosion, hydrogen embrittlement, creep, fatigue, radiation damage, etc. Among them, water side corrosion is the main factor leading to fuel element failure. Early zirconium alloy cladding materials mainly include Zr-2 and Zr-4 al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 赵文金易伟黄照华潘钱付蒋明忠杨忠波王贯春邱军戴训卓洪
Owner NUCLEAR POWER INSTITUTE OF CHINA
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