Method for bright annealing of partially recrystallized zirconium alloy tubing

By optimizing the annealing process of zirconium alloy tubes through vacuum annealing experiments and argon protection, the problems of uneven performance and surface oxidation of zirconium alloy tubes after cold rolling were solved, and high-performance partially recrystallized zirconium alloy tubes were obtained.

CN122128649APending Publication Date: 2026-06-02XIAN WESTERN ENERGY MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN WESTERN ENERGY MATERIAL TECH CO LTD
Filing Date
2026-03-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies make it difficult to obtain a partially recrystallized state with excellent performance after cold rolling of zirconium alloy tubes. Furthermore, severe work hardening occurs inside the material after cold rolling, affecting subsequent processing performance. In addition, zirconium alloys are prone to gas absorption, leading to surface quality problems.

Method used

The annealing temperature and holding time were determined through vacuum annealing experiments. Combined with experiments on the loading amount of an industrial annealing furnace and argon protection, the annealing process was optimized to obtain partially recrystallized zirconium alloy tubes with excellent mechanical properties and surface quality.

Benefits of technology

This method achieves consistent performance and surface brightness in partially recrystallized zirconium alloy tubing, reducing defect rates and production costs while improving production efficiency.

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Abstract

This invention relates to the field of material heat treatment technology, and particularly to a method for bright annealing partially recrystallized zirconium alloy tubes. The method includes: 1) taking samples in an annealing test furnace to conduct annealing experiments based on the recrystallization volume fraction requirements or the mechanical property requirements corresponding to the partially recrystallized microstructure of the partially recrystallized zirconium alloy tube, and obtaining the required annealing process range; 2) conducting annealing experiments according to the obtained annealing regime to determine the annealing charge; 3) conducting annealing experiments according to the determined charge, and measuring the material venting temperature range under large charge conditions; 4) determining the argon charging and argon venting temperatures during the heating stage according to the measured venting temperatures; 5) conducting bright annealing of the partially recrystallized zirconium alloy tube according to the determined annealing regime, charge, and argon charging temperature to obtain tubes that meet the requirements for mechanical properties and surface quality. This method can yield partially recrystallized zirconium alloy tubes with excellent mechanical properties and surface quality.
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