Preparing method of small-specification pure niobium bar with well-closed formation

A technology with uniform structure and small size, which is used in the field of preparation of small size pure niobium bars, which can solve the problems of easy wire breakage and poor structure uniformity.

Active Publication Date: 2020-04-10
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing small-sized pure niobium rods with uniform structure, which solves the problems of poor structure uniformity of niobium rods for superconducting wires and easy wire breakage during processing

Method used

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  • Preparing method of small-specification pure niobium bar with well-closed formation
  • Preparing method of small-specification pure niobium bar with well-closed formation
  • Preparing method of small-specification pure niobium bar with well-closed formation

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Effect test

Embodiment 1

[0040] The present invention adopts a kind of preparation method of uniform small-scale pure niobium bar material, specifically implements according to the following steps:

[0041] A pure niobium billet with a diameter of Φ85mm was selected, and at room temperature, that is, 25°C, it was precision forged into a Φ45mm billet with one fire and three passes at room temperature, with a total deformation of 72.0%.

[0042] Carry out recrystallization annealing heat preservation in the vacuum annealing furnace, the temperature is 900 ℃, and the vacuum degree of the heat preservation stage is 0.5*10 -2 Pa, the holding time is 120min.

[0043] Place the bar billet in a box-type resistance furnace at room temperature, that is, 25°C, and roll it on a transverse rolling mill to a finished billet with a size of Φ7.0mm, rolling for 18 passes, and the cumulative deformation of rolling is 97.6%; The pass type of the tandem rolling mill during rolling deformation is round-flat-square.

[0...

Embodiment 2

[0046] The present invention adopts a kind of preparation method of uniform small-scale pure niobium bar material, specifically implements according to the following steps:

[0047] Select a pure niobium billet with a specification of Φ100mm, place it in a box-type resistance furnace and heat it to 500°C, and use 1 fire and 5 passes for precision forging into a Φ45mm specification rolling billet, and the cumulative deformation of precision forging is 80.0%;

[0048] Use a vacuum annealing furnace for recrystallization annealing heat preservation, the annealing heat preservation temperature is 1200 ℃, and the vacuum degree in the heat preservation stage is 10 -2 Pa, the holding time is 240min;

[0049] The bar billet is placed in a box-type resistance furnace and heated to 500°C, and rolled on a transverse rolling mill to a finished billet with a size of Φ27mm. The cumulative deformation of the 4 rolling passes is 64.0%, and the rolling deformation The pass type of the horizon...

Embodiment 3

[0052] Select a Φ95mm pure niobium precision forged billet, place it in a box-type resistance furnace, heat it to 500°C, hold for 90 minutes, and use 1 heat and 3 passes to forge a Φ45mm specification rolling billet. The total amount of deformation in the precision forging process is 77.6%.

[0053] Place the Φ45mm rolling billet in a vacuum annealing furnace, raise the temperature to 1100°C and keep it for 130 minutes, and then cool the furnace to room temperature before it is released from the furnace.

[0054] Place the bar billet in a box-type resistance furnace and heat it to 500°C, keep it warm for 60 minutes, and then roll it on a transverse rolling mill, and use one heat and multiple passes to obtain a Φ27mm finished billet with a certain structure; rolling The manufacturing pass is 4 passes, the deformation amount of each pass is 10% to 25%, and the cumulative deformation amount of 1 fire is 64.0%.

[0055] Place the rolled billet in a vacuum annealing furnace, raise t...

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Abstract

The invention discloses a preparing method of a small-specification pure niobium bar with well-closed formation. The method specifically comprises the following steps of firstly, selecting a pure niobium precision forging bar blank, and adopting one-heating-number multi-pass precision forging to form a phi45 mm-specification rolled blank; secondly, using a vacuum annealing furnace for carrying outrecrystallization annealing insulation on the bar blank subjected to precision forging treatment in the first step; thirdly, rolling the treated bar blank to a finished bar blank on an open-train mill; fourthly, carrying out recrystallizing heat treatment on the rolled bar blank through the vacuum furnace, straightening and grinding the bar blank to form the pure niobium finished bar, through rolling deforming, completely breaking an original recrystallized structure to be close to the finished specification, and finally, through recrystallization annealing, obtaining the small-specificationpure niobium bar with the yield strength reaching 75 MPa, the tensile strength reaching 150 MPa, the ductility being 50%, the percentage of area contraction being 90%, low-power non-obvious flow line,and high-power grain range smaller than 2 levels. Batch consistency is good, and stability is good.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal material processing, and in particular relates to a method for preparing small-sized pure niobium rods with uniform structure. Background technique [0002] Pure niobium rods are generally used in the preparation of superconducting wires, and are an important raw material for preparing superconducting wires. Pure niobium rods have a large amount of deformation in the process of preparing superconducting wires. Taking the commonly used Φ11.8mm rods as an example, after many times of assembly and drawing, the diameter of a single rod is stretched to the micron level when the finished superconducting wire is processed. , The amount of deformation is over 99.9999%. The extremely large amount of deformation puts forward high requirements on the uniformity of the original structure of the bar, because the uneven structure will cause uneven deformation during processing, which will lead to wire...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/02B21C37/04
CPCB21C37/04C22F1/02C22F1/18
Inventor 付航涛孙小平侯峰起杨策白洁杨晶王凯旋刘向宏
Owner 西部超导材料科技股份有限公司
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