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A preparation method of small size pure niobium bar with uniform structure

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: 2021-09-03
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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  • A preparation method of small size pure niobium bar with uniform structure
  • A preparation method of small size pure niobium bar with uniform structure
  • A preparation method of small size pure niobium bar with uniform structure

Examples

Experimental program
Comparison scheme
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] Put the bar billet in a box-type resistance furnace, 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 the te...

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Abstract

The invention discloses a method for preparing a small-sized pure niobium bar with uniform structure, which is specifically implemented according to the following steps: Step 1. Select a pure niobium precision forged bar blank, and adopt 1 heat and multiple passes of precision forging to roll to a specification of Φ45mm Billet; step 2, using a vacuum annealing furnace to carry out recrystallization annealing and heat preservation on the bar stock that has been precision forged in step 1; step 3, rolling the processed bar stock on an in-line rolling mill to a finished bar stock; Step 4. Use vacuum furnace recrystallization heat treatment on the rolled billet, straighten and grind to the finished pure niobium bar; through rolling deformation, the original recrystallized structure is completely broken and close to the finished product specification, and finally through recrystallization After annealing, the yield strength reaches 75MPa, the tensile strength reaches 150MPa, the elongation reaches 50%, the reduction of area reaches 90%, the low-magnification has no obvious streamlines, and the high-magnification grain range is less than 2 grades of small-sized pure niobium rods, and Good batch consistency and stability.

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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Patent Type & Authority Patents(China)
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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