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Extrusion method of niobium tube

An extrusion method and niobium tube technology, which is applied in the field of niobium tube extrusion, can solve problems such as no production cases of niobium ingots and difficulties in processing niobium tubes, and achieve the effect of avoiding poor fluidity of niobium and avoiding unfavorable factors

Active Publication Date: 2014-05-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, niobium will be violently oxidized in air above 600°C, so the processing of niobium tubes has always been a difficult problem in the world
At present, domestic products are mainly imported and used. There is no domestic production case for direct extrusion of niobium ingots into seamless pipes.

Method used

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  • Extrusion method of niobium tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Domestic companies have requirements for Nb (niobium) tubes:

[0035] (1) Material: Nb (Nb content ≥99.95%, C content ≤0.01%, N content ≤0.007%, O content ≤0.007%, Fe content ≤0.005%, Ni content ≤0.005%, Si content ≤0.010%);

[0036] (2) Specification: Φ154×14.5mm

[0037] (3) Length: 7m

[0038] (4) Technical requirements: ①Outer diameter tolerance: ±2.0mm; ②Wall thickness tolerance: ±1.45mm; ③No visible defects on the surface.

[0039] The extrusion method of the niobium tube of the present embodiment comprises the following steps in sequence:

[0040] Ⅰ Billet preparation

[0041] Using Φ277mm niobium ingot, central through hole diameter: Φ60mm, length 800mm;

[0042] Ⅱ One induction heating

[0043] 9:00 Enter the induction furnace for heating, the temperature of the first induction heating is set to 600°C, the heating power is 550kW, the soaking power is 165kW, the soaking time is 3min, and the total time is 10min;

[0044] 9:10 Out of the induction furnac...

Embodiment 2

[0065] Domestic companies' requirements for Nb pipes

[0066] (1) Material: Nb (Nb content ≥99.95%, C content ≤0.01%, N content ≤0.007%, O content ≤0.007%, Fe content ≤0.005%, Ni content ≤0.005%, Si content ≤0.010%);

[0067] (2) Specification: Φ250×20mm

[0068] (3) Length: 5m

[0069] (4) Technical requirements: ①Outer diameter tolerance: ±2.5mm; ②Wall thickness tolerance: ±2mm; ③No visible defects on the surface.

[0070] The extrusion method of the niobium tube of the present embodiment comprises the following steps in sequence:

[0071] Ⅰ Billet preparation

[0072] Using Φ383mm niobium ingot, central through hole diameter: Φ60mm, length 800mm;

[0073] Ⅱ One induction heating

[0074] 12:00 Enter the induction furnace for heating, the temperature of the first induction heating is set to 600°C, the heating power is 630kW, the soaking power is 195kW, the soaking time is 3min, and the total time is 10min.

[0075] 12:10 Out of the induction furnace, the outer surfa...

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Abstract

The invention discloses an extrusion method of a niobium tube. The production method comprises the following steps: preparing a tube blank, performing primary power frequency induction heating at 600+ / -10 DEG C, lubricating through glass dust, performing secondary power frequency induction heating at 1150+ / -10 DEG C, reaming (wherein the percentage reduction of area is not more than 20.0%), performing third power frequency induction heating at 1200+ / -10 DEG C, extruding with small deformation (wherein the extrusion rate is not more than 10, and the percentage reduction of area is not more than 90%) and air cooling, thereby finishing the heat extrusion process of the niobium tube. The niobium seamless tube produced by the method disclosed by the invention is capable of guaranteeing enough hot-working plasticity, the adverse factor caused by poor mobility of niobium is avoided by the small-deformation extruding method, and the performance and the size meet the demand of users.

Description

technical field [0001] The invention relates to an extrusion method of a niobium tube. Background technique [0002] Niobium tubes are widely used in ion sputtering, but the production of niobium tubes as targets has always been a bottleneck limiting this technology. [0003] The melting point of niobium is as high as 2468°C. It has high resistance to thermal deformation at high temperature and is difficult to form by thermal processing. The usual thermal processing temperature is above 1300°C. However, niobium will be violently oxidized in air above 600°C, so the processing of niobium tubes has always been a difficult problem in the world. At present, domestic products are mainly imported and used. There is no domestic production case for direct extrusion of niobium ingots into seamless pipes. Contents of the invention [0004] In order to prevent product failure due to surface oxidation caused by high temperature during thermal processing, the invention provides an ext...

Claims

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Application Information

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IPC IPC(8): B21C23/08B21C29/00
Inventor 聂飞康喜唐拓雷锋范晔峰李鹏付俊生张琳张晓侯楠梁祥祥
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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