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Preparation method for niobium alloy thin walled tube of corrugated pipe

A technology of niobium alloy and thin-walled pipes, which is applied in the field of preparation of refractory material pipes, can solve problems such as corrugated pipes that cannot be satisfied, and achieve the effects of suitable promotion and application, short production process, and expanded use range

Active Publication Date: 2019-01-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the limit wall thickness of niobium alloy thin-walled pipes that can be processed by pipe rolling is 0.2mm, but for thinner niobium alloy pipes, the air-drawing method is usually used, but the wall thickness accuracy of the pipes obtained by air-drawing method is only ± 0.02mm, unable to meet the needs of higher precision pipes for corrugated pipes

Method used

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  • Preparation method for niobium alloy thin walled tube of corrugated pipe
  • Preparation method for niobium alloy thin walled tube of corrugated pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the present embodiment comprises the following steps:

[0024] Step 1. Cut the fully recrystallized niobium alloy pipe to length to 40 mm, then polish the nozzle of the cut niobium alloy pipe smoothly, and clean the inner and outer surfaces; the completely recrystallized niobium alloy pipe The outer diameter is 35.8mm±0.05mm, the wall thickness is 1.0mm±0.08mm, and the surface roughness Ra≤1.6μm; the fully recrystallized niobium alloy pipe refers to the niobium alloy pipe that has been annealed to a completely recrystallized state after rolling. Seamed niobium alloy pipe, the composition of the seamless niobium alloy pipe is Nb-5W-2Mo-1Zr;

[0025] Step 2: Put balls with a diameter of 5 mm into the mold of the ball spinning equipment and apply 20 # machine oil, and then the ball spinning equipment is debugged; in the debugging process, the longitudinal feed speed of the ball spinning equipment is 10mm / min, and the spindle speed is 800 revoluti...

Embodiment 2

[0029] The preparation method of the present embodiment comprises the following steps:

[0030] Step 1. Cut the fully recrystallized niobium alloy pipe to length to 75 mm, then polish the nozzle of the cut niobium alloy pipe smoothly, and clean the inner and outer surfaces; the completely recrystallized niobium alloy pipe The outer diameter is 12.8mm±0.05mm, the wall thickness is 0.44mm±0.02mm, and the surface roughness Ra≤1.6μm; the fully recrystallized niobium alloy pipe refers to the niobium alloy pipe that has been annealed to a completely recrystallized state after rolling. Seamed niobium alloy pipe, the composition of the seamless niobium alloy pipe is Nb-5W-2Mo-1Zr;

[0031] Step 2: Put balls with a diameter of 3.5 mm into the mold of the ball spinning equipment and apply 20 # machine oil, and then the ball spinning equipment is debugged; in the debugging process, the longitudinal feed speed of the ball spinning equipment is 17mm / min, and the spindle speed is 950 revol...

Embodiment 3

[0036] The preparation method of the present embodiment comprises the following steps:

[0037] Step 1. Cutting the fully recrystallized niobium alloy pipe to a length of 70 mm, then grinding the nozzle of the cut niobium alloy pipe smoothly, and cleaning the inner and outer surfaces; the completely recrystallized niobium alloy pipe is The outer diameter is 21mm±0.05mm, the wall thickness is 0.56mm±0.03mm, and the surface roughness Ra≤1.6μm; the fully recrystallized niobium alloy pipe refers to the seamless tube that has been annealed to a completely recrystallized state after rolling. Niobium alloy pipe, the composition of the seamless niobium alloy pipe is Nb-5W-2Mo-1Zr;

[0038] Step 2: Put a ball with a diameter of 3mm into the mold of the ball spinning equipment and apply 20% to the surface of the core rod of the ball spinning equipment # machine oil, and then the ball spinning equipment is debugged; in the debugging process, the longitudinal feed speed of the ball spinn...

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Abstract

The invention discloses a preparation method for a niobium alloy thin walled tube of a corrugated pipe. The preparation method comprises the following steps: 1) sizing and cutting a fully re-crystallized niobium alloy tube stock and then polishing and cleaning; 2) putting balls into a ball spinning device, coating a lubricant on the surface of a core bar of the ball spinning device and debugging the ball spinning device; 3) assembling the cleaned niobium alloy tube stock on the core bar of the ball spinning device after debugging, spinning and molding, thereby acquiring a semi-finished productof niobium alloy thin walled tube; 4) treating the semi-finished product of niobium alloy thin walled tube in the manner of washing with alkali, removing oil, washing with water and air-drying, and then performing full re-crystallization annealing, thereby acquiring the niobium alloy thin walled tube. According to the invention, the niobium alloy thin walled tube with high size precision, high surface quality and high plasticity is acquired by strictly controlling the processing state, size and roughness of the raw material niobium alloy tube stock and selecting proper ball spinning processing parameters. The niobium alloy thin walled tube meets the use requirement of the corrugated pipe for tube stock.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory material pipes, and in particular relates to a preparation method of niobium alloy thin-walled pipes for corrugated pipes. Background technique [0002] Metal bellows have good axial, radial and circumferential deformation capabilities, can bear high-cycle reciprocating loads, and have high fatigue life, and are widely used in aerospace, electrical instrumentation, nuclear energy, petrochemical, automobile and ship industries. Niobium alloy can maintain high strength at high temperature, has excellent welding performance and corrosion resistance, and has good room temperature processability and room temperature mechanical properties. It is one of the preferred materials for the preparation of metal bellows elastic components in harsh environments . However, niobium alloys have high strength at room temperature and poorer plasticity than conventional corrugated pipe material stee...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21D22/16
CPCB21C37/06B21D22/16
Inventor 夏明星郑欣蔡小梅王峰白润刘辉薛建嵘
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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