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Refractory and rare noble metal pipe and preparation method thereof

A technology for rare and precious metals and pipes, applied in the field of material processing, can solve problems such as low processing costs, and achieve the effects of improving overall strength, preventing failure, and preventing easy cracking and failure.

Active Publication Date: 2021-11-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a refractory and rare metal pipe and its preparation method, by butt jointing the refractory rare metal plate according to the method of folding in half or spirally, adopting laser / electron beam oblique welding, heat treatment The refractory rare and expensive finished pipe is obtained. This method has less waste, low processing cost, avoids cracking in processing and deformation in subsequent processing, has excellent tensile strength and elongation, and improves the yield of finished products.

Method used

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  • Refractory and rare noble metal pipe and preparation method thereof
  • Refractory and rare noble metal pipe and preparation method thereof

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preparation example Construction

[0040] A method for preparing a refractory and rare metal pipe provided in an embodiment of the present invention includes:

[0041] 1) material selection

[0042] Calculate and select the plate thickness according to the length and millimeter-level thickness requirements of the finished pipe, among which the inner diameter D of the finished pipe, the thickness H of the selected plate, and the thickness h of the finished pipe should satisfy the following relationship: 50H≤D≤15H, and h≤ 0.8H; select the plate that has been annealed.

[0043] 2) Bending processing and welding

[0044]Choose different bending methods according to the calculated blank length and the length and width of the plate, and carry out machining. The bending method is divided into two types: for the plate whose length is not greater than 5m, you can choose the half-folding method, where the half-folding angle is 30-60°; For plates with a pipe length ≥ 5m, it is necessary to choose a spiral bending method...

Embodiment 1

[0054] Choose a 2mm thick molybdenum-lanthanum alloy to bend and weld the pipe to form it.

[0055] Step 1, prepare a molybdenum-lanthanum tube with a tube length of 1.5m, a diameter of 6cm and a thickness of 2mm, select a molybdenum-lanthanum alloy plate with a thickness of 3.5mm, and select the plate in an annealed state;

[0056] Step 2, choose a molybdenum-lanthanum alloy plate with a length of 1m and a width of 18cm to butt the two long sides along the tube axis at 30°, and perform laser and electron beam welding on the butt joint surface to form a welded seamless tube blank;

[0057] Step 3, shaping the welded seamless tube blank or seamless tube, simply grinding the weld seam, and annealing the welded seamless tube blank at 800°C for 40 minutes to eliminate the stress concentration in the weld seam;

[0058] Step 4: Roll the welded seamless pipe blank at 950°C after heat treatment, the initial rolling temperature should be increased by 60°C within the set temperature ra...

Embodiment 2

[0063] Select 0.8mm thick molybdenum-lanthanum alloy to bend and weld pipes for forming.

[0064] Step 1, preparing a molybdenum-lanthanum tube with a tube length of 1.2m, a diameter of 4cm, and a thickness of 0.8mm, selecting a molybdenum-lanthanum alloy plate with a thickness of 1.5mm, and selecting the plate in an annealed state;

[0065] Step 2, choose a molybdenum-lanthanum alloy plate with a length of 1m and a width of 12cm to butt the two long sides along the tube axis at 45°, and perform laser welding on the butt joint surfaces to form a welded seamless tube blank;

[0066] Step 3, shaping the welded seamless tube blank or seamless tube, simply grinding the weld seam, and annealing the welded seamless tube blank at 900°C for 20 minutes to eliminate the stress concentration in the weld seam;

[0067] Step 4, rolling the welded seamless tube blank prepared in step 3 at 950°C. The initial rolling temperature should be increased by 50°C, the rolling deformation should be ...

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Abstract

The invention discloses a refractory and rare noble metal pipe and a preparation method thereof. The preparation method comprises the following steps that a rare noble metal plate which is subjected to annealing treatment and has a millimeter-level thickness is selected; different bending methods are selected according to the sizes of different rare noble metal blanks and plates, laser and / or electron beam welding is conducted on the butt joint faces, and a welded seamless pipe blank is formed; shaping, weld joint polishing and heat treatment are conducted; then the welded seamless pipe blank is subjected to pipe rolling; and acid-alkali washing is carried out on the rolled pipe. According to the refractory and rare noble metal pipe prepared through the method, the yield can be obviously increased, good tensile strength and ductility are achieved, the yield is increased by 30% or above, the utilization rate of refractory rare noble metal raw materials can be increased, and the method has wide application prospects.

Description

technical field [0001] The invention belongs to the field of material processing, and relates to a refractory and rare metal pipe and a preparation method thereof. Background technique [0002] In recent years, the demand for refractory and rare metal pipes has increased year by year, and the main processing method is pipe rolling. The tube rolling method needs to take a tube blank of a specific size as a raw material, and axially roll it into shape. For refractory metal materials, it is generally prepared by powder metallurgy. Because of the poor properties, it is necessary to strengthen and improve the material properties through pressure processing and large deformation, and finally prepare tube blanks or thick-walled tubes by mechanical perforation; for rare and precious metal materials, it can be used by melting and casting. Prepare rods, and then prepare tube blanks or thick-walled tubes by mechanical piercing. Due to the huge waste of perforated materials and the hi...

Claims

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Application Information

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IPC IPC(8): B21C37/08
CPCB21C37/08
Inventor 孙院军孙博宇孙紫昂丁向东孙军曾毅李金阳柏小丹宋坤朋陈灿
Owner XI AN JIAOTONG UNIV
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