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

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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 be

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

Examples

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Example Embodiment

[0040] A method of preparing a refractory and a rare metal tube according to an embodiment of the present invention, including:

[0041] 1) Select

[0042] According to the length and millimeter thickness requirements of the finished pipe pipe, the thickness of the sheet is calculated, wherein the finished tube pipe is diameter D. The thickness of the selected sheet and the finished tube thickness h should satisfy the following relationship: 50H ≤ D ≤ 15h, and h ≤ 0.8h; Select the sheet of annealing process.

[0043] 2) Bending and welding

[0044]According to different lengths and the blank sheet folded length and width dimensions selected calculation method, machining, bending method, divided into two types: tube for a length greater than 5m sheet, may be selected for a method of folding, in which the folding angle 30-60 °; ≥5m sheet for pipe length, the need to select a helical folding method, by increasing the length of the billet multiple helix, but the number of turns C and ...

Example Embodiment

[0053] Example 1

[0054] Select 2mm thick moly alloy bent tube forming weld.

[0055] Step 1. Preparation of pipe length 1.5m, having a diameter of 6cm and a thickness of 2mm moly tubes, the thickness of moly alloy sheet of 3.5mm, annealed sheet selection;

[0056] Step 2, the choice of length 1m 18cm wide moly alloy sheet of the two long sides 30 ° tube axial abutment, abutment surfaces of the laser and electron beam welding to form welded seamless tube blank;

[0057] Step 3, a seamless or welded seamless parison shaping, simply grinding the weld, and welded seamless parison incubated at 800 ℃ 40min annealing, to eliminate the stress concentration at the welded seam memory;

[0058] Step 4, welded seamless preform after heat treatment at 950 deg.] C tube rolling, the initial rolling temperature 60 deg.] C to increase the set temperature in the range, to control the rolling reduction of 15%, the rolling speed reduced to 0.30m / min, re-rolling reduction rate and the successively...

Example Embodiment

[0062] Example 2

[0063] Selecting 0.8mm thick moly alloy bent tube forming weld.

[0064] Step 1. Preparation of 4cm in diameter and tube length 1.2m 0.8mm thickness moly tubes, the selected thickness of 1.5mm moly alloy plate, sheet selection annealed;

[0065] Step 2, the choice of length 1m 12cm wide moly alloy plate two long sides butted pipe axis 45 °, for laser welding abutting surfaces to form a welded seamless tube blank;

[0066] Step 3, a seamless or welded seamless parison shaping, simply grinding the weld, and welded seamless billet annealing at 900 ℃ incubated 20min, to eliminate the stress concentration at the welded seam memory;

[0067] Step 4, Step 3 Preparation of welding seamless tube billet rolling at 950 ℃. To improve the initial rolling temperature 50 ℃, control the rolling reduction to 10%, to reduce the rolling speed 0.30m / min, and the rolling reduction rate sequentially decreases again; the contrary, in accordance seamless process.

[0068] Step 5, a h...

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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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