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.
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[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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