Titanium and titanium alloy multi-head spiral tube processing method
A processing method, titanium alloy technology, applied in the processing field of metal pipes, can solve the problems of high processing technology requirements, high processing costs, and difficulties, and achieve the effects of large heat transfer area, improved processing performance, and improved service life
Inactive Publication Date: 2012-02-08
江阴市钛业制管有限公司
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Problems solved by technology
[0012] However, the processing of titanium and titanium alloy tubes into spiral tubes has not been reported because of the difficulties of high processing technology requirements and high processing costs.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] 1. Cold processing of titanium and titanium alloy materials into light pipes:
[0024] 1), the TB2 alloy ingot with a diameter of 380 mm for vacuum secondary smelting is billet-forged and hot-rolled to obtain a TB2 rolled rod;
[0025] 2), the TB2 rolled bar is machined into Light rods, heated to 720°C-800°C, vacuum heat-treated and kept warm for 30-120min, cooled to room temperature and cold-extruded on an extruder to obtain a tube blank with an outer diameter of 85-88mm;
[0026] 3) Carry out internal and external polishing of the tube blank, pickling to remove the scale on the inner and outer surfaces of the tube blank;
[0027] 4), carry out four finishing rolling:
[0028] a. After one pass of billet cold rolling on LG60 cold rolling mill, the intermediate annealing temperature is 450-500 °C;
[0029] b. On the LG50 cold-rolling mill, go through the second pass of billet cold-rolling, and the intermediate annealing temperature is 350-400°C;
[0030] c. After t...
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Abstract
The invention discloses a method for processing titanium and titanium alloy multi-start helical tubes, which comprises the following steps: 1) carrying out cold machining on titanium and titanium alloy materials to produce light tubes, namely carrying out vacuum heat treatment on the titanium and titanium alloy materials for 0.5 to 2 hours at the temperature of between 720 and 800 DEG C, then cooling the titanium and titanium alloy materials to room temperature, and carrying out finish rolling on the titanium and titanium alloy materials at the temperature of between 300 and 400 DEG C to obtain the light tubes; 2) processing the titanium and titanium alloy light tubes into multi-start helical tubes, namely carrying out vacuum heat treatment and internal annealing on the rolled light tubes for 0.5 to 1 hour for relieving stress at the temperature of between 300 and 400 DEG C, then extruding the light tubes to produce titanium and titanium alloy multi-start helical tubes by using a multi-start cold extrusion press. By adopting a vacuum heat treatment process, the method reduces the hardness of the titanium and titanium alloy materials, improves the toughness thereof, changes the organizational structure thereof and refines the grain size to improve the processability of the titanium and titanium alloy materials; meanwhile, the produced coiled tube has the advantages of large heat transfer area, high heat transmission effectiveness, difficult residue sediment, high decay resistance and the like.
Description
technical field [0001] The invention relates to a processing method of a metal pipe, in particular to a processing method of a multi-head spiral pipe of titanium and titanium alloy. Background technique [0002] Over the past 30 years of reform and opening up, China's titanium and titanium alloy plates, tubes, rods, wires and forgings (rings, cake blanks) markets have grown from scratch, from small to large, from rapid expansion of the total volume to obvious upgrades in structure, and gradually formed an effective market. A diversified and multi-level consumer market with Chinese characteristics. [0003] The market scale of titanium and titanium alloy plates, tubes, rods, wires and forgings (rings, cake blanks) has expanded several times or even dozens of times compared with the initial stage of reform, and its development achievements have attracted worldwide attention. [0004] Generally, titanium has good corrosion resistance in oxidizing and neutral media, and has bet...
Claims
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IPC IPC(8): C22F1/16C21D9/08B21C23/02B21C37/15
CPCY02P10/20
Inventor 黄钢
Owner 江阴市钛业制管有限公司