Pure Titanium Tube

 The pure titanium seamless tube customization  is a service provided by Shenghui for buyers, and the pure titanium tube is customized according to the requirements of use.

Performance and performance differences can be implemented in accordance with American standards: ASTM B337, ASTM B338

Material: Gr1, Gr2, Gr5, Gr9, Gr12, Gr16

Standard: ASTM B337 ASTM B338 ASME SB337 ASME SB338

                  ASTM B861 ASTM B862

Size: outer diameter * wall thickness * length (10-200) * (0.5-10) * (100-15000)

Customization, special specifications can also be produced according to drawings and samples

With our professional service attitude, we have strict inspections for every process to ensure that every product is qualified.

Titanium alloy pipe welding is usually on-site all-position welding, which is much more difficult than stainless steel pipe welding. The weld area of titanium and its alloy above 400 ℃ must be protected, because its chemical properties are particularly active and it is easy to absorb harmful gases. , Resulting in a decrease in material performance and even cracks. Therefore, pay special attention to the following matters when welding:

When welding titanium and its alloy pipelines, the selection of welding materials is basically based on the principle of equal strength. When no suitable welding materials are found, the method of cutting from the base material can be used to solve the problem; the selection of argon will directly affect the weld. Its hardness and toughness also have a significant impact on the generation of welding cracks, so it is required to select (especially pure titanium) high-purity argon (99.99%).

The cutting and breaking of the titanium tube should be made by cold working methods, and it should not be overheated and discolored. Use a grinding wheel or a stainless steel wire wheel to polish the metal luster within the range of not less than 20mm on the inner and outer surfaces of the groove. Use a scraper to trim the burr of the groove and then polish it smoothly to avoid hanging cloth wire during cleaning.

The quality of cleaning directly affects the generation of welding cracks and pores. Usually pickling (3%HF+35%HNO3+H2O) is used first, then rinsed with water, and finally dried, and wiped with acetone or alcohol before welding. The welded joints after cleaning must be welded immediately, no more than 4h, otherwise they need to be cleaned again. Rubber gloves should not be used when cleaning, but white cotton gloves should be used.

The protection of the welding area when welding titanium alloy pipes is very important. It is similar to stainless steel pipe welding, but the gas protection requirements are more stringent. The argon filling in the pipe must continue until the end of the welding. The outer front argon protection uses a large-diameter nozzle and an extended drag hood. In order to improve the protection effect, when the welding is over, the drag hood is not over. You must wait for the temperature to drop below 200 ℃ to stop the air supply and remove the drag hood.

Welding operation mainly pay attention to the following points:

Allow a period of time for replacement before welding. Open flame detection can be used to inspect the weld. After confirming that the gas in the pipe is completely argon, the welding can be carried out. It adopts short arc welding and does not swing the welding gun and welding wire. When covering the surface, it is to swing, but also only slightly and slowly. The end of the welding wire must not leave the protection range during the welding process, otherwise the end of the welding wire will be oxidized. If the end of the welding wire is found to be oxidized, the oxidized part must be cut off before use. After the welding is stopped, the air supply shall be delayed until the temperature of the welding zone drops below 300°C.

When feeding the wire, it is not possible to quickly feed the welding wire one by one and draw the filler wire. The welding wire should be fed slowly and evenly into the molten pool, otherwise it will cause gas turbulence and affect the protection effect. The distance between the nozzle and the nozzle during welding is as low as possible without affecting the line of sight. The angle is about 75°, but the tungsten electrode cannot collide with the base material to cause tungsten clamping; the angle between the welding wire and the nozzle is 12 °About. During the welding process, the temperature between layers must be strictly controlled. The first layer in the United States and South Korea must wait until the temperature drops to room temperature before continuing to weld the next layer. There should be a gap of 0.5-1mm between the rubber sealing plate and the inner diameter of the pipe, which can play a role in replacing the air in the pipe before welding, releasing excess argon gas and cooling during the welding process. When welding, always observe the surface color of the weld. Silver-white is the best, followed by golden, purple, blue, gray, and gray.

The welding environment is very important. The welding site must be kept dry and clean. The ambient temperature during welding should be controlled above 18°; there is no draught in the welding area, and the welding pool and heat-affected zone are absolutely forbidden to penetrate water, water vapor or other gases, otherwise it must be There must be shielding measures to prevent the welding seam from being contaminated and affecting the welding quality. In short, it is important to weld titanium and its alloy pipelines, from the selection of welding consumables, beveling and grinding, cleaning and drying, environmental measures, gas protection, process parameters, and welding operations. Produce qualified welded joints.

Pure titanium seamless tube customization processing process:

Starting from the tube billet, one is cross-rolling piercing (poor stability, but strong plasticity) and the other is extrusion (good mechanical properties). Of course, our company chooses the tube billet to start rolling from the road:

  1. Manual grinding (treat small defects on the surface of the tube blank)

  2. Billet rolling (uneven tolerance, rolling into the same core "inner diameter" and the same diameter "outer diameter")

  3. Degreasing and pickling (wash and see if there are still defects on the surface)

  4. Intermediate annealing (stress relief)

  5. Continue rolling to the required specifications (two rough rolling-two high rolling mill, one finishing rolling-three high rolling mill, so as to well control tolerances)

Note: Degreasing and pickling are carried out for each rolling pass

After finishing rolling, the surface of the pipe after degreasing and pickling is very beautiful → vacuum annealing (annealing temperature depends on the selected material, annealing for 16h)

Next, straightening (within the tolerance range) → cutting (according to the required length) → water pressure (test for leakage) → post-rinsing (small pollution in various processes) → finished product inspection → packaging → delivery

Titanium tubes and titanium alloy tubes are mainly used to deal with chlorine-containing solutions, such as sea water and wet chlorine, forming an oxide film to resist corrosion. Titanium materials are used to deal with HCL, chlorine-containing solutions, sea water and other occasions. It is also an indispensable material in the nuclear industry. Many equipment, pipelines and related components used in nuclear reactors also require a large amount of pure titanium tubes and titanium alloy tubes.

        1. The application of titanium tube in aerospace

Titanium tubes are used in aerospace, aviation industry manufacturing, and engineering construction also uses a large number of titanium tubes.

        2. Application of titanium tube in military industry

The military industry has a great demand for titanium tubes. Titanium tubes have a wide range of uses in the military industry, such as nuclear submarines, hydrofoil boats, mortar barrels, anti-tank missiles, missile launchers, tank shields, body armor, etc. There are many titanium tubes.

       3. Application of titanium tube in shipbuilding industry

Titanium pipes have higher corrosion resistance than other metal materials, especially resistant to high-speed erosion and corrosion of seawater. Pure titanium pipes and titanium alloy pipes are widely used in coastal power stations, offshore oil production equipment, seawater desalination, marine chemical production, and marine aquaculture.

        4. Application in petroleum refining

Internationally, the introduction of titanium equipment into these high-corrosion links in the refining and chemical industry has achieved good results.

       5. Chemical applications

According to calculations by the chemical industry department, the current application of titanium tube equipment has expanded from the initial soda ash and caustic soda industries to the entire chemical industry, and the annual usage of titanium tubes will exceed 1,500 tons. The vacuum salt production enterprise adopts titanium tube metal material manufacturing equipment to improve the service life of the equipment.

      6. Application in the automotive industry

Titanium tubes have light weight, high strength, and good wear resistance. They have been used in racing cars for many years and have been paid attention to by car manufacturers for a long time. With the development of the automobile industry, titanium tubes for automobiles are still growing rapidly.

      7. Application in medicine

Titanium is a metal that can be implanted in the human body. Due to the weak rejection reaction of titanium tube metal to human tissues, it is currently widely used in artificial bones, artificial joints, artificial teeth and so on. In addition, the future demand for titanium tubes for pharmaceutical machinery and medical equipment should not be underestimated.

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