Titanium Seamless Tube
Titanium material using application areas
Immersion anode(Ti/Cu,Zr/Cu,Stainless steel /Cu...) advantages
The performance of stainless steel
The performance of Titanium
Titanium Screws & Nuts
The performance of the non-ferrous metals nickel, tantalum, niobium and uses
Application of Titanium Cathode Plate in electrolytic and hydrometallurgical industry.
Titanium Seamless Tube

Titanium Seamless Tube

What are the characteristics of titanium seamless tube?

Compared with other metal materials, titanium alloy  seamless tube has the following advantages :1.High specific strength (tensile strength/density) (see figure). The tensile strength can reach 100 ~ 140kgf/mm2, and the density is only 60% of steel.2.The medium temperature strength is good, the use temperature is several hundred degrees higher than the aluminum alloy, at medium temperature can still maintain the required strength, can work at 450 ~ 500℃ temperature for a long time.3. good corrosion resistance, the surface of titanium in the atmosphere immediately formed a uniform and dense oxide film, has the ability to resist the erosion of a variety of media.In general, titanium has good corrosion resistance in oxidizing and neutral media, especially in seawater, wet chlorine and chloride solutions.However, the corrosion resistance of titanium is poor in reducing media, such as hydrochloric acid and other solutions.  4. Titanium alloys with good low temperature performance and very low interstitial elements, such as TA7, can maintain a certain plasticity at -253℃. 5. low elastic modulus, small thermal conductivity, no ferromagnetism.钛无缝管

What are the rolling methods and matters needing attention of titanium seamless pipe?

the rolling of titanium seamless pipe in general is processed by reciprocating cold rolling mill (i.e., peel format). In the processing process, the two-roll (LG) and multi-roll (LD) mills are generally used for multi-pass rolling.In the process of deformation, with the rolling mill rotation and feed, gradually reduce the wall, reduce the diameter, the unit length of the pipe in a rolling path generally through 5~10 times of rolling, finishing to obtain the process requirements of the size of the pipe.Cold rolling mill can carry out large diameter reduction and wall reduction processing, but after rolling, the size accuracy is low, the pipe end is prone to cracking, uneven, and other phenomena, for cracking phenomenon, mainly through the tube processing before grinding, leveling and other methods can be solved;For the appearance of the tube end is not neat, similar to the "fish mouth" phenomenon, in the subsequent processing process needs to be flat head treatment, otherwise it will cause plug stuffy car accident, therefore, this paper from the process, mold, equipment and other aspects of analysis, in order to find out the cause of the tube end uneven reasons, take effective measures to solve.The large spline gap at the connection between the core bar and the core bar trolley and the serious displacement of the mandrel are the main reasons for the uneven end of the tube after the billet rolling.When the pure titanium pipe is rolled in the blank, it usually needs to be finished many times in a pass. After rolling into the required titanium pipe specifications, the end of the pipe will generally have a slight fluctuation of 1~2mm.This batch of titanium tube in terms of raw materials and process before and there was no difference in the production of pipes, but more severe bump fluctuations, length is 70 mm, 1% of the pipe length, from the outer diameter and wall thickness test results before and after processing, sample thickness fluctuation is bigger, convex parts measurement data average wall thickness of 2.33 mm, concave position measurement data average wall thickness of 2.60 mm, both reached 0.27 mm wall thickness difference, the normal after rolling of titanium pipe wall thickness deviation is 0.05 ~ 0.10 mm, wall thickness deviation will cause different elongation coefficient,It can be said that the unevenness of the wall loss during the end tube rolling is the direct cause of the unevenness of the end tube.The uneven wall thickness caused by the mold has the factors such as the installation of gear and rack, the mold alignment, the mold opening degree and so on.After the measurement, the gap between the upper and lower mold holes is 0.05.;The gap between the hole type and the gap between the gear and the rack is about 1.6mm.The rack is fixed on the rack without looseness and the positioning block is not deformed.Hole left and right dislocation cut.02mm, zero line alignment.The above measurement data shows that the installation of the mold is within the range of design requirements.The uneven wall thickness caused by the equipment has some reasons, such as feed amount, rotation Angle, coordination of movement, etc.The rolling speed and feed amount shall be executed according to the process requirements. During the operation of the equipment, the backward dead point shall be rotated and fed, and the forward dead point shall be rotated and fed. The movement shall be coordinated.Within the scope of equipment design requirements;Continue to measure the rolling amount sent to, found that sent the amount evenly, but found that titanium pipe when sent to, and core tube billet coaxial rod before and after the shot motion is bigger, to 10 mm, before and after a core rod during rolling in accordance with the requirements of the momentum should not be greater than 0.5 mm, otherwise it will seriously affect the accuracy of rolling of mandrel position, further examination found that the junction between the core and core rod car is spline clearance 20 mm, more than 8 mm clearance requirements.When the titanium pipe is sent into the back dead center, the gap between spline and core rod is too large, which inevitably leads to the core rod is also moving forward when the titanium pipe billet is moving forward. In this way, the position of the mandrel connected with the core rod during rolling changes greatly, that is, the position of the mandrel and hole is no longer the position set by the process, but the position of the mandrel is moving forward.In this way, when rolled to the front dead center, the pipe is actually rolled to a thinner size;But while core rod followed the tube billet, spline front end of the spring force, at this point has been when pass to top dead center, pipe inner hole and release of the plug, the spring push after the core rod, the mandrel is back, this time pass rolling of titanium tubes after the side wall thickness thicker parts on the whole, but due to the backward core rod, the all the wall thickness of the thicker part but not all the whole, then caused the wall thickness of the larger difference.After adjusting the spline clearance at the connection between the core rod and the core rod trolley, the unevenness of the tube end was found to disappear.

What advantages does titanium seamless tube have that can be applied?

Titanium tube is light in weight, high in strength and superior in mechanical properties.It is widely used in heat exchange equipment, such as tube heat exchanger, coil heat exchanger, coil heat exchanger, condenser, evaporator and pipeline.At present, many nuclear power industry titanium tube as the unit standard.Titanium tubes according to the use requirements and performance of the different implementation of two national standards: ASTM B338 ASTM B861Supply brands:TA1, TA2, TA9,  Gr1, Gr2Supply specification: diameter 4~114mm wall thickness 0.2~4.5mm length within 15mSeamless titanium tube is made by extrusion process, and welded titanium tube is made by plate crimping.Generally seamless titanium tube wall thickness is relatively small, the diameter is also relatively small.1. Seamless titanium tube, titanium tube.High strength.Titanium alloy has very high strength, its tensile strength is 686-1176mpa, and the density is only about 60% of steel, so the specific strength is very high.2. Seamless titanium tube has high hardness.The hardness HRC of titanium alloy (annealed) is 32 -- 38.3. Low elastic modulus of seamless titanium tube.The elastic modulus of titanium alloy (annealed) is 1.078×10-1.176×10MPa, about half that of steel and stainless steel.Standard: ASTM B337, ASTM B338, ASTM B338 B8614. Excellent performance at high and low temperature.Seamless titanium tube in high temperature, titanium alloy can still maintain good mechanical properties, its heat resistance is much higher than aluminum alloy, and the working temperature range is wider, the current new heat resistant titanium alloy operating temperature up to 550-600 ℃;At low temperature, the strength of titanium alloy is higher than that at normal temperature, and it has good toughness. At low temperature, titanium alloy can maintain good toughness at -253℃.5. Seamless titanium tube has strong corrosion resistance.Titanium in the air below 550℃, the surface will quickly form thin and dense titanium oxide film, so in the atmosphere, seawater, nitric acid and sulfuric acid and other oxidizing medium and strong alkali, its corrosion resistance is better than most stainless steel.