tantalum tube grades Ta1, Ta2, TaW2.5, TaW7.5, etc. 

Pure tantalum purity greater than 99.95% annealed state (M) or hard state (Y)

Name: Tantalum tube (seamless tube)

Grades: Ta1, Ta2, TaW2.5, TaW7.5, TaW10, TaNb3, TaNb20, TaNb40, etc.;

Purity: The purity of pure tantalum is greater than 99.95%;

State: Annealed (M) or Hard (Y);

Tantalum tube manufacturing process

Tantalum cannot be processed by ordinary methods of processing ordinary metals. The general initial process is forging, processing and heat treatment, and two methods of hammering and stamping are used to make flat blanks or round small and medium-sized blanks. Unlike ordinary metals, tantalum cannot be hot worked. The recrystallization temperature of tantalum exceeds 1000~C. If heated, excessive oxidation will occur even if a general protective layer is applied. What's more serious is that if tantalum is exposed to such a high temperature, not only will excessive oxidation occur on the surface of tantalum, but oxygen can also penetrate into the atoms inside the matrix, making tantalum brittle. Not only oxygen, but even nitrogen, carbon and hydrogen can make tantalum brittle. For the above reasons, tantalum is generally not hot worked. When it is necessary to carry out thermal processing, it is necessary to do a protective covering layer or carry out in an inert gas atmosphere.

heat treatment

Since the reaction of tantalum with oxygen is active, it is necessary to avoid heat treatment in an atmosphere even in the presence of a little air. Therefore, almost all annealing is carried out in a high vacuum, and the gas tightness of the furnace must also be high. Usually, the heat treatment temperature of tantalum is generally 950~1300℃. Tantalum and commonly used tantalum alloys do not undergo phase transformation within this temperature range. The heat treatment is only used for annealing, so the heating temperature and cooling rate are not important. In order to produce complete recrystallization, the heat treatment time is slightly longer.

Commercially produced tantalum is of high purity. Grains become very large by annealing. The size of the crystallites is determined by cold working, purity, temperature and process steps. Therefore, temperature control and process control are important means to determine the size of crystals.

Unlike many other metals, tantalum must be very clean before heat treatment. If it is not cleaned very cleanly, surface contamination caused by hydrogen, oxygen, nitrogen and carbon will occur, resulting in an embrittled (hardened) structure. Because hydrogen, oxygen, nitrogen and carbon are very active intrusive elements in the temperature range of tantalum annealing, once contaminated by these elements, there is no way to remove them except remelting.

Tantalum plate manufacturing characteristics

Almost all tantalum plates are cold worked. Generally, starting from a tantalum ingot of 15-30 cm, cold forging into a slab with a thickness of about 8-10 m, and then cold rolling from this slab, the compression rate can be above 95%. In commercial production, slabs are usually rolled into 0.63-1.2 cm thick plates with two rolling mills or four rolling mills, and the width is generally 51-102 cm. Rolling is typically performed at or near room temperature to prevent oxide formation on the surface. When hot rolling is required, the temperature rises to 1000°C due to recrystallization, and a violent oxidation reaction occurs.

Almost all thick plates are heat-annealed in vacuum. Since there is no phase transformation, the rate of heating and cooling is not critical. Further rolling is carried out with an ordinary rolling mill, and at this time, a 4-rolling mill and a multi-rolling mill are generally used. Since tantalum is very soft, care should be taken to prevent scratches during processing and shipping.

Manufacturing characteristics of tantalum rods

To make the bar product, it is first forged or extruded to an intermediate moderate size, with a representative cross-sectional yield of 70%-90%, and then the material is annealed and heat treated. For further processing, forging, rolling, extrusion or drawing are usually used. The wire rod is processed by a common wire drawing machine. Since the tantalum material is very soft, it is easy to produce scratches, and the surface problem during drawing is very large. The manufacturer should pay special attention to the surface condition and lubrication. ,

Tantalum tube manufacturing characteristics

Tantalum can be used to make welded and seamless pipes and has a wide range of uses. The manufacture of seamless pipes is by extrusion, pipe reduction or deep drawing from sheet metal. The welding method is to form strips first, then make them into tubes, and then weld the seams with gas tungsten arc (GTAW).