TU 95 2799-2002. Tantalum ingots.
Are you interested in TU 95 2799-2002? We offer to buy tantalum ingot from specialized warehouses of the supplier Evek GmbH with delivery to any city. Full compliance with modern quality standards. Supplier Evek GmbH offers to buy rare-earth metals, the price is optimal in this segment of rolled metal products.
Range of tantalum ingots
| Tantalum ingots under TU 95 2799-2002 are available in diameter of 60-130 mm and length up to 750 mm. They are supplied with machined or electron beam melted surface. Mass fraction of tantalum is not less than 99,8%. Mass fraction of impurities shall not exceed the values stated in the table: | ||||
| Nb (niobium) 0,05 | O (oxygen) 0,01 | Na (sodium) 0,0002 | Mn (manganese) 0.0001 | Sn (tin) 0.0001 |
| Fe (iron) 0.0015 | N (nitrogen) 0.01 | Mg (magnesium) 0.0002 | Co (cobalt) 0.0001 | Cr (chromium) 0.0005 |
| Ti (titanium) 0.0005 | C (carbon) 0.005 | Al (aluminum) 0.0005 | Ni (nickel) 0.0003 | Zr (zirconium) 0.0005 |
| Si (silicon) 0.0015 | H (hydrogen) 0.0005 | Ca (calcium) 0.001 | Cu (copper) 0.0005 | W (tungsten) 0.01 |
Evek GmbH offers a wide range of tantalum ingots based on TU 95 2799-2002 standard at favorable economic prices from the manufacturer. The supplier provides prompt delivery to any location specified by the customer.
Processing technology
The ductility of tantalum ingots during pressure processing is affected by the content of introductions (oxygen, nitrogen, carbon). Tantalum ingots, with the exception of ingots with extremely low content of interstitial impurities, are brittle at low temperatures. Therefore, tantalum ingot production technology includes destruction of the cast structure by forging or pressing. After breaking the cast structure, the hot-deformed material is deburred to remove oxygen-enriched surface layers, annealed under vacuum to obtainrecrystallized structure, and then processed in the cold state to the required size by any deformation method (if necessary, with the introduction of intermediate annealing). The content of oxygen in the finished product is within 0,01...0,08%, nitrogen - 0,01...0,04%, carbon - 0,01...0,05%.
Difficulties
It is possible to process ingots with somewhat high content of introduction admixtures; however, difficulties arise due to material cracking during hot deformation and subsequent cold deformation; besides, frequent intermediate annealing is required for cold deformation. Tantalum ingots with very low content of intermediate elements can be successfully coldworked directly in the cast state (i.e. without cracking).
Heating
The ingots can be heated up to the forging temperature in air before hot work, but only with fast heating, because the continuous heating to the hot deformation temperature (about 1200°C) results in oxygen diffusion and increases the brittleness of the metal. Heating of tantalum ingots in an argon atmosphere has been successfully used for forging under hammer and press and crimping in the temperature range of 650 to 1200 °C. It is also possible to heat tantalum ingots in a reducing atmosphere, but with caution since tantalum in a hydrogen atmosphere turns into a hydride during slow cooling from 1100 °C. In this case, tantalum can be heated in a hydrogen atmosphere above the temperature range of hydride formation, then machined in air.
Deburring
One way to reduce forging cracking is to grind the head and the bottom of the ingot before forging so that their surfaces become parallel. Another method is to use a bottom striker with a V-shaped notch, on which the ingot is placed to ensure that a triaxial stress state is created during forging.
Buy. Supplier, price.
Are you interested in TU 95 2799-2002? We offer to buy tantalum ingot, the price is determined by the technological features of production without including additional costs. The website of Evek GmbH displays information about the latest arrivals of products. It is possible to order rolled products of any metal. We invite to partner cooperation.
