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Tantalum hollow cylinder or tantalum alloy hollow cylinder or tantalum hollow cylinder is available with many diameters from 0.250" to 20" and many lengths from 1.5" to 4",

Chemical composition conforms to ASTM B365 R05200.
Typical size: 153mm outside diameter x 7.5mm wall thicknessx 41mm high; 
6.75" OD x 3.875" ID x 5.25" LG(171.45 OD x 98.425mm ID x 133.35mm)
11.463" OD x 8" ID x 1.7315" WT x 1.54" LG(291.16mm OD x 203.2mm ID x 43.98 x 39.11mm)
12.75" OD x 8" ID x 2.375" WT x 4.965" LG (323.85mm OD x 203.2mm ID x 60.33 x 126.11mm) 
480mm outside diameter x 15mm wall thickness x 20mm high;

Application: Hollow tantalum cylinder is involved for a new method of producing x-rays, in which rotating an x-ray source target,  the x-ray source target comprising a plurality of notches; directing individual electron beams from an electron source onto high density films(the high density films comprise tungsten, tungsten alloy, molybdenum, tantalum or rhenium) located in each of the notches to generate x-rays in the x-ray source target (wherein the x-ray source target comprises a hollow cylinder with a central axis substantially coinciding with a rotational axis of the x-ray source target, and the electron source is located inside the hollow cylinder) while the x-ray source target is rotating; and transmitting the x-rays through the x-ray source target to an x-ray window.

Trade name: Hollow tantalum cylinder, tantalum hollow cylinder, tantalum alloy hollow cylinder, tantalum hollow cylinder, tantalum hollow pipe, tantalum hollow tubing for ball, tantalum hollow cylinder for seats, tantalum part, tantalum ball valves, tantalum ball valve, tantalum valve, etc.,

Standard Specification ASTM B 521 -98 for Tantalum Tube + Tantalum Alloy Tube Seamless and Welded.This specification covers tantalum and tantalum alloy seamless and welded tubes of the following grades:
1. ASTM B 521 -98 UNS R05200, unalloyed tantalum, vacuum melt;
2. ASTM B 521 -98 UNS R05200, unalloyed tantalum, powder-metallugry consolidation;
3. ASTM B 521 -98 UNS R05255, tantalum alloy, 90% tantalum 10% tungsten alloy, vacuum melted;
4. ASTM B 521 -98 UNS R05252, tantalum alloy, 97.5% tantalum 2.5% tungsten alloy, vacuum melted;
5. ASTM B 521 -98 UNS R05240, tantalum alloy, 60% tantalum 40% columbium, electron-beam furnace or vacuum-arc melt, or both.