Seamless tubes, production

ISO 2604-2, Steel products for pressure purposes — Quality requirements — Part 2 Wrought seamless tubes. 

Tantalum may be formed into tubular products by lap or butt welding or by seamless drawing. Such tubes are thin-walled, in a variety of thicknesses, and cannot be threaded. Lap-welded tubing is made in inside diameters from % in. up, and butt-welded from 3 in. up. Seamless tubing is produced in a range of wall thicknesses in inside or outside diameter from Ks to 2 in. 

Table S.l-irl Standard carbon steel compositions applicable to semi-finished products for forging, hot-rolled and cold-finished bars, wire rods, and seamless tubing [1.80]. Selected grades...

Ti-3A1-2.5V, which is intermediate in strength between unalloyed titanium and Ti-6A1-4V, has excellent cold formability required for production of seamless tubing, strip and foil. Like Ti-6A1-4V, T1-3A1-2.5V has a high strength-to-weight ratio and is lighter than stainless steel. Ti-3A1-2.5V has... 

Product Ingot, billet, plate, sheet, strip, seamless tube. Forms castings, and welded tube. 

Aluminum alloys have a systematic numbering system as shown in Table 4.2. The specification number also designates the various product forms. For example, SB 209 applies to plate products, and SB 210 applies to drawn seamless tube poducts. The first digit of the alloy designation number indicates its major alloying element as shown in Table 4.2. 

For extrusion, a bar of metal is forced through a die orifice by a compressive force that is applied to a ram the extruded piece that emerges has the desired shape and a reduced cross-sectional area. Extrusion products include rods and tubing that have rather complicated cross-sectional geometries seamless tubing may also be extruded. 

Metallic pipe systems comprise the majority of applications. Metallic pipe, tubing, and pipe fittings are divided into two main categories seamless and welded. Both have advantages and disadvantages in terms of economy and function. Specifications governing the production of these products dictate the permissible mechanical and dimensional variations, and code design calculations account for these variations. 

The metal tube is a multiple-use container sealed with a moisture-proof closure. The tablets are stacked on top of one another. Consequently, a minimum of air surrounds them. The tubes are seamless, extruded aluminum packages. They are closed by tightly fitting plastic snap caps that contain a desiccant chamber. Tubes of plastic materials, such as polyvinyl chloride or polypropene, have been tested with effervescent tablets. Acceptable stability was obtained with some of these products. Plastic tubes are used more often due to their lower cost and lower noise level during the packaging operation. 

Tubing or pipe may be seamless or welded. Seamless products are made from a billet, which is pierced through the center to make it hollow and then drawn to size. Welded products are made from skelp, a coil of flat strip that is first... 

Source P.T. Rnden, Production of Seamless Titanium Tubing, presented at 6th World Conference on Titanium (France), 1988... 

Note Holed extrusion billets (machined from as-quenched fbi ging) were coated with lubricant, induction heated to 695 to 980 °C (1100-1800 °F), transfiarred automatically to the press and extruded over a mandrel. Ihe extrusion process was essentially isothermal and was characterized by a slow extrusion speed (<30 in./min) with relatively low extrusion ratios (<20). Extruded tube was cold reduced as indicated. Source P. Finden, Production of Seamless Titanium Alloy Thbing, in Sixth World Conference on Titanium, P Lacombe, R. Tricot, and G. Beranger, Ed., Les Editions de Physique, Paris, 1989, p 1251... 

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