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ASTM A213 TP316Ti seamless tubes, 1" (o.d.) x 0.065" (w.t.) x 30' (l), supplied to a heat exchanger manufacturer in Genoa, Italy.
ASTM A213 TP316Ti seamless tubes are primarily used for pressure piping in accordance with ASME B31.1 – Power Piping and ASME B31.3 – Process Piping. It has the nominal composition of 16Cr-12Ni-2Mo-Ti, with UNS designation S31635 and P-No. 8. Titanium is added to the molybdenum-bearing stainless steel to tie up the carbon content so that the damaging chromium carbide precipitation (chromium depletion) can be avoided. Thus, TP316Ti tubing can be applied to services with long exposure to temperatures in sensitization range. The tubing sizes and thicknesses usually are 1/8″ in inside diameter to 5″ in outside diameter, and 0.015″ to 0.500″, inclusive, in minimum wall thickness or average wall thickness. The permissible variations (tolerances) of outside diameter, length, and wall thickness (minimum or average) wall thickness shall be in accordance with ASTM A1016.
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The ASTM A213 TP316Ti tubing shall be made by the seamless process and shall be either hot finished or cold finished. Usually, the 316Ti stainless steel shall be made by electric-arc furnace (EAF) melting, with subsequent argon-oxygen decarburization (AOD) and ladle furnace refining. The cast tube ingot passes through the roughing mill for preliminary rolling and is ground on the billet grinder. The tube billet (ingot) is then forged on the radial forging mill to attain desired diameter for further processing. The seamless tube is then made by combined processes of hot-piercing/ hot extrusion, and cold drawing & cold rolling. The tubing will be marked and packaged after heat treatment and straightening on a leveller.
ASTM A213 TP316Ti seamless tubing shall be furnished with solution annealing treatment, in which the tubing is soaked at a temperature no less than 1900°F [1040°C] for full austenization and it is quenched in water after leaving the furnace. A subsequent stabilizing heat treatment may be applied at a temperature lower than that used for the initial solution annealing heat treatment. The holding temperature of stabilizing heat treatment shall be between 1550-1650°F [845-900°C] for TP316Ti.
ASTM A213 TP316Ti tubes are primarily used for the construction of boilers, superheaters, and heat exchangers. When inserted in a boiler or tube sheet, the tubing shall stand expanding and beading without showing cracks or flaws. When applied to superheaters, it stand all forging, welding, and bending operations necessary for application without developing defects. TP316Ti tubes are often welded autogenously. Care must be taken to avoid solidification cracking and to preserve corrosion resistance of the weld and heat affected zones. If filler metal must be used for welding TP316Ti tubing, it is advisable to utilize the low carbon types 316L or E318 filler metals. The weld region must be cleaned thoroughly to avoid any residual copper or zinc, which may create weld cracking.
Tensile test, hardness test, chemical analysis, flattening test, flaring test, visual examination, dimensional inspection, eddy current test/ hydrostatic test are required for ASTM A213 TP316Ti seamless tubing. When specified, the tubing shall pass intergranular corrosion tests conducted in accordance with ASTM A262 Practice E.
The minimum and maximum design temperature limits for ASTM A213 TP316Ti in power piping of ASME B31.1 are 100°F and 1200°F, respectively. The minimum & maximum design temperature limits for ASTM A213 TP316Ti tubing in process piping are -325°F and 1500°F, respectively.
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