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Hastelloy C-22 Tubing, AL-6XN Tubing, Piping & Fittings
Sanitary & High Purity Exotic Alloy Tubing
Sales & Service in MI, WI, IA, IL, IN, OH, KY, TN, WV, PA
Due to the demanding and complex nature of many of today’s sanitary processes, additional chemical and corrosion resistance is needed beyond the capabilities of conventional alloys. In order to solve this problem, Pureserve Systems is able to provide customers with Hastelloy C-22 and AL-6XN piping, tubing, fittings, ferrules and more.
Hastelloy C-22 Tubing and FittingsPureserve Systems offers customers polished-surface Hastelloy C-22 tubing with corrosion resistance superior to 304 and 316 stainless steels or AL-6XN alloy.
Hastelloy C-22 alloy is one of the most versatile nickel-chromium-molybdenum-tungsten alloys available today. This alloy demonstrates improved corrosion resistance to both uniform and localized corrosion and will exceed the performance of Hastelloy C-276, Hastelloy C-4 and alloy 625 in a variety of corrosive environments.
The high chromium (Cr) content of Hastelloy C-22 contributes to the alloy's outstanding resistance to pitting, crevice corrosion and stress corrosion cracking. Hastelloy C-22 tubing has excellent resistance to oxidizing aqueous media, including wet chlorine and nitric acid mixtures or oxidizing acids with chloride ions. Molybdenum (Mo) and tungsten (W) supply the resistance to wet reducing media (e.g. hydrochloric and sulfuric acids). The high level of nickel (Ni) is responsible for Hastelloy C-22's resistance to attack by chlorides, fluorides and other halide compounds at ambient and elevated temperatures.
Hastelloy C-22 Tubing and Fittings Advantages
Critical Pitting Temperature
The lowest temperature at which pitting corrosion begins in a 24-hour immersion
Critical Crevice Corrosion Temperature
The lowest temperature at which crevice corrosion begins in a 100-hour immersion
Resistance to Localized Corrosion
Test data for general corrosion is often used to compare the corrosion resistance of metals in various environments. However, stainless steels fail more often due to pitting and crevice corrosion than from general corrosive attack.
Hastelloy C-22 fittings are available in the same sizes as the sanitary tubing, 0.5" through 2" ODs. Most Hastelloy fittings are offered in the standard BPE dimensions. Heavy wall tank ferrules are also available in larger sizes, since they weld directly to tank shells and heads and do not require tubing as a component.
Most Hastelloy C-22 fittings are available in butt-weld form, Tri-Clamp, and I-Line. Custom Hastelloy fittings are available upon request.
The standard finish on AL-6XN and C-22 fittings is 32 microinch RA ID and OD. Mechanical abrasive or electropolish finishes are also available with a 25RA max ID finish. Unpolished fittings may be available upon request.
AL-6XN Tubing and FittingsPureserve Systems supplies a complete line of sanitary tubing and fittings in AL-6XN alloy for the processing industries. AL-6XN Tube and Fittings provide superior corrosion resistance where traditional 316L stainless steel components are inadequate.
AL-6XN alloy is a super-austenitic metal designed to resist crevice corrosion, pitting, chloride-induced corrosion, and stress corrosion cracking. It can also withstand alkaline and salt solutions, protecting against metallic contamination of product and preventing rapid degradation of the fluid transfer system.
Originally developed for seawater applications, AL-6XN is used successfully in food, pharmaceutical, and biopharmaceutical processes. The "superalloy" resists the attack of corrosive food and beverage products such as: sports drinks, ketchup, soy and barbecue sauce, and salsa. It is also beneficial in fine chemical, cosmetic and pharmaceutical (cosmeceutical), brewery, desalination, semi-conductor, aerospace, biopharm, pulp and paper, and gas handling applications.
Advantages of AL-6XN Tubing and Fittings
AL-6XN alloy is resistant to a broad range of corrosive environments. Processes with chloride-induced corrosion in the forms of pitting, crevice and stress corrosion cracking in 300 series stainless steels are often better managed with AL-6XN alloy. AL-6XN alloy is also resistant to corrosion from various acids and salt solutions. This is due to the higher concentrations of the following elements in the alloy:
• Nitrogen – which retards the formation of chi phase during manufacturing and field welding
• Chromium – provides good resistance to oxidizing environments
• Molybdenum – improves resistance to chlorides.
Life-cycle costs for systems utilizing AL-6XN Tubing and Fittings can be far less than the comparable costs of the initial installation, maintenance, and subsequent replacement of lesser alloys used in aggressive environments.
In addition to material replacement, labor costs, and production downtime caused by system failures in corrosive environments, consideration must also be given to the associated costs of product contamination caused by corrosion.
The toughness and ductility of AL-6XN Tubing and Fittings provides for relative ease of fabrication in the shop or field environments. Low carbon and high nitrogen content minimizes the precipitation of carbides and secondary phases that can occur during welding. Field welding can be easily achieved when suitable over-matched filler rings are used (see weld insert rings) and the material has been properly cleaned and prepared for welding. Welding procedures are similar to those used with other austenitic stainless steels.