The Basics of Nickel Metal Alloy Tubing

August 24, 2011 in Pipe by

Nickel is an element that is commonly found in metal alloys. For example, nearly all stainless steel contains some percentage of nickel. Nickel improves resistance to oxidation and corrosion. When added to high chromium stainless steel, nickel has a tendency to form austenite and is responsible for a great toughness and high strength at both high and low temperatures. It increases toughness at low temperatures when added in smaller amounts to alloy steels.

Here are brief overviews of two of our more requested nickel alloy tubes.

Nickel 400 Tubing

Nickel 400 tubing is a nickel-copper alloy typically consisting of approximately 67% nickel and 23% copper, with smaller amounts of other elements. Nickel 400 tubing is typically used in gasoline and freshwater tanks, chemical and hydrocarbon processing equipment, crude petroleum stills, crude oil distillation towers, boiler feed water heaters and other heat exchangers, de-aerating heaters, marine engineering, chlorinated solvents, industrial heat exchangers and valves, pumps, shafts, fittings, and fasteners. Nickel 400 tubing has excellent resistance to seawater and steam at high temperatures and excellent resistance to neutral and alkaline salt. It has some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is usually not the material of choice for these acids.

Nickel 625 Tubing

Nickel 625 tubingNickel Alloy Tube 625 is a very different allow from nickel 400 tubing. Nickel 625 tubes are typically 20% to 30% chromium, 8% to 10% molybdenum, with most of the remaining 60% to 72% being nickel. Nickel 625 tubing is typically used in the aerospace industry, including jet engine exhaust systems, aircraft ducting systems and engine thrust-reverser systems. Nickel 625 tubes can also be found in specialized seawater equipment and chemical processing equipment. Nickel 625 tubes are typically immune to chloride ion stress corrosion cracking, seawater pitting and crevice corrosion and oxidation up temperatures up to 1800° F. Nickel 625 tubes are also non-magnetic and have a high creep-rupture strength.

All materials supplied by St. Louis Pipe and Supply will meet or exceed ASTM, ASME, ANSI and/or API standards, per your required specifications including full documentation. The items are available in domestic or import from stock, but if a particular item is not in stock at the moment of you request, we guarantee same day shipping or shortest lead time available.

If you have any questions about nickel 400 tubes or nickel 625 tubes, please feel free to contact us.  Or if you’re pricing for tubes, allow us to give you a quote.

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