Monel Fasteners

Monel Fasteners is a group of nickel alloys, primarily composed of nickel (up to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater. They can be fabricated readily by hot- and cold-working, machining, and welding.

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Detailed Description for Monel Fasteners

Monel alloy is a binary alloy of the same proportions of nickel and copper as is found naturally in the nickel ore from the Sudbury (Ontario) mines and is therefore considered a puritan alloy. It is a very expensive alloy, with cost ranging from 5 to 10 times the cost of copper and nickel, hence its use is limited to those applications where it cannot be replaced with cheaper alternatives. Compared to carbon steel, piping in Monel is more than 3 times as expensive.

Monel is a solid-solution binary alloy. As nickel and copper are mutually soluble in all proportions, it is a single-phase alloy. Compared to steel, Monel is very difficult to machine as it work-hardens very quickly. It needs to be turned and worked at slow speeds and low feed rates. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen. It is commonly used in applications with highly corrosive conditions. Small additions of aluminium and titanium form an alloy (K-500) with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. Monel is typically much more expensive than stainless steel.

Monel alloy is notable for its toughness, which is maintained over a considerable range of temperatures. Monel alloy has excellent mechanical properties at subzero temperatures. Strength and hardness increase with only slight impairment of ductility or impact resistance. The alloy does not undergo a ductile-to-brittle transition even when cooled to the temperature of liquid hydrogen. This is in marked contrast to many ferrous materials which are brittle at low temperatures despite their increased strength.

 

Characteristics

·         Resistant to seawater and steam at high temperatures

·         Excellent resistance to rapidly flowing brackish water or seawater

·         Excellent resistance to stress corrosion cracking in most freshwaters

·         Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated

·         Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom the material of choice for these acids

·         Excellent resistance to neutral and alkaline salt

·         Resistance to chloride induced stress corrosion cracking

·         Good mechanical properties from sub-zero temperatures up to 1020° F

·         High resistance to alkalis

 

Applications:

·         Marine engineering

·         Chemical and hydrocarbon processing equipment

·         Gasoline and freshwater tanks

·         Crude petroleum stills

·         De-aerating heaters

·         Boiler feed water heaters and other heat exchangers

·         Valves, pumps, shafts, fittings, and fasteners

·         Industrial heat exchangers

·         Chlorinated solvents

·         Crude oil distillation towers


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