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Monel Bellows Expansion Joints

Salt water is usually a tough environment on piping components. This is also true for metal bellows expansion joints. All the fantastic marine corrosion resistant materials, like copper and bronze, aren't an easy task to weld when creating bellows.

An excellent bellows alloy material for applications close to salt water is Monel, the registered trade mark of Special Metals Corporation. http://nickelalloyspecialist.com, or generically named alloy 400 is often a nickel-copper alloy that's been around for countless years and has a great corrosion resistant material track record. The ASTM sheet designation is B127-400. Much like many metals in marine applications alloy 400 works well in lowing salt-water. Stagnant salt-water may cause pitting corrosion.

The most typical bellows material, series 300 stainless-steel, could be at risk of stress corrosion cracking and salt water is loaded with chlorides. Alloy 400 is resistant to stress corrosion cracking. The information is also attractive other corrosive applications for example hydrofluric, hydrochloric, and sulfuic environments. As with all material selection, a metallurgist should recommend the bellows material to be utilized for a given application.

Alloy 400 also strengthens well in sub-zero temperatures much like stainless steel. With regards to marine engine applications the majority of the bellows remain stainless-steel. This is probably because stainless steel performs better with the higher engine temperatures as well as having superior fatigue resistance that's needed for engine vibration.

Alloy 400 weld well and forms well, making it an excellent material for bellows manufacture.