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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 of the really good marine corrosion resistant materials, like copper and bronze, are not very easy to weld when creating bellows.

A fantastic bellows alloy material for applications in and around salt-water is Monel, the registered trade mark of Special Metals Corporation. [http://monel400.webs.com/ nickelalloyspecialist.com], or generically named alloy 400 can be a nickel-copper alloy which has been around for countless years and contains a fantastic corrosion resistant material history. The ASTM sheet designation is B127-400. Just like many metals in marine applications alloy 400 is effective in lowing salt-water. Stagnant brine could cause pitting corrosion.

The most typical bellows material, series 300 stainless-steel, may be susceptible to stress corrosion cracking and salt-water is loaded with chlorides. Alloy 400 is proof against stress corrosion cracking. The pad is additionally beneficial in 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 to get a given application.

Alloy 400 also supports well in sub-zero temperatures comparable to stainless steel. With regards to marine engine applications the majority of the bellows are still stainless-steel. This could be because metal performs better on the higher engine temperatures together with having superior fatigue resistance you require for engine vibration.

Alloy 400 weld well and forms well, rendering it a fantastic material for bellows manufacture.