Commercial alloys with nickel-copper ratios of approximately 2:1 by weight are referred to as monel. Monel is harder than copper, extremely corrosion resistant, and possesses high impact strength (as measured by the Izod test). Monel alloys resist corrosion in a wider range of environments. It has greater resistance than nickel to sulphuric acid, brine and water.
Monel's thermal conductivity, although lower than that of nickel, is significantly higher than that of nickel alloys containing chromium or iron. Because of its good thermal conductivity and corrosion resistance, it is often used in heat exchangers.
Properties and characteristics
- High corrosion resistance. Monel is well known as a corrosion resistant and mould resistant material. It resists corrosion and acids, and some alloys can withstand fire in pure oxygen.
- Stronger than steel.
- Low coefficient of thermal expansion.
- Highly resistant to alkalis.
- Can be brazed and soldered.
Types of monel
There are different types of commercial monel, such as monel 400, monel 401, alloy R-405, alloy R-450, alloy K-500 or the copper-nickel alloy monel 404.
Uses and applications of monel
In eyewear it is used for rods, bridges and fore-ends, and less frequently for rims; it allows very strong welds and a non-wearing finish.
In yachting, it is used as a substitute for stainless steel to reduce galvanic corrosion when, for example, stainless steel rivets are used on aluminium masts or booms. Monel rivets reduce this process. On trumpet pistons, to make them corrosion and shock resistant.
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