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Pub 106 - Corrosion Resistance of Copper and Copper Alloys

This large table gives information on the suitability of copper and copper alloys with many different chemicals. Data is given for copper, brass, copper-nickel, aluminium bronze and gunmetals at three temperatures and shows if specific materials can be used with chemicals giving an indication of corrosion resistance. 5pp.

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Copper Alloys in Marine Environments - Pub 206

The aim of this publication is to provide engineers with an  appreciation of copper alloys commonly used in marine applications. It will provide an overview of the range of alloys and their properties, and give references and sources for further information. 2018. 32pp.

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Copper Alloys in Seawater: Avoidance of Corrosion - Pub 225

Corrosion of copper alloys in seawater can be mitigated. This publication offers practical guidance on alloy selection, design and preventative measures and has been written principally for marine, mechanical and other engineers who have to select materials of construction but do not have a corrosion background. 2018. 20 pp.

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What type of bronze is used for modern works of art?

Bronze has been used for centuries to create statues, and is still the first choice for modern, striking works of art. The most widely-used alloys for such objects are leaded gunmetals, such as CC492K and CC491K.

I am trying to identify the brass Hpb59-1. It is proposed to use this brass in the cast condition for valves used in fire protection systems in buildings.

This is a Chinese Specification composition 57-60 copper, 0.8-1.9% lead, balance zinc. It is a leaded Muntz Metal. A more suitable alloy for this application would be the gunmetal LG2 (CC491K) 85%copper, 5% tin, 5% zinc, 5% lead. It has better corrosion resistance and is easily cast.

I am using a leaded gunmetal casting which is machined and then crimped onto a copper pipe. I have had a number of failures due to leakage. Can you explain this?

Leaded Gunmetal is a cast alloy which is not designed to be cold worked. Crimping involves extreme deformation which will not usually be tolerated by the gunmetal without cracking. However, castings do not have a uniform structure and in the areas free from lead and possibly a smaller grain size some ductility is present. This will account for some of the castings surviving the crimping without cracking.

I have been asked to produce 22 valves in gunmetal from a drawing which originates from 1958. The company has been taken over and the patterns and casting drawings lost. Due to the small quantity that will have to be made from bar, what should I use?

Suggest that you use continuously cast CC491K (LG2) bar or a wrought free-machining phosphor bronze.

What material is recommended for underground pipe fittings?

Gunmetal or dezincification resistant brass.