Brass valves, how to control copper quality?

Brass alloys with less than 36% zinc are composed of solid solutions and have good cold working properties. For example, brass with 30% zinc is commonly used to make shell cases, commonly known as shell brass or 733 brass. Brass alloys with zinc content between 36 and 42% are composed of and solid solutions, of which the most commonly used is hexagonal brass with zinc content of 40%. In order to improve the performance of ordinary brass, other elements are often added, such as aluminum, nickel, manganese, tin, silicon, lead and so on. Aluminum can improve the strength, hardness and corrosion resistance of brass, but reduce the plasticity, so it is suitable for Marine condensing tubes and other corrosion resistant parts. Tin can improve the strength of brass and corrosion resistance to seawater, so it is called naval brass, used for ship thermal equipment and propellers. Lead can improve the cutting performance of brass. This free cutting brass is often used as a clock part. Brass castings are often used to make valves and plumbing fittings.

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