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How to choose the material of the spring?

We should pay attention to the hardenability of the steel when selecting the spring material.

When the spring works under the condition of variable humidity, such as water (including seawater) and water vapor environment, copper alloy is generally used.
When the spring works under acid and other corrosive media, generally use corrosion-resistant materials such as stainless acid-resistant steel or nickel alloy.
In the general environment, we usually select ordinary spring steel, and the surface is coated with anti-rust or electroplating (galvanized, cadmium, copper) to prevent corrosion.