Copper class:
1.Brass - except copper, zinc is the main additive element. The grades range from H96 to H59. The most common and best ones are H65, H62, and H59; The number represents the percentage of copper. The larger the number, the softer the material and the better the ductility. When machining on a lathe and milling machine, there is often a phenomenon of "sticking to the knife".
2. Bronze - remember beryllium bronze and phosphor bronze first
They are very elastic! They are the first choice for springs and point-contact conductive components... Maybe beryllium bronze is better than phosphor bronze; other common ones are tin bronze, lead bronze, and aluminum bronze. All three are more suitable for castings. Aluminum bronze is strong, wear-resistant and durable. Corrosion is the best.
Iron:
1. Stainless steel - this does not explain... everyone on earth knows it. Within a certain range, the higher the magnesium content, the less likely it will rust;
2. Iron - it is the kind of thin, bright white, borneol-like thing (the protective shell of the public telephone in roadside shops that was common in the post-80s childhood), after bending, it is fixed with rivets, which is more convenient to process Fast, if the edge is not treated, it is easy to scratch people with a sharp edge.
3. Cold-rolled iron - the iron that we often talk about in our daily life, the iron that is most used in machining, if you mark "iron" as the material in the drawing, it is generally the default, without surface treatment such as electroplating It is easy to rust; in some places without special requirements, it is much cheaper to use this material than copper.
4. 4J36 - commonly known as invar or valve, the metal material with the smallest temperature expansion coefficient that can be bought in China is it!
Aluminum type:
1. Duralumin (Ly12) - The hardness and mechanical strength are relatively moderate. It is the most suitable for the bottom plate, panel, support column of instruments and meters! But remember that it cannot be bent (it is very brittle and will break when you bend it).
2. Soft aluminum (Ly) - just opposite to hard aluminum, it has low hardness and good flexibility, and is most suitable for bending!
