The main materials used for locks are

Copper, stainless steel, zinc alloy, steel, aluminum or aluminum alloy, etc.
Copper: It is one of the most widely used lock materials. It has good mechanical properties, good corrosion resistance and processing performance, and is bright in color. Especially for copper-forged handles and other lock decorative parts, it has a smooth surface, good density, and no pores. Trachoma.
2 Stainless steel: durable, brighter with use. It has good strength, strong corrosion resistance and unchanged color
3. Zinc alloy material: Its strength and rust-proof ability are poor. The advantage is that it is easy to make parts with complex patterns, especially pressure casting. Locks with more complex patterns seen on the market are mostly made of zinc alloy.
Aluminum or aluminum alloy: Ordinary aluminum alloy (except for aerospace use) is soft and light, with low material strength, but easy to process and form.