What materials are nut shells usually made of?

The nut shell, commonly known as the nut, is made of a variety of materials to meet the needs of different industries and application scenarios. The following are some common nut shell materials:

1. Metal materials
Carbon steel
Low carbon steel: such as A3 steel (commonly known as A3 steel in China, and basically known as 1008, 1015, 1018, 1022, etc. abroad), mainly used for products without hardness requirements such as 4.8 grade nuts and 4 grade nuts, small screws, etc.
Medium carbon steel: The carbon content is between 0.25% and 0.45%, with higher strength and hardness.
Alloy steel: Alloy elements such as chromium and molybdenum are added to ordinary carbon steel to increase the special properties of steel, such as 35, 40 chromium molybdenum, SCM435, 10B38, etc.
Stainless steel
Austenitic stainless steel: such as SUS302, SUS304, SUS316, etc., with good heat resistance, corrosion resistance and weldability.
Martensitic stainless steel: such as 13%Cr stainless steel, has poor corrosion resistance, but high strength and good wear resistance.
Ferritic stainless steel: such as C1, C2, C4 ferritic stainless steel, has good corrosion resistance.
Copper material
Brass: has good electrical and thermal conductivity, as well as extremely high corrosion resistance, and is often used in the manufacture of molds and electronic equipment.
Aluminum alloy
Aluminum alloy nuts are lighter than other nuts, but have sufficient strength. At the same time, excellent corrosion resistance is also one of the characteristics of aluminum nuts.
2. Plastic materials
Nylon (Nylon)
Especially nylon 66 (NYLON66), which is known for its excellent wear resistance, heat resistance and chemical corrosion resistance, is one of the most commonly used plastic nut manufacturing materials in China. Nylon nuts not only have good insulation properties and are non-conductive, but also maintain low signal interference under the influence of current or other electrical signals.
Polycarbonate (PC)
It has high transparency, high strength, good heat resistance and UV resistance, and can maintain good physical and chemical properties under harsh environmental conditions. PC nuts not only have good insulation properties, but also can work stably in environments that need to resist external impact.
Polyvinylidene fluoride (PVDF)
It is favored for its excellent acid and alkali resistance. PVDF is a fluorine-containing plastic with extremely high chemical stability and corrosion resistance. It can be used for a long time in harsh chemical environments such as strong acids and strong alkalis without damage.
Polypropylene (PP)
It has the characteristics of low density, good heat resistance, excellent processing performance, and relatively low cost. PP nuts not only have good insulation properties, but also maintain stable performance in general acid and alkali environments.
Polyoxymethylene (POM)
It is used to make specific types of plastic nuts due to its excellent wear resistance. POM nuts perform well in situations where high wear resistance is required, such as mechanical transmission parts, bearings, etc. In addition, POM also has good mechanical strength and rigidity.