These raw materials are all raw materials used in the manufacture of jigs and jigs, but they are different raw materials and have different uses. The characteristics of each raw material are different. I will give you a general footnote and the usage of each raw material.
1, A3, 45, raw material control is cheap, usually used in motherboards without auxiliary fixtures;
2, P20, CR12MOV, usually the important part of the fixture, because the selected raw materials can be wear-resistant, the service life of the product will be strengthened, and the accuracy of the application is guaranteed;
3, S136 raw materials, if the main performance is wear and rust. Usually used in welding jigs is a commonly used raw material;
4, SKD11 raw materials are usually used in the inspection tool with some careful and wear-resistant jig;
5, tungsten steel, this raw material used a little less control, because the cost of raw materials is quite expensive, usually used in careful inspection tools, if the main wear-resistant rust is high;