The materials of automobile tire screws usually include the following:

1. Alloy steel: Alloy steel is one of the most commonly used materials for automobile tire screws. It has high strength and corrosion resistance, and is suitable for the environment under vehicle load and vibration. Alloy steel tire screws are usually processed by heat treatment to improve their hardness and wear resistance.

2. Stainless steel: Stainless steel tire screws have good corrosion resistance and are suitable for use in wet or corrosive environments. Stainless steel tire screws are usually used for vehicles that need to be exposed to humid environment for a long time, such as coastal areas or areas where salt melting agents are used on winter roads.

3. Aluminum alloy: Aluminum alloy tire screws are lightweight, which is suitable for occasions requiring vehicle weight reduction. Aluminum alloy tire screws are usually used in racing cars or high-performance vehicles to improve the handling and acceleration performance of vehicles.

4. Titanium alloy: Titanium alloy tire screws have extremely high strength and corrosion resistance, and are suitable for vehicles with extremely high requirements for tire screws such as high-performance racing cars or super sports cars.

Generally speaking, the material selection of automobile tire screws depends on the use environment, performance requirements and manufacturing cost of the vehicle. When selecting tire screws, the appropriate materials should be selected according to the specific conditions and needs of vehicles to ensure the safety and reliability of tire screws.