Currently, the automotive air intake grille materials on the market are mainly divided into carbon steel, aluminum alloy, magnesium alloy, engineering plastics, carbon fiber materials, etc. Among them, carbon fiber composite materials are high-strength and high-modulus fibers. They are light in weight, strong in rigidity, strong in impact resistance, easy to be integrally formed to meet individual needs, and have good vibration damping performance, good noise reduction and shock absorption effects, and are easy to use. Maintenance features make it the best choice for car air intake grille materials. The basic properties of air intake grilles made of various materials are as follows.

　　1. Carbon steel. In the development process of automobile air intake grille materials, carbon steel was initially the main material. Its advantages are low cost, wide application range, tensile strength of 110~130MPa, density of 7.81~7.85g/cm3, not easy to deform, carbon steel has high density and is cheap.

　　2. Aluminum alloy material. Compared with carbon steel air intake grilles, aluminum alloy air intake grilles are light in weight (density is 2.63~2.85g/cm3), have strong oxidation resistance and high plasticity, and can be used in cold working and plastic forming processing (tensile strength is 320MPa). Aluminum alloy air intake grilles are more susceptible to damage than steel air intake grilles, and subsequent maintenance costs are high.

　　3. Magnesium alloy materials. Magnesium alloy is characterized by low density (about 1.8g/cm3), light weight, high hardness, and large elastic modulus. It has good damping and shock-absorbing properties, with a tensile strength of 290MPa and good heat dissipation.

　　4. Engineering plastics. Engineering plastics commonly used in air intake grilles include acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate and acrylonitrile-butadiene styrene copolymers and blends (PC/ABS), polypropylene ( PP) etc. ABS resin has low water absorption, high impact resistance, tensile strength of 70~90MPa, and density of 1.04~1.08g/cm3. It also has rigidity, oil resistance, cold resistance, easy molding, low cost, and easy deformation at high temperatures. Features. PC/ABS material combines the properties of two materials and has good formability, mechanical properties, impact resistance, high temperature resistance, UV resistance, etc., with a density of 1.10~1.16g/cm3. PP engineering plastics have impact resistance, good mechanical properties, strong corrosion resistance, and a density of only 0.89~0.91g/cm3.

　　5. Carbon fiber composite materials. The density of carbon fiber composite materials is 1.5~1.8g/cm3, the tensile strength is greater than 3500MPa, and the elastic modulus is 230GPa. Its density is lower than that of metal materials, but its strength can reach 2.4 to 5.8 times that of metal, its load-bearing capacity is greater than that of metal, and its mass is smaller.

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