Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1/4 of that of steel. The tensile strength of carbon fiber resin composites is generally above 3500MPa, 7~9 times that of steel, and the tensile elastic modulus of 23000~43000MPa is also higher than that of steel. Therefore, the specific strength of CFRP, that is, the ratio of the strength of the material to its density, can reach more than 2000MPa/(g/cm3), while the specific strength of A3 steel is only about 59MPa/(g/cm3), and its specific modulus is higher than that of steel.
