What are the materials of bicycle frame? What are their characteristics?

With the progress of material science and processing technology, the heavy "iron horse" has not adapted to the needs of modern life. The use of composite materials makes bicycles a high-tech means of transportation. The following introduces the widely used materials of the front fork of the frame. \ x0d \ x0d \ 1。 Carbon steel: \ x0d \ x0d \ Iron (Fe)-carbon (C) alloy without any alloying elements intentionally added is carbon steel, and carbon can improve the strength in steel. The higher the carbon content, the better the strength, but when the carbon content is higher than 0.8%. \ x0d \ x0d \ 2。 Molybdenum-chromium alloy steel: \ x0d \ x0d \ Steel made by adding one or more general elements to carbon steel is alloy steel, and molybdenum (Mo) and chromium (Cr) are added, which is called molybdenum-chromium alloy steel. The function of \ x0d \ x0d \ molybdenum is to improve the strength of steel and prevent temper brittleness. \ x0d \ x0d \ chromium's function: corrosion resistance, rust prevention and high temperature oxidation prevention. \ x0d \ x0d \ Mo-Cr alloy steel ranks first among alloy steels in strength, and it is easy to draw pipes and reduce weight, so it has become the most commonly used material for frame and front fork. At present, the drawing name of Mo-Cr alloy steel is \ x0d \ x0d \ buttered (one-time drawing) or two elements and two wall thicknesses. \ x0d \ x0d \ Duble butt joint (secondary pumping) or three-dimensional, three wall thicknesses. \ x0d \ \ x0d \ Triple butt joint (or four dimensions) with four wall thicknesses. \ x0d \ x0d \ piping is used to make the arch bridge with thin sides and thick steel pipes have the same shape strength, light weight and more metallic feeling. \ x0d \ x0d \ 3。 Aluminum alloy: \ x0d \ x0d \ aluminum is the most abundant metal on the earth, with light weight, corrosion resistance and moderate strength, which makes scientists predict that it may replace today's steel in the future. Aluminum and other metals synthesize aluminum alloys, of which copper is the most common. The use of copper in aluminum alloy is similar to that of carbon in steel, but aluminum alloy used for corrosion resistance cannot contain copper. Originally, the characteristic of aluminum is that it is easily oxidized. Fortunately, it has a higher corrosion resistance than copper and iron because oxygen flowers in the air form a very fine film of AI2 O3, which can protect the inside from oxidation. The so-called anodizing treatment can not only produce a faint AI2 O3 film on the surface of aluminum products, but also be beautiful and anti-corrosive. In addition, the surface of aluminum alloy is easy to dye, and a colored film can be grown to get the desired color. \ x0d \ x0d \ 4。 Magnesium alloy: \ x0d \ x0d \ magnesium is an extremely flammable metal. In early photography, magnesium light, that is, the strong light produced by the burning of magnesium powder, is about 2/3 of that of aluminum alloy. Although they are light, they are not easy to process and fragile, so at present, they are generally used except magnesium alloy for the front fork shell of ROCK-SHOX shock absorber. \ x0d \ x0d \ 5。 Titanium alloy: \ x0d \ x0d \ titanium (Ti) ranks fourth among the metals on the earth. The strength of titanium and its alloy is only half that of American alloy steel, but its weight and strength are only half that of American alloy steel. Coupled with its excellent corrosion resistance, it has become an essential material for military, aviation and aerospace industries. At present, the universality of titanium alloy tubes for bicycles is not high because of their smelting cost. \ x0d \ x0d \ 6。 Carbon fiber: \ x0d \ x0d \ carbon fiber is a new material with high strength and light weight. Strictly speaking, it is a composite material, not a single material. Other resins, glass fibers, aluminum alloys, etc. It can be mixed or overlapped according to its characteristics, and it is the lightest frame material at present. Carbon fiber tube is a carbon fiber cloth woven by a small fiber thread. \x0d\\x0d\ At present, there are mainly the following materials that can be used to manufacture bicycle frames: steel, aluminum alloy, titanium alloy, magnesium alloy, scandium alloy, carbon fiber, etc. Generally, there are mainly steel, aluminum alloy, titanium alloy and carbon fiber on the market. Scandium alloy and magnesium alloy are relatively rare materials that have only recently appeared.