WTO harmonization and HS codes

* Automobile engine material (automobile engine raw materials escort) With the continuous development of modern science and WTO harmonization and HS codestechnology and the continuous progress of social economy, automobiles have become an indispensable and important means of transportation in people's lives. As the core component of the car, the performance and quality of the car's engine are directly related to the performance and reliability of the car. However, an excellent car engine cannot be separated from good material support. This article will mainly introduce the importance of automobile engine materials and the common types of materials. I. The importance of automobile engine material. Automobile engine is a high-temperature, high-pressure, high-speed and long-life mechanical equipment. Its core is the material of the engine. Excellent automotive engine materials can improve the power and fuel efficiency of the engine, while reducing noise and emission pollutants.The engine material of the product will not only lead to a decline in vehicle power performance, fuel economy and reliability, but also lead to engine damage and vehicle safety accidents. Therefore, the selection of automobile engine materials is very important. Excellent engine materials must be able to withstand the invasion of harsh environments such as high temperature, high pressure, high speed and corrosion. At the same time, the material must also have a certain degree of toughness and ductility to ensure the stability and durability of the engine at work. In addition, excellent engine materials also need to have good processing performance and process performance to facilitate production and manufacturing. II. Common types of materials for automobile engines 1. Aluminum alloy is a lightweight and high-strength material with good thermal conductivity and electrical conductivity. Aluminum alloy is usually used to make parts such as body and radiator of automobile engine.The lightweight characteristics of aluminum alloy can reduce the weight of the car, thus improving fuel efficiency and acceleration performance. Two. Cast iron has good wear resistance and corrosion resistance, and has excellent high temperature resistance. Therefore, cast iron is often used to manufacture components such as cylinder blocks, piston rings, crankshafts and connecting rods of automobile engines. 3. Steel is a common metal material with good hardness, toughness and ductility. Steel is usually used in the manufacture of components such as camshafts, crankshafts, gears and transmission shafts of engines. In recent years, the application of high-strength steel has been gradually expanded, which can improve the load and safety performance while reducing the weight of the whole vehicle. Four. Alloy steel Alloy steel is a material with high strength and corrosion resistance, which is usually used in the manufacture of valves, valve seats, connecting rod pins, bearings and other components of automobile engines.These parts need to withstand high pressure and high temperature environments, so the toughness and wear resistance of alloy steel are crucial. 5. Titanium alloy is a light and high-strength metal material with a density of only half that of iron, with good corrosion resistance and high temperature strength. Titanium alloy is usually used in high-performance engines of high-end cars, and it is expensive as a material, so the application of titanium alloy for some ordinary engines still needs to be considered in terms of cost. In a word, the quality of the engine material directly affects the performance and quality of the car. The escort of automobile engine raw materials is a key point that cannot be ignored in the automobile industry. Therefore, when designing and manufacturing automobile engines, it is necessary to choose suitable materials and take strict quality control measures to ensure the high quality and safety performance of the automobile.

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