As the foundation of automobile industry, auto parts are the necessary factors to support the sustainable and healthy development of automobile industry. In particular, the independent development and innovation carried out in the automobile industry with vigour and vitality needs a strong parts system as support.

Throttle body, engine, engine assembly, oil pump, nozzle, tension wheel, cylinder block, bearing bush, water pump, fuel injection, gasket, camshaft, valve, crankshaft, connecting rod assembly, piston, belt, muffler, carburetor, fuel tank, water tank, fan, oil seal, radiator, filter

Metal products are indispensable products in modern industry and life. How to distinguish their quality is the problem we need to pay attention to when we buy and use them. This paper will discuss the quality discrimination method of metal products from the aspects of metal material quality, production process, surface treatment, structure design, function and so on.

Metal products refer to all kinds of practical or decorative products made from metal materials. Metal products can be used in various fields, such as construction, aviation, automobile, industrial manufacturing, medical, metallurgy, electronics and other industries, widely used in a variety of production and daily life.