Hardware products refer to all kinds of mechanical parts and connectors made of metal as the main material. With the development of modern industry, hardware products have been widely used in machinery, automobile, architecture, home and other fields. So, how to evaluate the quality of hardware products? Let's talk about the quality of hardware products.

According to the customs import and export data collated by China Association of Automobile Manufacturers, in 2014, China's automobile commodity export value continued to maintain a small growth, the cumulative export value of 84.314 billion US dollars, a year-on-year growth of 7.08%. Among them, the export value of auto parts was 64.617 billion US dollars, with a year-on-year growth of 8.02%, which slightly slowed down compared with the previous year; Accounting for 76.64% of the total automobile exports, the share increased by 0.36 percentage points compared with last year.

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.