1. Sintered metal is a Powder metallurgical iron-based products made of pre-alloyed steel powder or mixed powder as material.

2. Sintered steel consists of sintered carbon steel and alloy steel. Sintered steel is made by powder metallurgy method. The materials or products are produced by confining the steel powder to form and sintering. The commonly used method of sintered steel products is metal injection moulding. The very fine steel powder is mixed with a fixed proportion of plastic binder and then injected into the mould to form a semi-manufactured part with any shape. Products, such as gears, bearings, or case. This process is similar to plastic injection moulding, but the injection temperature is slightly higher, but still lower than 200 degrees C. Then semi-finished products are put into a high temperature furnace with temperature exceeding 1000 degrees C, which can burn off plastic adhesives while steel remains.