Inner Combustion Engine Valve Steel (GB/T12773-1991)
Inner combustion engine valve steel, also known as valve steel, is a kind of steel specifically used for the production of valve components in internal combustion engines. The internal combustion engine uses a reciprocating piston as the power source, and the timing of the combustion process is mainly provided by the valve components mounted on the cylinder head, which requires the valve steel to have very high performance and can withstand high temperature and high pressure.
Internal combustion engine valve steel is based on a variety of stainless steel and takes into account high temperature creep and thermal fatigue resistance, oxidation resistance, corrosion resistance and high lubricity after processing. It has good hardenability and surface hardness, and its performance is maintained in a wide temperature range. According to studies, the properties of the valve steel are affected by the sulfur and phosphorus and the chemical composition of the alloying elements, the structure of the matrix, the depth and properties of the hard layer after quenching, and the size of the grain, which should be taken into consideration to obtain the best performance. Valves made from this steel are generally used at a temperature above 500℃.
Internal combustion engine valve steel of GB/T12773-1991 has average carbon content of 0.8-1.2%, average chromium content of 1.7-2.2%, average manganese content of 0.65-0.9%, average molybdenum content of 0.3-0.45%, average nickel content less than 0.5%. It also contains very little sulfur and phosphorus. Through its relatively high steel Hardness, Internal combustion engine valve steel of GB/T12773-1991 have excellent resistance to thermal fatigue, wear and tear, and very good thermal conductivity, which is suitable for producing various complex parts with a high degree of precision such as the internal combustion engine valve stem, valve seat and valve guide.
The selection of internal combustion engine valve steel needs to consider the performance requirements of the component, because the performance requirements of different internal combustion engine valve steel are significantly different in terms of wear resistance, corrosion resistance and hardenability. At the same time, the product standard national standard GB/T12773-1991 is also very important. Its main content includes chemical composition, mechanical properties and metallographic examination of the inner combustion engine valve steel, providing a certain technical requirement for the production and quality inspection of the valve.
In conclusion, Internal combustion engine valve steel of GB/T12773-1991 has suitable mechanical properties and components performance, good hardenability and surface hardness in a wide temperature range, and could withstand high temperature and pressure. It also has good wear-resistance, corrosion-resistance and thermal-fatigue resistance. So it is widely used in internal combustion engine valves. GB/T12773-1991 provides a certain technical requirement for its production and quality inspections, which is a higher standard for the dimensional tolerance and metallographic properties of the valve steel.
