During the operation of the steam turbine, the high-pressure inlet pipe of the high-pressure cylinder plays a crucial role. The main function of these pipelines is to transport the high-temperature and high-pressure steam generated by the boiler to the high-pressure cylinder, causing the steam to expand inside the cylinder and do work on the rotor, thereby driving the generator to rotate and generating electricity. Due to the extremely high pressure and temperature of steam, the high-pressure inlet pipe and its bolts must be able to withstand enormous mechanical stress while also resisting the effects of thermal expansion and contraction.

The bolt of the high-pressure inlet pipe of the high-pressure cylinder is a key component that connects the pipeline to the high-pressure cylinder, and they need to withstand enormous pressure and high temperature environments. Therefore, the selection of bolt materials is crucial. 45Cr1MoV is a high-performance alloy steel widely used in the manufacturing of high-pressure inlet pipe bolts for steam turbine high-pressure cylinders due to its excellent mechanical properties and heat resistance.

45Cr1MoV steel material has good mechanical and heat resistance properties and is commonly used in the manufacturing of components for high-temperature and high-pressure equipment. In terms of corrosion resistance, 45Cr1MoV has a certain degree of corrosion resistance, but it is not a material specifically designed for corrosive environments. Therefore, in highly corrosive environments, especially in the presence of chemical corrosion factors, the corrosion resistance of 45Cr1MoV bolts may not be as good as that of materials specifically designed for corrosive environments.

In terms of service life, 45Cr1MoV material can maintain good mechanical properties and structural stability in high-temperature and high-pressure environments, so bolts can have a longer service life. However, the actual service life is influenced by various factors, including corrosion, fatigue, thermal aging, and so on. Therefore, in practical applications, it is necessary to regularly inspect and maintain bolts according to specific working conditions and environmental factors to ensure their safe and reliable operation, and replace them as needed.

In summary, the selection and application of high-pressure inlet pipes and their bolt materials for high-pressure cylinders is a complex process that requires comprehensive consideration of multiple factors such as mechanical performance, heat resistance, corrosion resistance, and service life. The correct material selection and strict manufacturing process can ensure the safe, efficient, and reliable operation of steam turbines under extreme conditions.

Yoyik can offer many spare parts for power plants as below:

Steam turbine Reamer Screw
Coal mill Wear plate 200MG41.11.09.71
Steam turbine RETAINER RING
Generator Air enclosure sealing
Coal mill Automatic reversing valve SWQ-80B
Steam turbine CV stem
Steam turbine Coupling cover fixing screw
Steam turbine Cone sleeve
Steam turbine Barring gear device
Coal mill Steel wire rope upper armor ZGM95-17-2
Steam turbine single-tongue check valve
Induced draft fan Motor side coupling DTSD60FM002
Steam turbine Medium pressure regulating valve combined with face nut
Steam turbine HP inner casing with grooved special nut
Coal mill Filter MG20.20.03.02