In the installation and maintenance of high-pressure diaphragms in steam turbines, the fastener hex bolt 20Cr1Mo1V1 plays an indispensable role. In the high-temperature and high-pressure environment of the steam turbine, the 20Cr1Mo1V1 hexagonal bolt can withstand huge torque, maintain stable fastening performance, and ensure the safe connection of the high-pressure diaphragm. In addition, the heat resistance and corrosion resistance of 20Cr1Mo1V1 enable it to operate stably in harsh working environments for a long time, resist the corrosion of the medium, and ensure the safe operation of the steam turbine.

However, even the highest quality bolts can experience wear and tear due to long-term operation. Therefore, regular inspection and replacement of worn bolts are important maintenance measures to ensure the safe operation of the steam turbine.

Firstly, it is necessary to develop a detailed maintenance plan. This plan should include a bolt inspection and replacement cycle, which needs to be determined based on the bolt’s usage conditions, working environment, and manufacturer’s recommendations.

Secondly, it is very important to follow the inspection standards and methods provided by the manufacturer. This usually includes visual inspection, dimensional measurement, hardness testing, and ultrasonic testing. Use appropriate tools and equipment for bolt inspection, such as magnifying glasses, calipers, hardness testers, and ultrasonic testers.

It is also necessary to record the results of each inspection, including the size, torque, wear condition, etc. of the bolts. This helps to monitor any potential degradation trends and take timely action when necessary.

When the bolt meets the manufacturer’s recommended replacement standards or shows obvious wear, cracks, deformation, etc., it should be replaced immediately. When replacing, it is necessary to use bolts that meet the specifications and meet the quality standards to ensure performance and safety.

During the inspection and replacement process, it is important to ensure a clean working environment to avoid contamination and corrosion. At the same time, necessary technical training should be provided to maintenance personnel to ensure that they understand the correct methods of bolt inspection and replacement.

If serious problems are found with the bolts during the inspection process, immediate measures should be taken, such as adding temporary support or emergency replacement, to prevent equipment failure.

Yoyik can offer many spare parts for power plants as below:
Generator Manifold assembly (steam end)
Steam turbine FILTER MINIFOLD
Coal mill Nozzle stationary ring 20MG43.11.08.99J
Steam turbine DOWEL KEY
Steam turbine WINDOW CAP
Generator Rotor wedge assembly
Generator Mechanical seal
generator oil baffle gasket
LP Casing manhole door bolt 20Cr1Mo1V1 Steam Turbine Regulating steam valve
SHAFT 50Mn18Cr5Mo3VN Steam Turbine High Pressure Cylinder
Bearing 20Cr3MoWV Steam Turbine High pressure combined valve
BEARING BODY ZG35 Steam Turbine IP diaphragm
Bearing 1 ZG25 Steam Turbine High Pressure Cylinder
Bearing 2 40Mn18Cr4V Steam Turbine HP cylinder