Steam Turbine Blades Steel
Introduction
Steam turbine blades are essential parts of the steam turbine, and their material properties have a direct impact on the quality, reliability and safety of turbine operations. Steam turbine blades are usually made of high-strength steels, and for this reason, the properties of the steel used must be checked carefully to ensure the safety of the device. GB/T 8732-1988 provides the material standards and specifications of the steel used in steam turbine blades.
Classification of steels used in steam turbine blades
GB/T 8732-1988 provides two kinds of steels used in steam turbine blades, which are low carbon steel and low alloy steel.
Low carbon steel
Low carbon steel is mainly used in the spindle and rotor of steam turbines, and in some occasions it can also be used in the stator and the expansion cylinder of steam turbines. This type of steel used in steam turbine blades should meet certain standards for mechanical properties, such as yield strength and impact toughness.
Low alloy steel
Low alloy steel is mainly used in the stator of steam turbines. This type of steel used in steam turbine blades should meet certain standards for mechanical properties, such as yield strength, impact toughness and fatigue resistance.
Chemical Composition
The chemical composition of both low carbon steel and low alloy steel used for the production of steam turbine blades should meet the standard of GB/T 8732-1988. The content of C, Mn, Si, P, S, Ni, Cr and Mo should be strictly controlled to ensure the high performance of the steel.
In addition, the content of impurities in the steel should also be strictly controlled. The content of phosphorus, sulfur and total oxygen should be controlled below 0.040%, 0.040% and 0.08% respectively.
Heat Treatment
The heat treatment of the steam turbine blade steel should be carried out in accordance with GB/T 8732-1988. For low carbon steel, normalizing and tempering should be carried out, while for low alloy steel, normalizing, tempering and quenching should be carried out. During heat treatment, the steel should be heated slowly, and different heat treatment processes should be strictly separated from each other.
Application
Steam turbine blades steel made in compliance with GB/T 8732-1988 is widely used in modern steam turbines. In the aerospace industry, it is used for aircraft gas turbine blades and rocket engine blades, providing improved performance for aircraft and space vehicles. In the power sector, steam turbine blades are used for electricity generation, providing higher efficiency and reliability.
Conclusion
Steam turbine blades steel should meet GB/T 8732-1988 in terms of chemical composition, mechanical properties and heat treatment to ensure the safety and reliability of the steam turbine blade. The steel used is mainly low carbon steel and low alloy steel, and can be widely used in power generation, aerospace and other industries.
