Carbon Steel Structural Parts For Staeam Turbine Cylinder

Carbon steel structural parts for steam turbine cylinder are core parts that bear the key pressure-bearing and structural support functions in steam turbines. They are mainly made of carbon steel. Through reasonable carbon content ratio (usually carbon content is between 0.1% and 0.45%) and alloy elements, they have good strength, toughness and processing performance. The structural design of such components needs to adapt to the complex working conditions of steam turbine cylinders. Common forms include cylinder shells, flanges, bolted connection sections, etc. The surface is often precision-machined to ensure the flatness and finish of the sealing surface to prevent steam leakage.

During the operation of steam turbines, Carbon steel structural parts for steam turbine cylinders need to withstand multiple tests of high temperature, high pressure and alternating loads, so the creep resistance, oxidation resistance and fatigue strength of the material are extremely high. For example, the components of the low-pressure cylinder need to resist corrosion in a wet steam environment, and carbon steel containing elements such as manganese and silicon is often used; while the high-pressure cylinder connection flange needs to optimize the carbon content and heat treatment process (such as normalizing and tempering) to improve its yield strength and fracture toughness.

During the manufacturing process, carbon steel structural parts need to go through multiple processes such as casting or forging blanks, machining, non-destructive testing (such as ultrasonic testing, magnetic particle testing) and surface treatment to ensure that there are no defects such as pores and cracks inside the components. Its assembly accuracy directly affects the efficiency and safety of the steam turbine. For example, the flatness error of the cylinder center face must be controlled within 0.05mm, and the concentricity deviation of the flange bolt hole must not exceed 0.1mm. As an important component of the turbine casing, carbon steel structural parts not only provide installation support for internal rotors, partitions and other components, but also achieve sealing and flow guidance of the steam flow channel through reasonable structural design. They are basic components to ensure the stable operation of the steam turbine.