In the power industry, the choice of materials plays a crucial role in the performance, reliability, and service life of equipment. Titanium alloy plates, with their unique physical and chemical properties, have demonstrated significant advantages in various applications, including coastal thermal power plants and nuclear power plants, becoming an indispensable key material in the power industry.
Condensers: The Preferred Choice for Corrosion Resistance and Long Service Life. Coastal thermal and nuclear power plants typically use seawater as cooling water for their condensers, whose core function is to condense steam into water. Traditionally, condensers have used copper alloy tubes, such as aluminum brass tubes. However, with the rapid deterioration of the seawater environment, aluminum brass tubes face severe challenges. Seawater containing hydrogen sulfide causes severe corrosion, leading to frequent leaks and affecting the normal operation of the power plant.
Titanium alloy plate condensers stand out due to their superior corrosion resistance and long service life. Titanium alloys possess excellent resistance to chemical and electrochemical corrosion, exhibiting strong resistance to corrosion caused by seawater, sulfides, chlorides, and pitting corrosion from marine organisms and sediments.
Furthermore, they can resist accelerated corrosion caused by high-speed seawater and localized eddies. This is because the titanium surface can rapidly repair damaged protective oxide films, resulting in extremely low corrosion rates even in seawater containing silt and diamond sand with flow velocities reaching 2 m/s. Therefore, condensers made of titanium alloy plates not only increase seawater flow rates and enhance cooling efficiency but also significantly reduce maintenance costs and downtime risks, ensuring stable power plant operation.
Steam turbine blades: a model of lightweight corrosion resistance. Steam turbine blades, especially the low-pressure stages, require extremely high material performance.
In contrast, titanium alloy plates are an ideal choice for steam turbine blades. Titanium blades are lightweight, and at the same rotational speed, the centrifugal force at the blade root can be reduced by 40%, significantly lowering energy consumption and wear. Simultaneously, titanium blades exhibit far superior corrosion resistance to saline steam compared to steel, effectively preventing pitting and crevice corrosion. Furthermore, the fatigue performance of titanium alloys is significantly higher than that of stainless steel. In air, the fatigue strength of Ti-6Al-4V alloy is approximately 30% higher than that of Cr13 steel; while in sodium chloride solution, the fatigue strength of Cr13 steel decreases by 2/3 to 4/5, while the fatigue performance of titanium alloys remains largely unaffected. Therefore, under corrosive conditions, considering the superior fatigue performance, titanium alloy plates have become an important alternative to steel blades, contributing to improved steam turbine operating efficiency and reliability.
Titanium alloy plates, with their excellent corrosion resistance, high specific strength, good fatigue performance, and non-magnetic properties, have been widely used in various fields of the power industry, including condensers, steam turbine blades, and generator retaining rings. With the continuous development of the power industry and the increasing demands on equipment performance, the application prospects of titanium alloy plates will be even broader, and they are expected to make a greater contribution to the sustainable development of the power industry.
Baoji Reliab Metal Materials Co.,Ltd
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