Alloy Steel Tube Knowledge: 15CrMoG Alloy Steel Tube Mechanical Properties Application Standard Tensile Strength
15CrMoG 15CrMo steel is a widely used steel in the power industry and has a high thermal performance at 500°C-550°C. When the use temperature is greater than 550°C, its thermal strength performance is significantly reduced. Usually 15CrMo steel is mainly used for high and medium pressure pipelines with steam parameters of 510°C, steam pipes, and heat pipes with a wall temperature of 550°C.
Foreign steels of the same type include 15XM from the former Soviet Union, T12, P12 from the United States, STBA22 from Japan, STPA22 from Japan, and 13CrMo44 from Germany.
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The normal microstructure of 15CrMo steel is ferrite plus pearlite. During the long-term operation of 15CrMo steel at a working temperature of 500°C to 550°C, it will produce spheroidizing pearlite, alloying elements between solid solution and carbide. With the redistribution and the change of the carbide phase structure, the thermal strength and mechanical properties of 15CrMo steel gradually decreased as the pearlite spheroidization degree and the solid solution as the degree of depletion of the alloying element increased, so that the material gradually deteriorated or even failed. Therefore, the degree of pearlite spheroidization in 15CrMo steel structures has long been widely used as one of the important criteria for determining the reliability of such steels.
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