Toughness of Carbon-0.5% Molybdenum Steel
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- Category: Molybdenum knowledge
- Published on 16 July 2013
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Although carbon-0.5% molybdenum (C-0.5% Mo) steel is widely used as a material for pressure vessels in petroleum refining and related process plants, there have been instances of reactor vessels rupturing due to the extremely low initial toughness of the material.
Hence, the objective of the current research has been to investigate the effects of heat history on the initial toughness and ultrasonic attenuation characteristics of C-0.5% Mo steel. As a result, it has been found that initial toughness depends greatly on aluminum content and the rate of cooling from normalizing temperature.
And that the smaller the ferrite grain diameters and the higher the bainite content due to faster cooling from the normalizing temperature, the higher the toughness of the material. Furthermore, a relationship between ultrasonic attenuation and toughness is evident whereby the higher the ultrasonic attenuation coefficient of the material, the lower the toughness.
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