Abstract
The influence of heat treatment on the properties of martensitic stainless steel used in the Control Rod Drive Machine (CRDM) of Pressurized Water Reactor was analyzed. The mechanical properties and magnetic properties of martensitic stainless steel are significantly impacted by the heat treatment, especially the tempering temperature. Taking martensitic stainless steel X12Cr13 and X3CrNiMo13–4 for examples, by comparing different heat treatment rules, the results indicate that the heat treatment can change the ratio of austenite structure contained in the martensitic stainless steel, consequently change the mechanical properties and magnetic properties of the material. The increased ratio of austenite leads to better toughness, lower strength, and lower magnetic properties. It proves that the optimal tempering temperature for martensitic stainless steel X3CrNiMo13–4 is between 560°C and 600°C to obtain excellent toughness, and the required magnetic properties can be achieved by taking the tempering temperature close to the lower limit.
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