Martensitic stainless steels are generally quenched. For example, when used as a tool steel, the hardness must be increased by quenching. However, martensitic steel is also widely used in structural steel. At this time, heat treatment must be selected for quenching and tempering (quenching + tempering). For tempering of martensite, some details must be paid attention to.
1. Martensitic stainless steel has temper brittleness. Therefore, the cooling rate and tempering temperature during tempering must be properly selected.
2. The first type of temper brittleness depends on the tempering temperature, so it cannot be tempered within a certain temperature range. Secondly, the corrosion resistance also becomes very bad in a certain tempering temperature range. Since the temperature range of the first type of temper brittleness and corrosion resistance is substantially the same, it is necessary to avoid returning within this temperature range. fire.
3, the second type of temper brittleness, when the tempering temperature is slowly cooled, the impact value decreases. When this kind of steel is used as structural steel, great attention is paid to the impact value. Therefore, the cooling rate of tempering must be changed with the required mechanical properties.
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