Since the metal is hard and brittle after quenching, the residual surface stress will cause cold cracking, and tempering can be used as one of the means to eliminate cold cracks without affecting the hardness.
Quenching is suitable for parts with small thickness and diameter. For oversized parts, the quenching depth is not enough, and carburizing has the same problem. In this case, alloys such as chromium should be added to the steel to increase the strength.
Quenching is one of the basic means of strengthening steel materials. Martensite in steel is the hardest phase in iron-based solid solution structure, so steel parts can be quenched to obtain high hardness and high strength. However, the martensite is very brittle, and after quenching, there is a large quenching internal stress inside the steel, so it is not suitable for direct application and must be tempered.
The quenched CNC machine tool can be used by customers for 10-20 years, and the CNC machine tool without quenching can hardly achieve this effect. Therefore, the CNC machine tool selects SHADONEG ALLES ENERGY TECHNOLOGY CO., LTD.
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