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低温容器是我厂的主要产品,其中M16～M32紧固螺栓用35CrMo 钢制造,使用温度为室温到-90℃,其机械性能要求如表1所示。由于螺栓整个截面上承受均布的拉应力,因此要求完全淬透,使整个截面的性能均匀。这些螺栓过去曾采用860℃加热、20号机油中淬火,φ25mm 以上的坯料往往淬不透,低温冲击值达不到要求;改用860℃加
The low temperature container is the main product of our factory. The M16 ~ M32 fastening bolts are made of 35CrMo steel. The working temperature is from room temperature to -90 ℃. The mechanical performance requirements are shown in Table 1. Due to the entire cross-section of the bolt to withstand uniform tensile stress, thus requiring complete hardening, the performance of the entire cross-section uniform. These bolts have been used in the past 860 ℃ heating, quenching on the 20th oil, φ25mm above the billet is often quenching impermeable, low temperature impact value does not meet the requirements; switch to 860 ℃ plus