In the 1980s and 1990s, due to the requirements of foreign businessmen, several companies in Zhejiang produced foreign trade 45 steel taps and dies, which were used for cutting soft materials such as plastics, copper, and aluminum. Requires overall quenching, hardness 53.5 -60HRC. The annealing heat treatment of 45 steel taps is not as easy to process as high-speed steel taps. It is difficult to process mainly in three aspects: easy to deform and crack (there is a critical quenching dangerous size problem), poor quality stability, and easy to rust.
After practice, Zhengzhou Gao's electromagnetic induction heating equipment manufacturer believes that as long as the two key issues of quenching fixture and quenching medium are solved, other problems will be easily solved.
The quenching heating temperature is not easy to be too high. Generally, 820-830℃ is used. The furnace capacity cannot be too much, which is basically only 50 degrees for high-speed steel of the same specification. The cooling medium cannot be salt water, let alone oil, but a two-nitrate quenching agent, that is, 25%NaN02+25qoNaN03+50% water (mass fraction), use temperature <70gC.
If the hardness after quenching is lower than 53HRC, the reason should be found out and tested again.
Tempering is carried out in nitrate salt: 150 - 160℃ x lh x l times, clean after tempering. After heat treatment, the 45 steel taps are phosphated and leave the workshop.
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GS-ZP-1200
