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Induction heating of steel temperature curve. From the curve, we learn that before and after the hot steel surface temperature and core temperature are not one, that is, there is a temperature difference. Below the Curie temperature radial temperature is greater than the temperature above the Curie point. It can be argued that when using high frequency induction heating furnace for induction heating steel, steel radial temperature difference occurs mainly in 750 "c the following temperature range. That occurred in induction heating tempering temperature range. Therefore, large-size steel rods and thick-walled steel pipe for induction heating tempering process, should pay particular attention to temperature issues.
When heated above the Curie point, core temperature than the surface temperature, far below the Curie point temperature values to the following. Quenching temperature difference that appears to allow reasonable temperature, usually around 20 c, no performance impact on hardened steel. However, strict performance requirements for heat treatment of steel, should also take measures to narrow the temperature before quenching.
When using high frequency induction heating furnace for induction heating steel, steel heating temperature control combined with heat treatment depends on the purpose. Softening annealing process of cold-drawing process of steel, allowed a certain degree of temperature difference is favorable. For example, 30mm diameter of cold drawn steel GCr15, 15 "heating C-s-l heating rate to 800" c annealing at, if radial temperature difference T=0 is required, need some hot 107s: allowing T=50 ℃, heat time was shortened to 28s, and not lower steel cold drawn plastic. However, because heating time 79S, the corresponding 73% lower power consumption, output also increased by 73%.
Therefore, for annealing of cold-drawn steel, temperature difference between the heating stops allowed larger, usually at 50 ℃. For tempering quenching and tempering of steel when heated, steel radial temperature difference should be strictly controlled, and should normally be controlled in 10~20℃.