critical temperature
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When steel parts are subjected to annealing and normalizing treatments, they must be heated above a critical temperature. How is this critical temperature defined? Is the temperature higher than the melting point of the steel?
The critical temperature is below the melting point of the steel; it lies at +30 to 50°C above the austenite transformation temperature. One can refer to a textbook on metal materials science, where explanations based on the iron-carbon phase diagram and heat treatment are provided, making it easy to understand~