Complete annealing process for seamless steel tubes
The seamless annealing of the seamless steel pipe is to heat the hypo-eutectoid steel to 30~50 °C above the Ac3 temperature, and to the temperature range of about 50 °C above the Ac1 temperature by the eutectoid steel, and maintain sufficient time at this temperature to become Vostian. After the single-phase structure (hypo-eutectoid steel) or
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