Abstract:
According to the characteristics and heat treatment process requirements for the large-sized，heavy wall and high alloy steel tubes to be produced by a certain domestic company，the technological proposal for designing the related roller-hearth bright furnace is determined. The design proposal covers such key technological points as adding front and rear vacuum chambers to prevent surface oxidization of the heavy wall steel tube due to long time heating，adopting the math model for tube heating and cooling control，and the beat type heat treatment operation mode to get the heavy wall tube heated uniformly in the normalizing furnace，and evenly cooled down as well. The actual operation demonstrates that the newly-built roller-hearth bright furnace is capable of consistent running to processing high-pressure boiler tubes with homogeneous metallographic structure and qualified consistent performance. This case is worthy referencing for construction of similar heat treatment lines.
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