Three Stages of Spiral Welded Steel Pipe Cooling

Spiral welded steel pipe plant in the production process will encounter this question, because the composition of different types of steel, their transition temperature, transition time and the characteristics of the study the same. Even if the same steel, only the end is not the same use, the needs of the arrangements and functions are not the same.
 
The secondary cooling means cooling from the temperature at the beginning of the phase transformation to the temperature at which the phase transition is completed. The purpose of the secondary cooling is to control the phase change process by controlling the cooling rate during the phase change and stopping the temperature control to ensure the required metallographic arrangement after the steel is rapidly cooled.
 
Secondary cooling (air cooling) refers to the phase change to room temperature range of cooling. On the shop in the air-cooled process will occur in the separation of carbonitride, the resulting bainite tempering occurred. On the high-carbon steel or high carbon steel alloy steel phase transformation after the air-cooled, will make the fast cooling, the separation of the super-saturated carbide dispersion continued separation. Such as the phase change is still selected after the completion of technology, you can hinder the carbide separation, adhere to the carbide solid solution, solid solution to strengthen the intention.

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