Thermal expansion process characteristics of seamless steel pipe

Thermal expansion process characteristics of seamless steel pipe is following:

The first process is heating: one is heating below the critical point Ac1 or Ac3; the other is heating above the critical point Ac1 or Ac3. The first is mainly to stabilize the structure of seamless steel tubes and eliminate the residual stress of seamless steel tubes. The second is mainly to austenitize the steel.

The second procedure is thermal insulation: the purpose is to heat the uniform seamless steel tube to obtain a reasonable heating of the tissue.

The third process is cooling: the cooling process is the key process for the heat treatment of the seamless steel tube and decided the microstructure and mechanical properties of the seamless steel tube after cooling. The seamless steel tube cooling method used in the actual production process is various. The commonly used cooling methods are furnace cooling, air cooling, oil cooling, polymer cooling, and water cooling.