What is the thermal conductivity of X52 line pipe?

Thermal conductivity range based on material properties
X52 pipeline pipes are mainly made of carbon steel or alloy steel. Generally speaking, the thermal conductivity of carbon steel is about 40-50W/(m・K), and the thermal conductivity of alloy steel varies depending on the type and content of alloying elements, but is usually around this order of magnitude.
The influence of production process on thermal conductivity
Rolling process: During the rolling process, if the steel is subjected to a large degree of cold working deformation, the grain structure inside the metal will change, more lattice defects will be generated, etc., thereby reducing the thermal conductivity to a certain extent. For example, the thermal conductivity of cold-rolled X52 pipeline pipes may be slightly lower than that of hot-rolled ones.
Heat treatment process: Annealing treatment can make the structure of steel more uniform, reduce internal stress, and help improve thermal conductivity; while strengthening heat treatment such as quenching may cause a decrease in thermal conductivity due to the formation of new phase structures or increased structural inhomogeneity.
The influence of temperature on thermal conductivity
When the temperature rises, the thermal conductivity of X52 pipeline pipes usually shows a trend of first slightly rising and then falling. At room temperature to around 200°C, the thermal conductivity may increase slightly; when the temperature exceeds 300°C or even higher, the thermal conductivity will gradually decrease as the internal structure of the steel changes.