Study on Distribution of Heat Treatment Temperature Field of Long distance Oil and Gas Pipeline with High Steel Grade

Abstract

In-service welding repair is important to ensure natural gas pipelines’ safe and reliable operation. The temperature distribution in the welding heat treatment process directly affects the pipeline’s bearing capacity and local stress distribution. This study studied the temperature distribution of a high steel pipeline generated by the heat treatment process for the long-term transportation of oil and gas was studied experimentally. The medium frequency induction heating method is applied to heat the tube body by winding a heating belt on the outer wall of the steel pipe to simulate pre-welding and post-welding heat treatment. At the same time, a thermocouple is used to record the temperature change of each position during the whole heating process to obtain data. Through numerical analysis and fitting, the distribution law of the temperature field in the heat treatment process of steel pipe is established to guide the field heating temperature control.