Abstract: Comparatively analyzed are the main physiochemical properties of both the Φ1 016 mm×26.2 mm induction heat-processed elbows used for Sichuan-East Gas Pipeline Project as manufactured by a domestic elbow maker and the mother pipes thereof.The result shows that the major property mean values of the elbow and the mother pipe are better than the applicable criteria for the project.Compared with the mother pipe,the elbow's strength is reduced,while its toughness is increased,and the plasticity is increased,too,but slightly.Also identified is that the property changes of different parts of the elbow vary.