Mandrel Bars

Mandrel bar is one of the most important tools to produce large-diameter seamless steel pipe in modern tech.Because of the poor circumstance of the rolling process of seamless steel pipe,mandrel in the rolling process has to withstand large and complex stretching, high temperature thermal fatigue stress, so the requirements of the chemical composition, mechanical properties, non-metallic inclusions, grain size, microstructure, ultrasonic testing, dimensional accuracy, roughness etc is crucial. Mandrel bar mainly use H13 (4Cr5MoSiV1) material,mandrel quality and service life have reached the international advanced level of similar products, with an annual capacity of 15,000 tons .

Our major domestic users are Tianjin Pipe Corporation, Anshan Iron and Steel seamless steel companies and other manufacturers,and exports to Italy, Argentina, the United States, Russia and other countries.