Development Course and Manufacturing Technology of Mandrel Pipe Mill

Over the past four decades,the mandrel pipe mill has been developed so fast that the total annual capacity of such mills is up to 20 million tons. Elaborated in the paper are the application scope and characteristics of the mandrel pipe mill,focusing on the newly-developed technologies for quality control of the cone-type piercing mill,the 3-roll continous rolling proper and the stretch reducing mill. Also discussed is the future development trend of this type of pipe-rolling mill.