A RESEARCH ON PLUGS FOR ROLLING SEAMLESS ALLOY PIPES

Piercing and elongating tests on a press-piercing mill or a elongator using various testing plugs show that 18Cr8N₂ stainless steel pipe can be rolled by the Mo alloy plug, especially by the scatteredly intensified TZM pltug which has long time service because it still has high strength under the condition of more than 1000℃ and the oxide produced on its surface can avoid over-fution