一、大型无缝管的生产周期式或旋转锻压式无缝管生产方法,始于十九世纪的最后二十五年。由于用较高级金属生产较优质钢管的需求一直在增长,这种方法多年来仍然在发展,并继续着。周期轧管法最大的优点之一是它的灵 First, the production of large seamless pipe cycle or rotary forging seamless pipe production methods, began in the last twenty-five years of the nineteenth century. This method has evolved over the years and continues, as the demand for producing better quality steel pipes from higher metals has been growing. One of the biggest advantages of the periodic tube rolling method is its spirit