The invention discloses
pipe die
powder for centrifugally
casting a nodular
cast iron pipe and a preparation process thereof. The
pipe die
powder comprises the following components in percent by
mass: 60-65 percent of Si, 1.5-2.0 percent of Ca, 2.0-3.0 percent of Ba, 1.4-1.6 percent of Mn, 1.0-1.5 percent of Mg, 1.0-2.0 percent of Zr, 0.7-1.5 percent of Al and the balance of Fe; and the granularities of pipe die
powder comprise less than 1.5 percent of 80 mu, 25-30 percent of 100-120 mu, 40-50 percent of 140-180 mu, 25-30 percent of 200-300 mu and less than 2.5 percent of more than 300 mu. The preparation process comprises the following steps of: preparing, melting, pouring, cooling, crushing, milling, proportioning granularities and packaging in vacuum. The pipe die powder has the advantages of uniform components, consistent melting points and reasonable granulometric class, and is beneficial to the prolonging of the service life of a pipe die of the nodular
cast iron pipe, the reduction of a series of
casting defects of cockles, poor nodulizing, surface cracks and the like of the nodular
cast iron pipe, the improvement of the quality of the nodular
cast iron pipe and the yield, and the lowering of the production cost.