Reduced metal consumption in hot pipe rolling

Abstract

Means of reducing the metal consumption in the hot rolling of seamless pipe are considered. The most common is the use of square or round continuous-cast billet. The trimming required for Pilger mills may be reduced by preparation of the front ends of the sleeves in skew rolling and rolling of the rear end at the free section of the mandrel. To expand the range of pipe to D/S = 15–30 for the 200 system with a three-roller mill, grooves created with special liners in the gaps between the rollers have been adopted at OAO Interpipe Nizhnedneprovskii Truboprokatnyi Zavod. In addition, the wall thickness is regulated by means of a hydromechanical clamp.