Optimization of a technology for producing electric-welded spiral-seam pipes with helical corrugations

The Il'ich Zhdanov Metallurgical Plant collaborated with the O. E. Paton Institute to develop a technology for producing electric-welded spiral-seam pipes measuring 630 X 8 mm. The pipes were made of steel VSt3sp5 with helical corrugations. The have reduced lengthwise stiffness and compensate for axial strains due to temperature changes, internal pressure, and other factors. Existing equipment was modernized and improved and a modified multistand shaping-bending machine to shape the corrugations was developed along with a device to size the ends. Substantial savings can be realized through the use of the new pipes in the construction of lines for power plants and gas and oil transport at pressures up to 5.5 MPa.