General-purpose electric-welded straight-seam steel pipes with an outer diameter of 630-1420 mm, length of 5-12 m, without longitudinal welds, with one or two longitudinal seams (for diameters of 1220 and 1420 mm), wall thickness ranging from 8 to 20 mm, and strength class K34-K38, with a test pressure up to 12 MPa, according to GOST 10706-76.