FIELD: metallurgy.
SUBSTANCE: casting the hollow ingots is carried out with electroslag remelting, boring and turning them into hollow ingot-billets, heating ingot-billets in a methodical furnace, rolling them on a pilgrim mill, and then rolling mechanically processed billets in a CRP mill into commodity pipes as described in the formula routes.
EFFECT: reducing the metal consumption, the roughness of the outer and inner surfaces, increasing the length of the pipes.
3 cl, 1 tbl
