FIELD: metallurgy.
SUBSTANCE: in fabrication method of tubes of large diametre for transportation of abrasive materials and pulps, which involves drilling of axial hole of workpiece, heating of workpiece, conversion on slant rolling mill and rolling of shell on pilger mill, workpiece is drilled to the depth equal to difference of length of workpiece and drilled diametre, which is filled with briquettes, and plate 2-3 mm thick is welded to the hole; conversion is performed by closing the briquettes by a mandrel on the plate side; at that, briquettes are made from river sand and soluble glass with further drying in the furnace and of the diametre which is less than the drilled diametre by 1-2 mm.
EFFECT: increasing hardness of inner tube surface and reducing production costs when applying various coatings to inner surface, eg corrosion-resistant coatings, when using briquettes of other compositions immediately in process tube fabrication flow.
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