FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Hollow ESR 740×out490×2650±50 mm ingots are bored and turned to 720×out510×2650±50 mm ingots-billets. The latter are heated to 1260-1270°C and blown with compressed air or inert gas. Said ingots-billets are lubed from inside at both ends with the mix of graphite with table salt (50:50) in amount of 1500-2000 g. Said ingots-billets are rolled at Pilger mill at 660 mm gage made in rolls with body diameter of 1150 mm to rerolled 650×36×6200-6500 mm pipes at taper 581/587 mm diameter mandrel with finishing factor Kn = 6.0-6.5, rolling-out factor µn = 2.86 and diameter reduction Δ = 9.7%. Rerolled pipes are bored and turned to commercial seamless hot-strained 630×16×6200-6500 mm pipes with diameter allowance of ±0.8% and wall allowance of ±10%.
EFFECT: decreased metal consumption factor.
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