FIELD: rolled tube production, namely mean and large diameter hot rolled tubes of hard-to-form steels and alloys.
SUBSTANCE: method comprises steps of drilling and boring ingots of electroslag refining to hollow ingot-sleeves whose inner diameter exceeds by 40 -50 mm diameter of drift of pilger mill; heating then until yielding temperature and rolling hollow ingot-sleeves in pilger mills to hot rolled tubes; expanding heated until yielding temperature drilled ingots of electroslag refining to hollow billet-sleeves with elongation factor μ = 1.2 - 1.8 without increasing according to diameter; turning them and boring for removing forging flaws; heating up to yielding temperature and rolling in pilger mills at elongation factor μ = 5.0 or less or expanding drilled ingots of electroslag refining to hollow billet-sleeves at elongation factor μ = 0.9 -1.5 increased according to diameter from 1.05 up to 1.4; rolling in pilger mills at elongation factor μ = 5.5 or less.
EFFECT: lowered metal consumption, lowered cost of hot rolled tubes, improved quality of tubes, enhanced operational reliability of pilger mills.
2 cl, 1 tbl
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