| 摘要 |
FIELD: metallurgy.SUBSTANCE: from alloy "??43????-??" initially melting is performed in VI furnaces at temperature 1500-1520°C to produce consumable electrode, then vacuum-arc remelting of the consumable electrode is performed in VA furnaces to produce ingot of double vacuum melting, i.e. IA-ingot. Then hot deformation of IA-ingot is performed in horizontal press with pre-heating in ring heating furnace to produce intermediate billet ? 95 mm, in semi-continuous medium/small schedule rod mill "350/250" the pipe billet ? 65 mm is produced, it is turned at screw lathe to ? 57 mm. Internal hole ? 40 mm or ? 51 mm is drilled through full length of the pipe billet producing shell. Drill rotation speed, drill longitudinal feed are specified, then shell is rolled by at least two passes using pipe cold roll mills CPR-55 and CPRR 30-60 or at least by four passes using mills CPR-55, KPW-50 and CPR-30. The heat-resistant seamless pipe has hollow profile of permanent cross-section of off-gage length of specified size, and is made out of alloy "??43????-??" with specified composition.EFFECT: possibility to prevent cracks, blisters, folds.18 cl |
