FIELD: metallurgy.
SUBSTANCE: hollow ESR ingots-billets are cast, heated to ductility temperature at Pliger mills on taper mandrels with the angle of generatrix inclination of mandrel axis α=2.7-3.1 minutes. Roll ring groove has reducing, squeezing and finishing sections, section of lengthwise taper section and idle section that make the roll pass. Finishing section has tangential tapers with 25-28° angles of oval, central parts of which being limited by radii equal to 1.10-1.12 of hot-rolled pipe radius. Said ESR ingots-billets at cast to different sizes with diameter-to-wall depth of 4.4-6.0. Pipe rolling at Pilger mills is performed with rolling-out µ of 1.6-6.2, larger sizes being related to smaller diameter pipes.
EFFECT: lower metal input, higher pipe working properties.
4 cl, 2 tbl
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RU2522512C1 |
