FIELD: metallurgy.
SUBSTANCE: method includes drilling in the billets of the through hole with diameter 100±5 mm, heating to temperature of mouldability, piercing at the helical rolling mill to hollow thick-wall shells with rise along diameter, heating of thick-wall shells from cold or hot fit to temperature of mouldability, piercing-rolling at helical rolling mill of the thick-wall shells, rolling of thin-wall shells to said pipes at Pilger mills. Billets length for piercing is specified by the mathematical expression.
EFFECT: lower metal input, higher precision of pipe wall and diameter sizes.
4 cl, 1 tbl
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RU2522514C1 |
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Authors
Dates
2015-05-10—Published
2013-06-28—Filed