FIELD: metallurgy.
SUBSTANCE: central hole is drilled in billets, and they are heated by 20-30°C below upper limit of ductility temperature of this steel grade. Billets are pierced in the mill for transverse screw rolling into true-sized shells or with a rise as to diameter of ≤9.0%. Rolled on pilger mills into pipes. End crops of continuously cast billets with a shrinkage hole are used as billets. Length of end crops is determined from the following expression: Le.c.=L3.in, where L3.i - length of a billet for rolling of pipes of i size, mm; n - numbers of billets, pcs. Diameter of the central hole is determined from the following expression: Dc.=Ds.h.+Δ, where Ds.h. - maximum diameter of the shrinkage hole in the billet, mm; Δ=35-40 - deviation of the shrinkage hole from the centre of the billet, mm.
EFFECT: increasing steel yield on a continuous pouring unit.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PRODUCING IN TUBE ROLLING PLANTS WITH PILGER MILLS SEAMLESS HOT-DEFORMED LARGE- AND MEAN-DIAMETER TUBES FOR STEAM BOILERS, STEAM PIPES AND COLLECTORS OF PLANTS WITH HIGH AND SUPER-CRITICAL PARAMETERS OF STEAM FROM INGOTS OF ELECTROSLAG REFINING AND CONTINUOUSLY CAST BILLETS | 2005 |
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| PRODUCTION OF SEAMLESS HOT-ROLLED, SMOOTH, THREADED, BOILER-ROOM, THICK-WALL AND SPECIAL-PURPOSE PIPES 273-630 MM IN DIAMETER AT PRU WITH PILGER MILLS | 2013 |
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RU2570150C1 |
