METHOD OF PRODUCTION OF COLD-ROLLED PIPES WITH SIZE VN346(40 MM FROM STEEL OF GRADE "08-18=10T-+" FOR NUCLEAR POWER ENGINEERING FACILITIES Russian patent published in 2015 - IPC B21B21/00 

Abstract RU 2547054 C2

FIELD: technological processes.

SUBSTANCE: invention relates to pipe rolling Cakes with size of 620×100×1750±50 mm are heated to temperature of 1260-1270°C and are pierced in a cross-rolling mill into bloom stocks with size of 620×vn.265×1985-2105 mm on a holder with diameter of 250 mm true to size along external diameter and drawing µ=1.17. Blooms are heated from cold or hot charging to temperature of 1260-1270°C and pierced - rolled true to size along the outer diameter into blooms with size of 620×vn.390×2630-2800 mm on the holder with diameter of 375 mm with drawing µ=1.33. Blooms are rolled on a TPU 8-16" with Pilger rolling mills into stock hot-rolled pipes with size 480×58×5500-5800 mm with clamping by diameter Δ=21.8% and drawing µ=2.37. Pipes are turned and bored into pig mechanically treated pipes with size of 470×47×5500-5800 mm with removal of metal on the outer surface at ≤5.0 mm, and along the inner surface at ≤6.0 mm, and roll them into pig hot-rolled mechanically treated pipes with size of 470×47×5500-5800 mm on a cold-pilgering mill 450 into commercial cold-rolled pipes with size of vn.346×40×6700-7200 mm with drawing µ=1.29 and clamping along diameter Δ=9.36%, roughness of internal and external surfaces Ra of not more than 2.5 mcm.

EFFECT: invention provides for reduced metal consumption.

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RU 2 547 054 C2

Authors

Saf'Janov Anatolij Vasil'Evich

Fedorov Aleksandr Anatol'Evich

Tazetdinov Valentin Irekleevich

Voronin Anatolij Andreevich

Osadchij Vladimir Jakovlevich

Golovinov Valerij Aleksandrovich

Barichko Vladimir Sergeevich

Klimov Nikolaj Petrovich

Matjushin Aleksandr Jur'Evich

Bubnov Konstantin Ehduardovich

Saf'Janov Aleksandr Anatol'Evich

Eremin Viktor Nikolaevich

Dates

2015-04-10Published

2013-07-16Filed