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2 153 011

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IPC

(21) (22)

Application

99121901/02, 1999-10-18

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Start date

1999-10-18

(22)

Actual filing date

1999-10-18

(45)

Published

2000-07-20

(72)

Inventor

Brizhan A.I.(Ru)Grekhov A.I.(Ru)Zhukova S.Ju.(Ru)Zhukov A.I.(Ru)Krivosheeva Antonina AndreevnaMarchenko L.G.(Ru)Popovtsev Ju.A.(Ru)Usov V.A.(Ru)Shepelev A.V.(Ru)

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Trubnyj Zavod"

METHOD OF MANUFACTURING PIPES FROM CARBON AND LOW-ALLOYED STEELS Russian patent published in 2000 - IPC

Abstract RU 2153011 C1

FIELD: manufacture of pipes. SUBSTANCE: method relates to technology of hardening oil assortment pipes directly in line of pipe-rolling plant. Round billets upon leaving the rolling mill have temperature of 930-950 C. Pipes with this temperature are cooled in two states: at cooling rate of 60-85 C/s up to temperature of 690-720 C and at cooling rate of 3-10 C/s up to temperature of 580-680 C. Then pipes are heated to temperature Ac₃ ± 30 C and finally deformed in sinking mill with subsequent cooling in the air. The method application results in improved pipe strength and ductile properties. EFFECT: higher efficiency. 1 tbl

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RU 2 153 011 C1

Authors

Brizhan A.I.(Ru)

Grekhov A.I.(Ru)

Zhukova S.Ju.(Ru)

Zhukov A.I.(Ru)

Krivosheeva Antonina Andreevna

Marchenko L.G.(Ru)

Popovtsev Ju.A.(Ru)

Usov V.A.(Ru)

Shepelev A.V.(Ru)

Dates

2000-07-20—Published

1999-10-18—Filed