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2 221 057

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IPC

(21) (22)

Application

2001133972/02, 2001-12-13

(24)

Start date

2001-12-13

(22)

Actual filing date

2001-12-13

(45)

Published

2004-01-10

(72)

Inventor

Fedorov A.A.Saf'Janov A.V.Ignat'Ev V.V.Romantsov I.A.Pljasunov V.A.Mazanik V.F.Zhuchaev V.A.

(73)

Holder

Oao Truboprokatnyj Zavod"

METHOD OF PRODUCTION OF WELDED TUBES OF LARGE DIAMETER Russian patent published in 2004 - IPC

Abstract RU 2221057 C2

FIELD: tube rolling industry; production of tubes of large diameter by welding. SUBSTANCE: prior to rolling, welded seam is heated in inductor to temperature AC₃ (120-200) C and after rolling, welded seam and zone of thermal effect are heated in inductor to temperature of AC₃ (80-100) C and are hardened in water sprayer at rate of cooling of (70-100) C per second and are tempered at temperature of AC₁ 930-80) C. EFFECT: avoidance of instability of mechanical properties (impact strength) of welded joint and thermal effect zone to level of parent metal; avoidance of ovalization of tube ends. 2 cl, 1 tbl

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RU 2 221 057 C2

Authors

Fedorov A.A.

Saf'Janov A.V.

Ignat'Ev V.V.

Romantsov I.A.

Pljasunov V.A.

Mazanik V.F.

Zhuchaev V.A.

Dates

2004-01-10—Published

2001-12-13—Filed