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2 484 149

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(51)

IPC

C21D9/50(2006-01-01)

C21D9/08(2006-01-01)

C21D1/10(2006-01-01)

(21) (22)

Application

2011151592/02, 2011-12-16

(24)

Start date

2011-12-16

(22)

Actual filing date

2011-12-16

(45)

Published

2013-06-10

(72)

Inventor

Belov Evgenij ViktorovichEfimov Ivan Vasil'EvichPejganovich Nadezhda Valer'EvnaSilin Denis Anatol'Evich

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Metallurgicheskij Zavod"

METHOD OF THERMAL TREATMENT OF WELDED TUBES Russian patent published in 2013 - IPC C21D9/50 C21D9/08 C21D1/10

Abstract RU 2484149 C1

FIELD: metallurgy.

SUBSTANCE: proposed method comprises the steps that follow. First, tube weld seam and seam area is heated to temperature of [(Ac₃+α×V^1/2)÷(Ac₃+α×V^1/2+50°C)]. Then, water cooling and tempering with air cooling are performed. Then, all tube is heated to (Ac₁÷Ac₃) or to [Ac₃÷(Ac₃+50°C)], cooled by water and tempered at high temperature. Note here that weld seam and seam zone tempering and tube heating for high-temperature tempering are performed at (500°C÷Ac₁).

EFFECT: lower costs and electric power consumption.

3 cl, 2 dwg

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RU 2 484 149 C1

Authors

Belov Evgenij Viktorovich

Efimov Ivan Vasil'Evich

Pejganovich Nadezhda Valer'Evna

Silin Denis Anatol'Evich

Dates

2013-06-10—Published

2011-12-16—Filed