Title:
MANUFACTURE OF HIGH TOUGHNESS WELDED STEEL TUBE
Document Type and Number:
Japanese Patent JPH01230716
Kind Code:
A
Abstract:
PURPOSE: To improve the toughness of the resistance welded part of a resistance welded tube by successively subjecting the resistance welded part to heating to a specified temp., specified working in a temp. range below the recrystallization temp. of austenite and cooling to a specified temp. at a specified cooling rate.
CONSTITUTION: The resistance welded part of a resistance welded tube made of low carbon steel or low carbon low alloy steel is heated to the Ac3 pointW1,050°C, worked at 1W90% rate in a temp. range below the recrystallization temp. of austenite, immediately cooled to 600W800°C at 10W150°C/sec cooling rate and allowed to cool. The toughness of the resistance welded part of the resistance welded tube can be improved.
Inventors:
OTAKE TAKAYUKI
TAKAMURA TOSHIHIRO
ATAYA TAKESHI
SUGAMASA TETSUAKI
SUZUKI SEIJI
KOJIMA SHINJI
TAKAMURA TOSHIHIRO
ATAYA TAKESHI
SUGAMASA TETSUAKI
SUZUKI SEIJI
KOJIMA SHINJI
Application Number:
JP5253188A
Publication Date:
September 14, 1989
Filing Date:
March 08, 1988
Export Citation:
Assignee:
NIPPON KOKAN KK
International Classes:
C21D8/10; (IPC1-7): C21D8/10
Attorney, Agent or Firm:
Takehiko Suzue (2 outside)