MANUFACTURING APPARATUS OF ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN BUCKLING RESISTANCE PROPERTY

Japanese Patent JP2009285709

A

To solve a problem of not sufficiently improving buckling resistance property of an electric resistance welded tube by conventional technology.

In the manufacturing method of the electric resistance welded tube, a steel strip is roll formed while it is being passed, both abutted ends of the strip in a width direction are electric-resistance-welded to form a tube, heat treatment is applied to an electric resistance welded area, and then the tube is straightened by a rotary straightening machine. The rotary straightening machine is not a general one but one 1 having a plurality of stands and allowing the distance between these stands to be variable.

JPH06304649	METHOD AND DEVICE FOR DETECTING WELDING POSITION OF UO STEEL PIPE
JP5217773	Welding heat-affected zone High-strength welded steel pipe for low temperature with excellent toughness and tensile strength of 570MPa or more and 760MPa or less and its manufacturing method

YOKOYAMA HIROYASU
KENMOCHI KAZUHITO
SAKATA TAKASHI
INOUE TOSHIHIRO
KUMAZAWA SHINTARO

JP2008142615A

December 10, 2009

May 30, 2008

Click for automatic bibliography generation  

JFE STEEL CORP

B21C37/08; B21D3/02

JP2006231401A	2006-09-07
JPH11290947A	1999-10-26
JPH06220547A	1994-08-09
JPH106055A	1998-01-13

Eiichi Kobayashi

Previous Patent: CONTROLLER FOR BENDING MACHINE

Next Patent: MANUFACTURING METHOD OF ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN BUCKLING RESISTANCE