Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
THICK-WALLED ELECTRIC-RESISTANCE-WELDED STEEL PIPE AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/027779
Kind Code:
A1
Abstract:
A thick-walled electric-resistance-welded steel pipe which has a low Y/T that prevents buckling when the steel pipe is deformed by bending and straightening and which further has excellent low-temperature toughness. The steel pipe is characterized by having a wall thickness/outer diameter ratio of 4.0-7.0%, containing, in terms of mass%, 0.06-0.15% C, 1.00-1.65% Mn, and 0.005-0.030% Nb, and having a value of Ceq ([C]+[Mn]/6+([Cr]+[Mo]+[V])/5+([Ni]+[Cu])/15) of 0.32-0.43. The steel pipe is further characterized in that the metallographic structure contains polygonal ferrite in an areal proportion of 50-92%, the polygonal ferrite having an average grain diameter of 15 µm or smaller, and that the seam part thereof has a hardness Hv of 160-240 and has a structure comprising fine-grain ferrite and pearlite or comprising bainite. [C], [Mn], [Cr], [Mo], [V], [Ni], and [Cu] are the contents [mass%] of C, Mn, Cr, Mo, V, Ni, and Cu, respectively.

More Like This:
JPS5819726[Title of the Invention] A process of steel for electric griddles which carried out vacuum processing by a molten state
WO/2020/026385WELD METAL AND SOLID WIRE FOR SUBMERGED ARC WELDING
JP5263012Non-oriented electrical steel sheet and its manufacturing method
Inventors:
SHINOHARA YASUHIRO (JP)
ASAHI HITOSHI (JP)
NAGAI KENSUKE (JP)
Application Number:
PCT/JP2012/071226
Publication Date:
February 28, 2013
Filing Date:
August 22, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
SHINOHARA YASUHIRO (JP)
ASAHI HITOSHI (JP)
NAGAI KENSUKE (JP)
International Classes:
C22C38/00; B21C37/08; C21D8/10; C22C38/14; C22C38/58
Domestic Patent References:
WO2009014238A12009-01-29
Foreign References:
JP2009270197A2009-11-19
JP2005290546A2005-10-20
JPH07216500A1995-08-15
JPH03211255A1991-09-17
JPS63227715A1988-09-22
JPH08337816A1996-12-24
Other References:
See also references of EP 2752499A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Download PDF:
View/Download PDF      PDF Help
Claims:



 
Previous Patent: CHEMICAL HEAT STORAGE MATERIAL, MANUFACTURING METHOD THEREFOR AND CHEMICAL HEAT STORAGE STRUCTURE

Next Patent: ANONYMIZATION DEVICE, ANONYMIZATION METHOD, AND RECORDING MEDIUM IN WHICH PROGRAM THEREFOR IS RECORD...