Global Patent Index - EP 2404681 B1

EP 2404681 B1 20181107 - METHOD OF PRODUCING STEEL WIRE

Title (en)

METHOD OF PRODUCING STEEL WIRE

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES STAHLDRATES

Title (fr)

PROCÉDÉ DE FABRICATION DE FIL D'ACIER

Publication

EP 2404681 B1 20181107 (EN)

Application

EP 10748749 A 20100302

Priority

  • JP 2010053352 W 20100302
  • JP 2009047890 A 20090302

Abstract (en)

[origin: EP2404681A1] Provided is a production method in which a steel having a good tensile strength can be produced with a small processing energy. The method is a method of producing a steel wire, the method including: a pre-drawing process in which a high-carbon steel wire containing 0.90 to 1.20% by mass of carbon is subjected to a drawing to obtain an intermediate wire; a heat treatment process in which the intermediate wire is subjected to a patenting heat treatment to obtain a heat treated wire; and a final drawing process in which the heat treated wire is subjected to a drawing to obtain a steel wire, wherein the amount µf of drawing in the final drawing process which satisfies the relation represented by the following formula: µf = 2 ln D ¢ 0 / Df (wherein Df represents the final diameter of the steel wire obtained in the final drawing process, D0 represents the diameter of the heat treated wire before the final drawing process and In represents natural logarithm) is 2.50 to 3.10.

IPC 8 full level

B21C 1/00 (2006.01); D07B 1/06 (2006.01)

CPC (source: EP US)

B21C 1/003 (2013.01 - EP US); D07B 1/066 (2013.01 - EP US); D07B 2205/3035 (2013.01 - EP US); D07B 2205/3057 (2013.01 - EP US); D07B 2501/2046 (2013.01 - EP US)

C-Set (source: EP US)

  1. D07B 2205/3035 + D07B 2801/10
  2. D07B 2205/3057 + D07B 2801/10

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DOCDB simple family (publication)

EP 2404681 A1 20120111; EP 2404681 A4 20151202; EP 2404681 B1 20181107; CN 102341194 A 20120201; JP 5701744 B2 20150415; JP WO2010101154 A1 20120910; US 2011314888 A1 20111229; WO 2010101154 A1 20100910

DOCDB simple family (application)

EP 10748749 A 20100302; CN 201080010487 A 20100302; JP 2010053352 W 20100302; JP 2011502765 A 20100302; US 201013254308 A 20100302