EP 2832878 B1 20190814 - WIRE ROD AND STEEL WIRE USING SAME
Title (en)
WIRE ROD AND STEEL WIRE USING SAME
Title (de)
WALZDRAHT UND STAHLDRAHT DAMIT
Title (fr)
TIGE DE FIL MÉTALLIQUE ET FIL D'ACIER L'UTILISANT
Publication
Application
Priority
- JP 2012077003 A 20120329
- JP 2013058566 W 20130325
Abstract (en)
[origin: EP2832878A1] A wire rod contains C, Si, Mn, N, Al, P, and S in predetermined contents with the remainder being iron and inevitable impurities. The Al and N contents meet a condition specified by Expression (1) as follows: [Al]‰¤-2.1×10×[N]+0.255 (1), where [Al] and [N] are contents (in mass percent) of Al and N, respectively. The wire rod has a microstructure including 95 percent by area or more of a pearlite. The wire rod has an AlN content of 0.005% or more and a percentage of AlN particles having a diameter d GM of 10 to 20 µm of 50% or more (in number percent) in an extreme value distribution of maximum values of the diameters d GM of AlN particles, where the d GM refers to a geometrical mean (ab) 1/2 of a length "a" and a thickness "b" of an AlN particle. The wire rod is usable typically for a high-strength prestressing steel wire and wire rope that less suffer from reduction in delayed fracture resistance with an increasing strength and have delayed fracture resistance conforming building standards.
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/06 (2006.01); C21D 8/08 (2006.01); C21D 9/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP)
C21D 8/06 (2013.01); C21D 8/065 (2013.01); C21D 8/08 (2013.01); C21D 9/02 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C21D 9/52 (2013.01); C21D 2211/004 (2013.01); C21D 2211/009 (2013.01)
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2832878 A1 20150204; EP 2832878 A4 20160427; EP 2832878 B1 20190814; CN 104204255 A 20141210; CN 104204255 B 20160824; ES 2743735 T3 20200220; JP 2013204133 A 20131007; JP 5802162 B2 20151028; KR 101624447 B1 20160525; KR 20140129239 A 20141106; MX 2014011471 A 20141208; WO 2013146676 A1 20131003; ZA 201406891 B 20160127
DOCDB simple family (application)
EP 13767810 A 20130325; CN 201380016256 A 20130325; ES 13767810 T 20130325; JP 2012077003 A 20120329; JP 2013058566 W 20130325; KR 20147026390 A 20130325; MX 2014011471 A 20130325; ZA 201406891 A 20140919