US 11,952,650 B2
Steel wire
Shinya Teramoto, Tokyo (JP); Yutaka Neishi, Tokyo (JP); Michimasa Aono, Tokyo (JP); Shuji Kozawa, Tokyo (JP); Satoru Mineta, Tokyo (JP); Tatsuro Ochi, Tokyo (JP); and Shoichi Suzuki, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP); and NIPPON STEEL SG WIRE CO., LTD., Tokyo (JP)
Appl. No. 17/754,748
Filed by NIPPON STEEL CORPORATION, Tokyo (JP); and NIPPON STEEL SG WIRE CO., LTD., Tokyo (JP)
PCT Filed Oct. 15, 2020, PCT No. PCT/JP2020/038954
§ 371(c)(1), (2) Date Apr. 11, 2022,
PCT Pub. No. WO2021/075509, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 2019-189270 (JP), filed on Oct. 16, 2019.
Prior Publication US 2023/0392244 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/54 (2006.01); B21C 1/00 (2006.01); B21C 37/04 (2006.01); C21D 1/18 (2006.01); C21D 1/30 (2006.01); C21D 1/74 (2006.01); C21D 6/00 (2006.01); C21D 8/06 (2006.01); C21D 9/02 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); F16F 1/02 (2006.01)
CPC C22C 38/54 (2013.01) [B21C 1/003 (2013.01); B21C 37/045 (2013.01); C21D 1/18 (2013.01); C21D 1/30 (2013.01); C21D 1/74 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/065 (2013.01); C21D 9/02 (2013.01); C21D 9/525 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C21D 2211/008 (2013.01); C22C 2202/02 (2013.01); F16F 1/021 (2013.01); F16F 2224/0208 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A steel wire having a chemical composition consisting of, in mass %,
C: 0.53 to 0.59%,
Si: 2.51 to 2.90%,
Mn: 0.70 to 0.85%,
P: 0.020% or less,
S: 0.020% or less,
Cr: 1.40 to 1.70%,
Mo: 0.17 to 0.53%,
V: 0.23 to 0.33%,
Cu: 0.050% or less,
Ni: 0.050% or less,
Al: 0.0050% or less,
Ti: 0.050% or less,
N: 0.0070% or less,
Ca: 0 to 0.0050%, and
Nb: 0 to 0.020%,
with the balance being Fe and impurities,
wherein a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 per μm2.