US 11,738,600 B2
Steel cord for rubber enhancement and manufacturing method therefor
Pyeong Yeol Park, Pohang-si (KR); Hong Ki Kim, Pohang-si (KR); Dong Kil Lee, Pohang-si (KR); and Sang Ho Kim, Pohang-si (KR)
Assigned to Trefil Arbed Korea Co. LTD, Yangsan-Si (KR)
Appl. No. 16/966,685
Filed by TREFIL ARBED KOREA CO., LTD, Yangsan-si (KR)
PCT Filed Apr. 25, 2019, PCT No. PCT/KR2019/004986
§ 371(c)(1), (2) Date Jul. 31, 2020,
PCT Pub. No. WO2020/218640, PCT Pub. Date Oct. 29, 2020.
Prior Publication US 2021/0237513 A1, Aug. 5, 2021
Int. Cl. B60C 9/00 (2006.01); C25D 5/50 (2006.01); B32B 15/01 (2006.01); C25D 5/10 (2006.01); D07B 1/06 (2006.01)
CPC B60C 9/0007 (2013.01) [B32B 15/015 (2013.01); C25D 5/10 (2013.01); C25D 5/50 (2013.01); D07B 1/066 (2013.01); D07B 1/0646 (2013.01); B60C 2009/0014 (2013.01); D07B 2501/2046 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A steel cord for rubber reinforcement, comprising at least one strand of a plated steel wire, wherein the plated steel wire comprises a plating layer of Cu—Co—Zn and has a concentration gradient in which the Co content ratio (Co/(Cu+Zn+Co)) in a region from an outside surface of the plating to ¼ of the plating layer is 40% or more and up to ½ of the plating layer 20% or more compared with the Co content ratio in the entire region of the plating layer, wherein the plating layer of Cu—Co—Zn is a ternary alloy sequentially plated on a surface of a steel wire in the order of Cu→Co→Zn followed by thermal diffusion.