Patent ID: 11905571
Assignee: POSCO CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A CHQ wire rod comprising, in percent (%) by weight of the entire composition, C: 0.3 to 0.5%, Si: 0.1 to 0.3%, Mn: 0.5 to 1.0%, Cr: 0.5 to 1.5%, Mo: 0.5 to 1.5%, V: 0.01 to 0.2%, the remainder of iron (Fc) and other inevitable impurities, and the value of the following formula (1) is 3.56 or more;

[Cr]+2.7*[Mo]+6*[V]  (1), (Here, [Cr], [Mo], and [V] mean the weight % of Cr, Mo, and V, respectively)
wherein the wire rod comprises a bainite, a martensite, and a pearlite as a microstructure, and in area fraction, the bainite is 85% or more, the martensite is 2 to 10%, and the pearlite is 1 to 5%.