High-strength wire rod having high hydrogen embrittlement resistance for cold heading, and method for manufacturing the same

Abstract

Provided are a wire rod for high strength cold head quality steel with excellent resistance to hydrogen embrittlement, and a manufacturing method thereof. The wire rod for high strength cold head quality steel of the present invention, comprises, in percentage by weight: C: 0.3-0.5%; Si: 0.01-0.3%; Mn: 0.3-1.0%; Cr: 0.5-1.5%; Mo: 0.5-1.5%; V: 0.01-0.4%; and the balance consisting of Fe and other impurities, has a chemical composition that satisfies relational equation 1, has a microstructure including, in percentage by area: martensite: 1-15%; pearlite: 0.1-5% pearlite; and the balance consisting of bainite, wherein among the martensite, the proportion of martensite formed in grain boundaries of prior austenite is 60% or more.

Dependencies are inferred from the claim text.