| 摘要 |
<p>In accordance with an aspect of the present invention, provided are a wire rod and a steel wire, which do not cause contamination by omitting lead patent (LP) heat treatment and obtain sufficient strength by heat-treating a low carbon steel wire rod, and a manufacturing method thereof. The wire rod for a spring contains 0.05-0.15 wt% of C, 1.7-2.2 wt% of Si, 1.0-2.0 wt% of Mn, at most 0.025 wt% of P, at most 0.015 wt% of S, residual Fe, and unavoidable impurities. minute tissues include ferrite, bainite, and residual austenite. [Reference numerals] (AA) Temperature (°C); (BB) Time (sec)</p> |
