| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbon steel composition for a reduced thermal strain steering rack bar, which reduces a production process by increasing strength of the carbon steel composition and reducing a thermal strain through nitriding heat-treatment change, and a method for manufacturing the same.SOLUTION: The carbon steel composition for a steering rack bar contains iron (Fe) as a main component, 0.39 to 0.43 wt.% of carbon (C), 0.15 to 0.35 wt.% of silicon (S), 0.90 to 1.10 wt.% of manganese (Mn), 0.02 to 0.04 wt.% of niobium (Nb), and 0.10 to 0.15 wt.% of vanadium (V). The method for manufacturing a carbon steel composition for a steering rack bar includes: a step of filling and drawing the carbon steel composition; a step of broaching the filled and drawn carbon steel composition; a step of performing nitriding heat-treatment on a surface of the broached carbon steel composition; and a step of inspecting the nitriding heat-treated carbon steel composition.SELECTED DRAWING: Figure 6 |
