| 摘要 |
Provided is a production method of a carburized steel component, which can improve a gas carburizing property of a steel component having a high Si content, and suppress deterioration of productivity. The present production method includes a preliminary gas carburizing process, and a main gas carburizing process. In the preliminary gas carburizing process, a steel component having a chemical composition that contains C, Si, Mn, and Cr and, in mass%, satisfies Formula (1) is subjected to a gas carburizing treatment at a carburizing temperature T p that satisfies Formula (A) for 10 to less than 20 hours. In the main gas carburizing process, a gas carburizing treatment is performed at a carburizing temperature T r (°C) that satisfies Formula (B) for a carburizing time t r (minutes). 6.5 < 3.5 Si % + Mn % + 3 Cr % ‰¤ 18 800 ‰¤ T p < 163 × ln CP + 0.6 ˆ’ 41 × ln 3.5 × Si % + Mn % + 3 × Cr % + 950 4 < 13340 / T r + 273.15 ˆ’ ln t r < 7 Where, CP in the formula is substituted by a carbon potential during carburization in the preliminary carburizing process. |
