Non-quenched and tempered steel for crankshaft and crankshaft using same

• Main Authors: OHASHI RYOSUKE, HAMADA TAKAHIRO, YASUDA SHINJI, MASUO HIDEKI, ASAOKA SHOHEI, KOBAYASHI DAISUKE, YAMADA YUICHI, KATO, MAKIO, GOLOBORODEK ANATOLY
• Format: Patent
• Language: Chinese; English
• Published: 24.11.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

This non-quenched and tempered steel for crankshafts contains iron (Fe) as the main component, and contains 0.37-0.43 mass% of carbon (C), 0.15-0.35 mass% of silicon (Si), 0.90-1.30 mass% of manganese (Mn), 0.08-0.15 mass% of vanadium (V), the content of phosphorus (P) being 0.030 mass% or less, the content of copper (Cu) being 0.300 mass% or less, the content of nickel (Ni) being 0.30 mass% or less, and the content of chromium (Cr) being 0.35 mass% or less. Furthermore, as elements for improving machinability, 0.010-0.035% by mass of sulfur (S) and 0.02-0.05% by mass of bismuth (Bi) are contained, thereby having high fatigue strength and yield strength and excellent machinability. 本发明的曲轴用非调质钢将铁(Fe)设为主成分，含有0.37～0.43质量％的碳(C)、0.15～0.35质量％的硅(Si)、0.90～1.30质量％的锰(Mn)、0.08～0.15质量％的钒(V)，磷(P)的含量为0.030质量％以下，铜(Cu)的含量为0.300质量％以下，镍(Ni)的含量为0.30质量％以下，铬(Cr)的含量为0.35质量％以下。而且，含有0.010～0.035质量％的硫(S)、0.02～0.05质量％的铋(Bi)作为提高切削加工性的元素，因此，疲劳强度及屈服强度高，切削加工性也优异。