Maxtop super-speed quenching oil is developed from deeply refined low-viscosity, high-flash-point distillate oil, adding various additives such as refrigerants, antioxidants, carbon deposition inhibitors, and preservatives. It has a very high cooling rate and is especially suitable for bright quenching of large-module gears, large-section bearing rolling elements, sewing machine workpieces, textile workpieces, hardware tools and other workpieces under protective atmosphere or controlled atmosphere conditions.