Used as important tempering parts requiring good toughness, high strength, and large size, such as heavy machinery high-load shafts, turbine shafts larger than 250mm, helicopter rotor shafts, turbojet turbine shafts, blades, high Load transmission parts, crankshaft fasteners. Gears, etc.; can also be used to operate rotor shafts and blades with temperatures exceeding 400 °C; it can also be used to make important parts of special performance requirements after nitriding treatment. It can be used after low temperature tempering or after isothermal quenching. Use for strength steel.
