Some industries that use 34CrNiMo6 Steel in high-stress applications include:

1. Automotive: 34CrNiMo6 Steel is commonly used in the manufacturing of gears, crankshafts, and axle shafts in automobiles and other vehicles.
2. Aerospace: This steel grade is used in the aerospace industry for components such as landing gear, turbine parts, and transmission shafts.
3. Oil and Gas: 34CrNiMo6 Steel is used for components in drilling equipment, such as drill collars and drill pipes, that require high strength and resistance to fatigue.
4. Power Generation: The steel is used in power plants for the manufacturing of turbine components, such as turbine shafts and rotor disks.
5. Heavy Equipment: Industries involved in the manufacturing of heavy machinery, such as construction equipment and mining machinery, use 34CrNiMo6 Steel for high-stress components.

These industries require materials with high strength, toughness, and durability to withstand the extreme conditions and loads they operate under. 34CrNiMo6 Steel is favored due to its excellent mechanical properties and high resistance to wear and fatigue, making it the ultimate choice for such applications.