The industries that commonly use 36CrNiMo4 steel include:

1. Automotive industry: This steel is often used in the production of engine components, such as crankshafts, connecting rods, and gears. Its high strength and durability make it suitable for withstanding the loads and stresses experienced in engines.

2. Aerospace industry: 36CrNiMo4 steel is used in the manufacturing of various aerospace components, such as landing gear parts, rotor shafts, and turbine blades. Its high strength and resistance to fatigue make it ideal for aerospace applications.

3. Oil and gas industry: This steel is utilized in equipment and components for oil extraction, drilling, and refining. Its superior strength and corrosion resistance enable it to withstand harsh operating conditions in the oil and gas sector.

4. Heavy machinery industry: 36CrNiMo4 steel is commonly used in the production of heavy machinery components, including gears, shafts, and axles. Its exceptional strength and toughness make it suitable for heavy-duty applications.

5. Power generation industry: This steel finds applications in the manufacturing of turbine components, such as blades, shafts, and fasteners. Its high temperature resistance and durability are critical for reliable power generation.

6. Construction industry: 36CrNiMo4 steel is employed in the construction of high-load bearing structures, such as bridges and buildings. Its exceptional strength and toughness ensure durability and safety in demanding construction projects.

These are just some of the industries that widely use 36CrNiMo4 steel due to its unmatched strength, durability, and mechanical properties.