The industries that may use 35S20 steel grade include:

1. Automotive industry: 35S20 steel is commonly used in the production of various automotive parts, such as gears, sprockets, shafts, and axles.

2. Construction industry: This steel grade may be used in the construction of buildings, bridges, and other infrastructure projects, where high strength and durability are required.

3. Machinery industry: 35S20 steel can be used in the manufacturing of machinery components, such as gears, pins, and shafts, where its strength and wear resistance properties are beneficial.

4. Manufacturing industry: Various manufacturing processes may require the use of 35S20 steel grade, such as in the production of tools, dies, and molds.

5. Oil and gas industry: 35S20 steel may find applications in the oil and gas sector, including the production of drilling equipment and parts for pipelines.

It is important to note that the specific use of 35S20 steel grade may vary depending on the requirements of each industry and the specific application within that industry.