Gear material for deminarlized water

[moiz19670309]

I want to use a simple gear mechanism under water. It is an open type gear train and i want to use water as lubricant. Hence my open gear box would remain submerged in water. The water is deminaralized. I want to use some grade of steel. Can anybody help me finding a material that can work in submerged water environment but strong enough to act as a gear. Further , i want to use bush on gear shaft under water . What should be the material of this bush . The shaft is SS 316L over which i want to use bush.

 

[TVP]

You haven't provided very much information on the environment, stresses, etc. For gear steel, one option is the carburizing stainless steel from Cartech/Latrobe known as CSS-42L:

http://customer.cartech.com/assets/documents/datasheets/CSS-42L_extended.pdf

This steel is case carburized just like conventional gear steels, but it has sufficient Cr to make it corrosion resistant in mild environments.
For the bushing, there are too many unknowns. Perhaps a bearing-grade of plastic (nylon filled with glass fiber & PTFE) would be ok, but this will depend on temperature, load, etc.

 

[ornerynorsk]

"I want to use some grade of steel."

What are your mechanical requirements? Delrin (acetal) can work well in wet service.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[EdStainless]

I would use non-metallics. DI water has about the same lubricity as dry air, and is much more corrosive. Plastics and ceramics will work in this environment, steels will not.

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P.E. Metallurgy, Plymouth Tube