Increasing Wear resistance 2

[avrenim]

Hi

I am designing a linear hydraulic actuator and begining to think about the materials that I shall be using.

Does anyone know how the metal to metal wear 17-4 PH will have against itself, with 316 steel or chrome plated 17-4PH. Does anyone have any suggestions on the materials I should use if I need it to be corrosion, adhesive and abrasion resistant in that order.

I am using regular hydraulic oil as my fluid.

I would appreaciate and help that I can get

Thanks

 

[IceStationZebra]

I don't have any experience with those metals, but generally you don't want to use the same material on both surfaces. This generally leads to galling. You will be better off with dissimilar metals.

ISZ

 

[eromlignod]

440 Stainless?

Don
Kansas City

 

[TVP]

What is the source of corrosion? Are the actuator parts fully submerged in hydraulic oil, or are they also in contact with the surrounding environment? Stainless steel vs. stainless steel is not a good combination for reciprocating wear. Am we to assume that you are inquiring about materials for the tube and the piston in contact with the tube?

 

[unclesyd]

You might want to use Nitronic 60 for your MOC. It meets all of the posted criteria.

http://www.hpalloy.com/DataSheets/ni60.htm

 

[FACS]

We made stainless Steel pumps, and the gears were of different stainless.

The Nitronic 60 (mentioned by unclessyd) worked best with 316L.

17-4PH can be hardened to mitigate any galling against 316. We used it for locking pins in a sprin loaded chuck, and it worked well against 316, but the motion required was not too severe.

Chrome plating does not work all that well, especially if it is electroplate.

Try the Nitronic 60 to 316 first.


Charlie

http://www.facsco.com

 

[avrenim]

Hi
Thanks for all the responses so far.

Those materials are for the rod and the lid. There is some metal to metal contact there.

I do have to figure out the materials for the piston and tube. It will either be the same material combination I choose for the rod and the lid or something and black anodized aluminum(the tube).

The rod is fully submerged in the oil during alternating cylces but there shall be a part of it that will always be submerged and the rest in air.

 

[iainuts]

Hi avrenim,

the rod and the lid

the piston and tube

I'm no expert on hydraulic actuators, but I do design recip pumps. I'd never use metal to metal rubbing parts for the sliding surfaces of the rod, piston or 'lid' (end cap?). I'd suggest a DU bushing or make your own plastic wear sleeve.

Metal to metal sliding is never a good idea except perhaps when the amount of sliding is very minimal and well lubricated such as a gear pump or gear applications. Your application is well lubricated, but it sounds like there will be a lot of sliding where contact stresses might be significant.