shaft material choice: stainless
shaft material choice: stainless
(OP)
I need to specify a shaft material for the following application:
* submerged in freshwater
* Max torque 320 N-m(~3000 in-lbf)
* Continuous duty
* Will have plain bearings mounted on it (probably the bearings will actually reference against special shaft sleeves, not on the shaft itself)
* Will have roller-chain sprockets with keys mounted on it
I'm thinking a 416 Stainless Steel, Condition T (ASTM A582), hardened to ~30 Rockwell C; Tensile Strength: 758 MPa; Yield Strength 586 MPa. Material data can be found here:
http://www.azom.com/details.asp?ArticleID=971
Is there a better choice, that would supply similar properties at a better price, and be easy to machine?
Thanks...
* submerged in freshwater
* Max torque 320 N-m(~3000 in-lbf)
* Continuous duty
* Will have plain bearings mounted on it (probably the bearings will actually reference against special shaft sleeves, not on the shaft itself)
* Will have roller-chain sprockets with keys mounted on it
I'm thinking a 416 Stainless Steel, Condition T (ASTM A582), hardened to ~30 Rockwell C; Tensile Strength: 758 MPa; Yield Strength 586 MPa. Material data can be found here:
http://www.azom.com/details.asp?ArticleID=971
Is there a better choice, that would supply similar properties at a better price, and be easy to machine?
Thanks...





RE: shaft material choice: stainless
400 series is rust resistant, meaning it will corrode under conditions.
Charlie
www.facsco.com
RE: shaft material choice: stainless
416 will harden up to 43 Rc. It's not a corrosion resistant as 300 series or Nitronic 60, but it's probably OK for a fresh water application. Another possiblity is 410, which is a little cheaper, but it's not as machinable.
Don
Kansas City
RE: shaft material choice: stainless
Helpful SW websites FAQ559-520
How to get answers to your SW questions FAQ559-1091
RE: shaft material choice: stainless
I think I'd like to go with a 400-series for the hardenability; is the difference in machineability really large between 410 and 416? What about price?
17-4PH would be a nice choice but isn't it comparatively more expensive?
RE: shaft material choice: stainless
"Corrosion Resistance
Excellent resistance to a wide variety of corrosive media. Reasonable resistance to salt water in cold southern waters but less resistant than Grade 316 in tropical waters. Overall the corrosion resistance of 431 is approximately the same as or slightly below that of grade 304.
Performance is best with a smooth surface finish, in the hardened and tempered condition."
Question is: how available is 431, and at what cost?
RE: shaft material choice: stainless
RE: shaft material choice: stainless
If you don't mind, a couple questions:
What level hardness do you specify? Do you source the metal in condition "P"? And what surface finish do you specify?
Thanks.
RE: shaft material choice: stainless
Someone mentioned 431, which I believe is supposed to have better corrosion resistance, but I think it's pretty exotic. My suppliers don't even carry it. I think it's also difficult to machine and particularly to grind, which you'll probably want to do. I think if you're not in salt water, you should be all right with the 416.
Don
Kansas City
RE: shaft material choice: stainless
RE: shaft material choice: stainless
And what does "Shaft Quality" mean?
Sorry for the dumb questions; thanks for your insights.
RE: shaft material choice: stainless
RE: shaft material choice: stainless
RE: shaft material choice: stainless
RE: shaft material choice: stainless
www.grizzlysprockets.com
RE: shaft material choice: stainless
It's a wonderful resource to be able to learn from all of your collective experience. Thanks.
RE: shaft material choice: stainless
RE: shaft material choice: stainless
These people have all the better wet shaft materials available.
http://www.gpcprop.com/inboard_shaft_machining.htm
http://www.wbmetals.com/shafting.asp#top
Here is a another representative for Aquamnt by Crucible.
http://www.aquamet.com/sizesdiameters/
RE: shaft material choice: stainless
I would consider using Stainless Steel 316L for your shafting.
regards
desertfox
RE: shaft material choice: stainless
The 400 series work well in fresh or salt water. We come across them in lost of boats and yachts. No general corrosion but be very careful in regions where oxygen starvation can occur, since crevice corrosion may pose a very serious problem (same for 316 series for that matter). We have seen serious pitting and fatigue induced fracture from this pitting in bearings (especially rubber bearings), seals, or, in the case of idle installations, under deposits. In some cases forced water refreshing had to be applied in order to solve such problems.
RE: shaft material choice: stainless
RE: shaft material choice: stainless
RE: shaft material choice: stainless