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17-10-2016, 12:05
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#1
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Stainless or Titanium?
I have a sheet of .050 301 half hard stainless or a sheet or 6/4 Titanium that I can use to make a wear plate I guess I'll call it for the anchor chain to slide over on my bowsprit.
Which would be a better material, I'm not sure how rust proof 301 SS is.
Can you polish Ti very easily? Sheet I have is a sort of dull grey in appearance not shiny.
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17-10-2016, 12:11
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#2
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Registered User
Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
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Re: Stainless or Titanium?
I'd use the Ti just on principle if you can machine it easily (at low cost). More for corrosion resistance than anything. And if it helps, brushed stainless looks a lot like Ti, I've mistaken one for the other at a distance of 2m. Such as on Bob Perry's "Icon". She was the first boat that I saw stainless with that finish on it.
I'd reckon that you can find the answers to both of your questions somewhere online, even if someone pipes up. Just for your own peace of mind.
__________________
The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
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17-10-2016, 12:16
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#3
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Registered User
Join Date: Oct 2008
Boat: Custom cutter, 42'
Posts: 701
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Re: Stainless or Titanium?
301 has a bit less corrosion resistance than 304, and 304 isn't good around salt water, so I'd call 301 unacceptable. Titanium corrosion resistance is excellent.
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17-10-2016, 12:22
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#4
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Registered User
Join Date: Jun 2010
Location: Easton, MD
Boat: 15' Catboat, Bristol 35.5
Posts: 3,510
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Re: Stainless or Titanium?
What about "hardness"?
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17-10-2016, 12:30
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#5
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Stainless or Titanium?
Quote:
Originally Posted by kmacdonald
What about "hardness"?
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The Ti? I feel sure I can drill through it, I'll just shear the sheet about 6" wide, I won't be doing any working on it, no machining or anything. I had thought to break a 90 in each side to make a trough that the chain would slide in, then thought it would be a bear to stand on, that just make it wider and flat would be better.
The Ti is matte finish although it's dirty too so hard to tell exactly, it's definitely not brushed. It's not polished though either.
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17-10-2016, 12:41
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#6
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,135
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Re: Stainless or Titanium?
A non-polished finish will retain mud more, perhaps, and I'm not sure about the abrasion resistance of Ti. Likely depends on the specific alloy.
My 304 s/s wear plate has taken a beating from the chain over the years and looks a bit agricultural, even a bit "tarnished', but it has sure saved the deck.
Jim
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Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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17-10-2016, 12:45
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#7
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Stainless or Titanium?
301 and 304 are nearly identical at normal temperatures I think. Stronger that 316, but not as corrosion resistant.
The Ti is smooth, won't hold mud, but isn't polished. Ti I don't think is as wear resistant as SS, Ti isn't good to make crankshafts out of for example, where you would think it would be ideal, strong and light, but doesn't work well as a bearing surface I guess.
I do need something or the teak will pay the price.
I may go with the Ti if I can get it without paying the Aviation price that it was bought at back when Ti was crazy high. The SS is free.
On edit the Ti is 6/4 grade 5, I believe majority of Ti is this 6% vanadium, 4 % aluminum I think
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17-10-2016, 13:52
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#8
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Registered User
Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
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Re: Stainless or Titanium?
Stumble knows more than a little about Ti, at least compared to the rest of us
Edit: Titanium achieves some gorgeous straw colors when heated, if memory serves. As I think I recall some earrings of Isabelle Autisse's that were truly amazing. And so what I'm wondering is, can you surface harden Ti via such a backyard heat treat? Enough to improve it's wear resistance perhaps? Can't hurt to check. And if it does, might you tune the Titaniums color to a pleasing hue?
__________________
The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
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17-10-2016, 14:10
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#9
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Registered User
Join Date: May 2014
Location: USA
Boat: 41' yawl
Posts: 1,187
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Re: Stainless or Titanium?
Quote:
Originally Posted by a64pilot
301 and 304 are nearly identical at normal temperatures I think. Stronger that 316, but not as corrosion resistant.
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I've always heard that 316 is weaker than 304 but the Goog tells me they are both 90kpsi tensile, 40kpsi yield...
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17-10-2016, 14:15
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#10
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
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Re: Stainless or Titanium?
Ti would be great, but 6al-4v will be hard to bend if you need to bend it. Forget polishing it, although I guess it can be polished to some extent.
The stainless is fine also for that purpose.
For all intents and purposes 300 series stainless is the same strength... the allowable variation in each grade overlaps... so unless you have certificates, you don't know if what you have in 304 is stronger than what you have in 316 anyway.... and it's all minimal.
Some great colors in Ti after heating from gold to purple to dark blue. Any color especially in the purple or blue may mean it's been exposed to air hot and is degraded.
Lower grades of commercially pure Ti are fairly bendable, Ti70 or alloys like 6Al4V are not very bendable, except with a big radius bend.
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"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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17-10-2016, 14:34
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#11
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Registered User
Join Date: Jun 2016
Location: Brisbane Australia
Boat: Schionning Waterline 1480
Posts: 1,987
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Re: Stainless or Titanium?
Quote:
Originally Posted by a64pilot
I have a sheet of .050 301 half hard stainless or a sheet or 6/4 Titanium that I can use to make a wear plate I guess I'll call it for the anchor chain to slide over on my bowsprit.
Which would be a better material, I'm not sure how rust proof 301 SS is.
Can you polish Ti very easily? Sheet I have is a sort of dull grey in appearance not shiny.
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Will the chain slide along the material or will it have the full load on it? 0.5mm? Won't last under heavy load and will deform but will last ok if it just slides along. The particles of metal from the chain that might be left on the stainless will rust regardless of the material used.
Most stainless has chinnesium (pun) and doesn't have the resistance it used to. Don't know much about Ti, we have used it and it tends to pick up on the tooling so gut feel is it would wear more as the 304 and 316 work harden.
304 will tea stain in salty environment.
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Regards
Dave
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17-10-2016, 15:28
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#12
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Registered User
Join Date: Jun 2016
Location: Brisbane Australia
Boat: Schionning Waterline 1480
Posts: 1,987
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Re: Stainless or Titanium?
This thread showed up at the bottom of the page as a suggested thread. I haven't read it and I have no idea if it is of value or if it is correct.
http://www.cruisersforum.com/forums/...tes-85335.html
__________________
Regards
Dave
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17-10-2016, 15:37
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#13
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Registered User
Join Date: Aug 2011
Location: St. Petersburg, FL
Boat: Morgan Moorings 50
Posts: 1,895
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Re: Stainless or Titanium?
Go for burnt titanium
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17-10-2016, 15:43
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#14
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Registered User
Join Date: Apr 2007
Location: Marina del Rey, California
Boat: President 43 Sportfish
Posts: 4,105
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Re: Stainless or Titanium?
Stainless is superior for this application.
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1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
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18-10-2016, 03:41
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#15
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,085
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Re: Stainless or Titanium?
“The surfaces of titanium and of all commercially produced alloys of titanium have relatively poor wear resistance. In particular, titanium surfaces in contact with each other or with other metals readily gall under conditions of sliding contact or fretting. Even with light loading and little relative movement, complete seizure of surfaces can occur...”
➥ Titanium Alloys - Wear Resistance
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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