Lifespan of 304 and 316 stainless steel plate
Lifespan of 304 and 316 stainless steel plate
(OP)
I've recently been asked to estimate the lifespan of a proposed stainless steel plate structure. Our firm does mine reclamation work in northern Saskatchewan, Canada, and we've done a number of mine hole covers in the past with 316L stainless steel based on the client's recommendation. Following field fitting and assembly, the older mine covers were pickled and passivated to maximum longevity.
We're now in the proposal stage for a number of new covers. The new client has asked that we define which steel to use (we've narrowed it down to 304 or 316 stainless steel), and that we estimate the lifespan of the plate structures. For the most part, the structures will be subject to ground snow load (in the 60psf range) yearly and otherwise be untouched and unloaded as the covers are extremely remote. In lieu of sabotage, does anyone care to venture an educated guess at lifespan for a 304 stainless steel product that has been properly pickled and passivated in the field? And for a 316 product?
Any opinion I bring to the client's attention will likely need to be backed up either by calculation or literature in the area.
Thank you in advance.
pbc825
We're now in the proposal stage for a number of new covers. The new client has asked that we define which steel to use (we've narrowed it down to 304 or 316 stainless steel), and that we estimate the lifespan of the plate structures. For the most part, the structures will be subject to ground snow load (in the 60psf range) yearly and otherwise be untouched and unloaded as the covers are extremely remote. In lieu of sabotage, does anyone care to venture an educated guess at lifespan for a 304 stainless steel product that has been properly pickled and passivated in the field? And for a 316 product?
Any opinion I bring to the client's attention will likely need to be backed up either by calculation or literature in the area.
Thank you in advance.
pbc825






RE: Lifespan of 304 and 316 stainless steel plate
As for the lifetime, I've got absolutely no idea what could be a representative annual weight loss...
RE: Lifespan of 304 and 316 stainless steel plate
The more germane question would be what the life requirement is? Is it 20, 50, 100, or 500 yrs. What does the cover need to do over that time?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Lifespan of 304 and 316 stainless steel plate
The cover needs to simply exist over the lifespan. The client is responsible for estimated future replacement cost; therefore, if I say it's good for 1000 years then the capital required at turn over is much less than if I say it's good for 100 years given the time-value of money.
RE: Lifespan of 304 and 316 stainless steel plate
But, what is the required lifespan? If the required lifespan is 20 years, it'll be irrelevant. If the required lifespan is 5000 yrs, then neither is adequate. And that doesn't necessarily account for the basic cost of the cover with different lifespans, since the lower lifespan cover might be substantially cheaper to make, and might even cover the cost of the replacement, as an example.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Lifespan of 304 and 316 stainless steel plate
RE: Lifespan of 304 and 316 stainless steel plate
RE: Lifespan of 304 and 316 stainless steel plate
RE: Lifespan of 304 and 316 stainless steel plate
This reference suggests corrosion rates of less than 0.1 mm/year are typical.
RE: Lifespan of 304 and 316 stainless steel plate
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx