During the process to find a suitable material to use in a submersed salt water environment, I ran across this alloy of stainless which promises extreme resistance to corrosion in a salt water environment and ultimate tensile strengths of 108,000 psi at 70 degrees F. Yields of 53,000 psi.
Attached a copied reference
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AL-6XN® (AL6XN / UNS N08367) Super-Austenitic Stainless Steel
Performance Profile
The levels of chromium, molybdenum and nitrogen in AL-6XN all serve to provide resistance to acidic oxidizing chloride solutions previously achieved only by the nickel base alloys. High nickel (24%) and molybdenum (6.3%) contents make AL-6XN a solution to chloride ion stress corrosion cracking. Because of its nitrogen content, AL-6XN has greater tensile strength than common austenitic stainlesses, while retaining high ductility and impact strength. The ASME allowable stresses for AL-6XN are up to 75% higher than for 316L stainless, and more than twice those for the copper-nickel alloys.
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As there are often threads on this forum that deals with corrosion of stainless and my absolute
inexperience with this alloy, ( I would have just bought 316 ss as a matter of course) I am wondering
if anyone has used the alloy and could give some comments on it. And a query as to
why, if it is as good as it is advertised to be, is it not the basis for most marine applications and hardware. Some information state that it is much cheaper than 316
Of a technical nature, they note that the alloy contains nitrogen, so how does this exist in a metal, suspended? Attached to
another element?
Attached a copied reference
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AL-6XN® (AL6XN / UNS N08367) Super-Austenitic Stainless Steel
- 6.3% molybdenum
- Over 25 years of proven seawater service
- Practical immunity to chloride stress cracking
- 50% stronger than stainless
- ASME coverage up to 800°F
- Easily welded
- Available in ALL product forms
Performance Profile
The levels of chromium, molybdenum and nitrogen in AL-6XN all serve to provide resistance to acidic oxidizing chloride solutions previously achieved only by the nickel base alloys. High nickel (24%) and molybdenum (6.3%) contents make AL-6XN a solution to chloride ion stress corrosion cracking. Because of its nitrogen content, AL-6XN has greater tensile strength than common austenitic stainlesses, while retaining high ductility and impact strength. The ASME allowable stresses for AL-6XN are up to 75% higher than for 316L stainless, and more than twice those for the copper-nickel alloys.
----------------------------------------------------------------------------------------------------------------
As there are often threads on this forum that deals with corrosion of stainless and my absolute
inexperience with this alloy, ( I would have just bought 316 ss as a matter of course) I am wondering
if anyone has used the alloy and could give some comments on it. And a query as to
why, if it is as good as it is advertised to be, is it not the basis for most marine applications and hardware. Some information state that it is much cheaper than 316
Of a technical nature, they note that the alloy contains nitrogen, so how does this exist in a metal, suspended? Attached to
another element?
