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Old 01-08-2015, 03:47 PM
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Default Aluminum is not Aluminum ...



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New blog post is now online. If you think aluminum is aluminum or think "aerospace aluminum" is a valid spec, you need to read and/or watch this.

http://www.ELZETTA.com/blog/AluminumAlloys

https://www.youtube.com/watch?v=yk4d...v_91HFkVfS7xRQ


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Old 01-08-2015, 04:28 PM
terrya terrya is offline
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Default Surgical stainless steel

That's another one. Surgical stainless steel. No such beast. Any stainless steel used in medical instruments becomes surgical stainless steel.
Just a catch phrase that sales people will "try" to use to sway people into buying their goods.
Terry
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Old 01-08-2015, 09:28 PM
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Originally Posted by Elzetta View Post
New blog post is now online. If you think aluminum is aluminum or think "aerospace aluminum" is a valid spec, you need to read and/or watch this.

http://www.ELZETTA.com/blog/AluminumAlloys

https://www.youtube.com/watch?v=yk4d...v_91HFkVfS7xRQ


Never heard the term "aerospace aluminum" used.
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Old 01-09-2015, 07:48 AM
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Never heard the term "aerospace aluminum" used.
Sadly, in the tactical flashlight industry, it is used a lot.
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Old 01-09-2015, 07:55 AM
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The only thing I know about aircraft aluminum is it has alclad coating on the shiny side and zinc chromate coating on the inner side.
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Old 01-09-2015, 11:47 AM
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I go by spec for traceability, if the print calls for 6061 i use that if it calls for 7075 i us that. list goes on.
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Old 01-09-2015, 12:09 PM
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Originally Posted by terrya View Post
That's another one. Surgical stainless steel. No such beast. Any stainless steel used in medical instruments becomes surgical stainless steel.
Just a catch phrase that sales people will "try" to use to sway people into buying their goods.
Terry
Yes, but it is an informal differentiator. There are many types of SS, just like any steel.
When someone refers to a 'surgical' stainless, they're usually referring to a grade which is more resistant to corrosion, as surgical instruments are sterilized using heat, pressure and chemicals. All of which accelerate corrosion. Even SS can rust/corrode. It's usually some variation of austenitic 316, compliant with ASTMF138.

Nickel content is also an issue, as nickel can cause autoimmune reactions in implants. Wear is also an issue. Some implants are under constant stress and wear (think hips and joints), so the ability to wear without shedding metal is also important.

Not a real thing, but it's a real thing. If that makes any sense...
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Old 01-09-2015, 09:19 PM
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Yes, but it is an informal differentiator. There are many types of SS, just like any steel.
When someone refers to a 'surgical' stainless, they're usually referring to a grade which is more resistant to corrosion, as surgical instruments are sterilized using heat, pressure and chemicals. All of which accelerate corrosion. Even SS can rust/corrode. It's usually some variation of austenitic 316, compliant with ASTMF138.

Nickel content is also an issue, as nickel can cause autoimmune reactions in implants. Wear is also an issue. Some implants are under constant stress and wear (think hips and joints), so the ability to wear without shedding metal is also important.

Not a real thing, but it's a real thing. If that makes any sense...
they just had a recall on one hip and knee implant company, guess they used a incorrect grade stainless (can you say cheaper) to up their profit margin, and fudged the MSDS paperwork. only problem was, 80% of their endusers are ending up with metal poisoning,due to wear on incorrect material. with most metals used in the aircraft/nasa/ marine/medical fields, has to have traceability , paperwork follows it all the way from the foundry. MSDS sheet.
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Old 01-09-2015, 09:39 PM
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Another one is Liberal Logic.

Truly meaningless.
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Old 01-09-2015, 09:40 PM
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they just had a recall on one hip and knee implant company, guess they used a incorrect grade stainless (can you say cheaper) to up their profit margin, and fudged the MSDS paperwork. only problem was, 80% of their endusers are ending up with metal poisoning,due to wear on incorrect material. with most metals used in the aircraft/nasa/ marine/medical fields, has to have traceability , paperwork follows it all the way from the foundry. MSDS sheet.

Who was this recall on? Stryker?
There's total traceability on implants.
I doubt anything was forged or fudged, more likely the manufacturer screwed up. Manufacturing processes are as important to durability and application as the chemical composition of the materials used. (Think Knife tempering - you can have two blades made of exactly the same stuff, but both are very different in use due to different tempers)

There's also no way to test every unit, and many defects don't become evident until time in use.
It happens though, that's why they track them...
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