6 ms·

Put a scratch in your sink. It'll rust.

KeplerBoy 3y ago
Proper stainless steal doesn't rust. It's not even coated. Source: Worked as a mechanical engineer designing industrial meat grinders and cutters. Folks throw in bones, meat, ice, salt and then heat it and grind it to a pulp but it never rusts.
- nullindividual 3y ago
  Thank you for bringing your experience to the thread! How many "improper" varieties of stainless steel are there? Are the fully stainless steels that will not rust under any circumstances exceptionally expensive compared to their less-than-ideal counterparts? I would assume given my experience with "stainless" steel sinks must mean they're less than ideal quality which is not a shocking surprise.
- elil17 3y ago
  Depends on the stainless alloy used. Meat grinders would be designed to stand up to salt - they use 304 or 316. Cybertruck's aren't, because they use a 301, which is less corrosion resistant. Meanwhile, 316 will gladly rust if put in a strong enough salt solution for long enough.
  - arcticbull 3y ago
    Why would a car body not be designed to stand up to salt? You know they put that stuff on roads right? Driving it in winter in much of these here United States (let alone Canada) is equivalent to bathing it in a saline solution and whipping salt nuggets at it. That would be quite the oversight.
    - kube-system 3y ago
      All cars are "designed to stand up to salt", including the cybertruck, just in different ways. Most auto manufacturers use mild steels which are highly susceptible to rust, but mitigate rust by using various types of coatings. This has significant drawbacks because coatings can be compromised by wear, causing the underlying steel to fail to corrosion. As my engineering professor always said, if you're willing to spend a few million dollars on a car, you can get one that will last a lifetime!
      - elil17 3y ago
        >including the cybertruck Apparently not, though - it's obviously rusting
        kube-system 3y ago
        Yes, including the cybertruck. Tesla chose 301 stainless to mitigate rust. It is not a perfect choice. Neither are coatings on mild steel. All cars are designed to resist corrosion but can and will under the right (wrong?) circumstances. There is no perfect material that does everything. All have pros-and-cons.
        elil17 3y ago
        I believe it's clearly unacceptable for a car to visibly rust within a year of production. That would never happen with a regular car.
        kube-system 3y ago
        It does happen with other cars. At my last job, the guy in the cubical next to me had a brand new car that had rust issues fixed under warranty. And traditional automakers don't warranty rust until the hole goes entirely through the body panel (i.e. rust perforation). Drive most steel bodied cars behind a salt truck in the rust belt and you'll often get small cosmetic rust spots: https://www.reddit.com/r/GrandCherokee/comments/vboker/should_i_claim_corrosionrust_warranty_on_this_spot/ https://www.reddit.com/r/GrandCherokee/comments/vboker/shoul... Remember, most traditional automakers are using steel with little to no corrosion resistance at all, and are relying on fragile coatings to do the work instead. This is not without its own drawbacks. You might not hear much about these types of issues, because cosmetic issues with traditional brands normally don't make the news, but recalls due to safety concerns do: https://www.fox9.com/news/driving-in-the-salt-belt-millions-of-cars-with-rust-recalls https://www.fox9.com/news/driving-in-the-salt-belt-millions-... TL;DR: steel cars corrode.
        3y ago
    - elil17 3y ago
      That's true, no other car company would build a car body that can't stand up to normal outdoor conditions. Perhaps there is a reason every other car in the world is painted...
    - nullindividual 3y ago
      Ever watched Fargo[0]? If not, don't forget your Truecoat. [0] https://www.youtube.com/watch?v=B2LLB9CGfLs https://www.youtube.com/watch?v=B2LLB9CGfLs
  - jtriangle 3y ago
    316L is better than all the above, and you can weld it. Also more expensive. I'd think for car body panels you'd want n50 or n60, but those are marine alloys, and they're spendy. It could also be that the material they're using isn't passivated well, in which case the fix is fairly simple (barkeepers friend and a buff wheel).
- turtlesdown11 3y ago
  > Proper stainless steal doesn't rust. It's not even coated. No. Stainless steel comes in many varieties and levels of corrosion resistance. In order to get increased corrosion resistance you trade other mechanical properties. Every choice of steel balances the level of corrosion resistance with the tradeoffs of loss of other properties. There is no truly corrosion proof steel, just various grades of resistance.
- deleted 3y ago
  [deleted]
ceejayoz 3y ago
My stainless steel sink is like all scratches. Still no rust.
deleted 3y ago
[deleted]

Proper stainless steal doesn't rust. It's not even coated. Source: Worked as a mechanical engineer designing industrial meat grinders and cutters. Folks throw in bones, meat, ice, salt and then heat it and grind it to a pulp but it never rusts.

nullindividual 3y ago
Thank you for bringing your experience to the thread! How many "improper" varieties of stainless steel are there? Are the fully stainless steels that will not rust under any circumstances exceptionally expensive compared to their less-than-ideal counterparts? I would assume given my experience with "stainless" steel sinks must mean they're less than ideal quality which is not a shocking surprise.
elil17 3y ago
Depends on the stainless alloy used. Meat grinders would be designed to stand up to salt - they use 304 or 316. Cybertruck's aren't, because they use a 301, which is less corrosion resistant. Meanwhile, 316 will gladly rust if put in a strong enough salt solution for long enough.
- arcticbull 3y ago
  Why would a car body not be designed to stand up to salt? You know they put that stuff on roads right? Driving it in winter in much of these here United States (let alone Canada) is equivalent to bathing it in a saline solution and whipping salt nuggets at it. That would be quite the oversight.
  - kube-system 3y ago
    All cars are "designed to stand up to salt", including the cybertruck, just in different ways. Most auto manufacturers use mild steels which are highly susceptible to rust, but mitigate rust by using various types of coatings. This has significant drawbacks because coatings can be compromised by wear, causing the underlying steel to fail to corrosion. As my engineering professor always said, if you're willing to spend a few million dollars on a car, you can get one that will last a lifetime!
    - elil17 3y ago
      >including the cybertruck Apparently not, though - it's obviously rusting
      - kube-system 3y ago
        Yes, including the cybertruck. Tesla chose 301 stainless to mitigate rust. It is not a perfect choice. Neither are coatings on mild steel. All cars are designed to resist corrosion but can and will under the right (wrong?) circumstances. There is no perfect material that does everything. All have pros-and-cons.
        elil17 3y ago
        I believe it's clearly unacceptable for a car to visibly rust within a year of production. That would never happen with a regular car.
        kube-system 3y ago
        It does happen with other cars. At my last job, the guy in the cubical next to me had a brand new car that had rust issues fixed under warranty. And traditional automakers don't warranty rust until the hole goes entirely through the body panel (i.e. rust perforation). Drive most steel bodied cars behind a salt truck in the rust belt and you'll often get small cosmetic rust spots: https://www.reddit.com/r/GrandCherokee/comments/vboker/should_i_claim_corrosionrust_warranty_on_this_spot/ https://www.reddit.com/r/GrandCherokee/comments/vboker/shoul... Remember, most traditional automakers are using steel with little to no corrosion resistance at all, and are relying on fragile coatings to do the work instead. This is not without its own drawbacks. You might not hear much about these types of issues, because cosmetic issues with traditional brands normally don't make the news, but recalls due to safety concerns do: https://www.fox9.com/news/driving-in-the-salt-belt-millions-of-cars-with-rust-recalls https://www.fox9.com/news/driving-in-the-salt-belt-millions-... TL;DR: steel cars corrode.
        3y ago
  - elil17 3y ago
    That's true, no other car company would build a car body that can't stand up to normal outdoor conditions. Perhaps there is a reason every other car in the world is painted...
  - nullindividual 3y ago
    Ever watched Fargo[0]? If not, don't forget your Truecoat. [0] https://www.youtube.com/watch?v=B2LLB9CGfLs https://www.youtube.com/watch?v=B2LLB9CGfLs
- jtriangle 3y ago
  316L is better than all the above, and you can weld it. Also more expensive. I'd think for car body panels you'd want n50 or n60, but those are marine alloys, and they're spendy. It could also be that the material they're using isn't passivated well, in which case the fix is fairly simple (barkeepers friend and a buff wheel).
turtlesdown11 3y ago
> Proper stainless steal doesn't rust. It's not even coated. No. Stainless steel comes in many varieties and levels of corrosion resistance. In order to get increased corrosion resistance you trade other mechanical properties. Every choice of steel balances the level of corrosion resistance with the tradeoffs of loss of other properties. There is no truly corrosion proof steel, just various grades of resistance.
deleted 3y ago
[deleted]

ceejayoz 3y ago

My stainless steel sink is like all scratches. Still no rust.

deleted 3y ago

[deleted]