3mm stainless steel - wow

[CyberGus]

At 2019 Nov Cybertruck on stage demo
2 tests by Franz with large hammer vs same door panel 3mm cold-rolled 30x stainless steel.
all tests passed with no dents in 3mm cold-rolled 30x stainless steel.

2 tests by Franz & team steel ball vs two different armor glass windows mounted in Cybertruck.
Both tests had extensive cracking of armor glass.

TESLA CYBERTRUCK LIVE Launch Event
** cued to 7:14 - hammer vs door


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** cued to 13:10 - steel ball vs door window


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Not just steel but for example 3mm cold-rolled 304L stainless steel?

The armor glass must not crack before 3mm cold-rolled 304L stainless steel shows significant dent.

What data shows 2 meter x 2 meter piece armor glass of similar weight and cost (adjust glass thickness as needed to get similar weight & cost) to 2 meter x 2 meter piece of 3mm cold-rolled 304L stainless steel, in several tests that when both are hit by a 10cm steel ball at same speed that the armor glass will not crack before the 3mm cold-rolled 304L stainless steel shows significant dent.

How often will the armor glass not crack until after the 3mm cold-rolled 304L stainless steel shows significant dent?

Materials are not measured solely as "hard". There's hardness, ductility, malleability, elasticity, etc.

Sure, glass will break and steel plate will not. But glass can better resist deformation, and more easily return to it's original shape (as long as it doesn't fail). For the weight, it provides more stiffness to a frame than a steel panel.

No one is suggesting that the doors should be made of glass lol

Although that would be pretty cool

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[SSonnentag]

Fair point on the hail, however, that applies to a very small percentage of the population

I've needed hail and careless parking lot user protection many more times than I've needed a spare tire, and yet so many people think a spare tire is essential.

 

[charliemagpie]

My prediction? 3mm thickness for doors, quarter panels and tailgate. Thinner gauge SS for frunk hood, fenders and front valance.

If you ever post that picture, you also need to hand out this :

 

[Dave Lyon]

Every once in a while I return to wondering just how strong 3 mm hardened stainless might be.

While 3mm is a substantial thickness of metal for the skin of an automobile, 300 series stainless is not "hardened steel". It's actually very soft.

 

[Jhodgesatmb]

The ramp is gone too. Bed is a composite material, not stainless steel anymore. There's more.

I too look forward to hearing about the others.

We do not know that the ramp is gone, only that you said it is, and having a liner doesn’t replace the underlying structural material so it adds weight. I am not doubting that there have been concerted efforts to reduce weight. My comment was about the unenumerated/unelaborated use of the term ‘many’. I suspect that the reduction in overall size will have the primary impact on weight.

 

[AeroTool]

3mm is .1181 inches, almost 1/8", which of course is .125". I find it incredible that Tesla would use material that thick. They may use that thickness in a limited number of areas.

 

[Jhodgesatmb]

While 3mm is a substantial thickness of metal for the skin of an automobile, 300 series stainless is not "hardened steel". It's actually very soft.

Even 304 is much harder to cut or bend than steel or most grades of aluminum (just from my limited experience), and seemingly less ductile. I suspect that cold rolling it just makes it that much harder. That said I am not an expert in metallurgy so I defer to others with more experience/expertise.

 

[Jhodgesatmb]

3mm is .1181 inches, almost 1/8", which of course is .125". I find it incredible that Tesla would use material that thick. They may use that thickness in a limited number of areas.

Yes, it was incredible when they announced it and remains incredible (and good). But they are the ones that said it, and contrary to several opinions (including yours) they never qualified it’s use; they just said that the Cybertruck exoskeleton would be 3 mm cold rolled stainless steel. I do not know more than you or anyone how much of the truck will be 3 mm but until Tesla says otherwise, or until someone cuts a CT up and measures it, I am going by what Tesla said.

 

[Jhodgesatmb]

The front corner of an out of control shopping trolley smashes into the side of the Cybertruck.

Will it leave a dent ?

No

 

[Mini2nut]

A recent Cybertruck display had zero reference to SS thickness. Mmmmmmm…

 

[firsttruck]

The front corner of an out of control shopping trolley smashes into the side of the Cybertruck.

Will it leave a dent ?

Sure, of course it will dent.

You were concerned about the shopping cart, right.

On the Cybertruck you might have to brush off some dust created by the impact of the chrome rust proof coating of the shopping cart's metal.

Hmmm, when Cybertrucks becomes #1 top selling truck, grocery stores might ban Cybertrucks from their parking lots because too many carts are running into Cybertrucks and getting damaged. Grocery store shopping cart replacement/repair budget is going to be busted.

 

[CT19TX]

SDI Sinton needs more time before they can start supplying automotive. Their Columbus, MS mill may be producing it though, cannot confirm nor deny.

 

[Dave Lyon]

Even 304 is much harder to cut or bend than steel or most grades of aluminum (just from my limited experience), and seemingly less ductile. I suspect that cold rolling it just makes it that much harder. That said I am not an expert in metallurgy so I defer to others with more experience/expertise.

You are correct. 300 series stainless sucks to cut, but it's soft. We use a 400 series of stainless to build injection molds. It gets MUCH harder, but is easier to machine in it's soft state than the 300 series.

 

[greggertruck]

It's door panels. Those the the 300 series stainless. The whole body is not. This has been said publicly already.

End of discussion?

 

[cvalue13]

It's door panels. Those the the 300 series stainless. The whole body is not. This has been said publicly already.

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