Can you tell me what this hub is made of??

Check if the hub is magnetic, if it is weak in magnetism, chances are it is a stainless alloy. I would assume that it is so, because that surface must be corrosion free. If it is not magnetic at all, then it could be aluminum, although, I doubt it would be aluminum, because it would be too soft and weak for that part.

Contact a metal treatment shop, ie heat treater, chrome or welding shop, they may have a spectrometer you can use to analyze the metal.

 

The braking system on the Challenge Stradale comprises carbon-ceramic (CCM, Carbon Composite Material) discs: the result of highly advanced studies conducted by Ferrari in conjunction with Brembo, the supplier of this system.

Dimensions of the brake discs are as follows: front: 380 mm diameter x 34 mm thickness, and a differentiated-diameter, 6-piston calliper; rear: 350 mm diameter x 34 m thickness; and a differentiated-diameter, 4-piston calliper The carbon-ceramic system installed on the Challenge Stradale, together with the aluminium brake carriers, makes for astounding performance and braking distance. In terms of weight, the reduction achieved for the Challenge Stradale is 16% when compared with conventional brake discs. Overall deceleration rates for the Challenge Stradale are 15% better than for the 360 Modena.

 

The "hub" or what the CCM rotor bolts to and what fits over the actual hub (part of the stub axle assembly) is likely made from aluminum. Perhaps carved from a billet of 6061-T6? Better known as a "brake hat" or "rotor hat."

-Peter

 

We sell and support mobile SEM/EDX machines to aviation market so if your really determined you could send me a tiny particle/shaving of it (not on sellotape!) and I'll get you the exact elemental composition of the alloy, but you'd have to be careful to not contaminate in the process of liberating the particle/shaving.

I'm in Bristol, UK, by all means PM me if you wish to follow up and I'll provide address.

 

i'd say 7075, used extensivly in aerospace and the areonautics industry. not that much more $$ than the 6061. and then you have the alclad alloys.
oh, not arguing there with yah peter

 

Looks like aluminum......but just to make sure send the "whole" brake system to me for evaluation. I will get them back to you in a few months along with the results of my extensive analysis!!

 

Hey Scott, Brian (lmp designer) suggested it might be 2024/2014 anodized.

No worries, mate! It's just fun to throw out ideas here. Good crowd to learn from...

-Peter

 

probably, we could guess all day and not know for sure. no problem

 

I really doubt it would be 2024 or 6061 or any 2 or 6 series of aluminum. They are very soft. It may be something in the 7's - 7075 maybe, but it's still much less strong than steel. The other thing with AL is they can age/heat harden and this isnt ideal for a brake component. There is also a lot less flex and flexing leads to cracking, there's not much springback in AL.

I'm guessing it's stainless. Especially considering it's threaded and has (what looks like cad) plated parts attached to it...

Are you asking because it rusted and you feel it shouldn't have? Stainless isn't rust-proof, it's just rust resistant. If you are looking to get a replacement made, definitely get the material checked out first.

 

I don't know, Mike. Every aftermarket kit I've ever installed, including the fabricated ones I buy for our sports racing cars, uses aluminum and not steel for the hat material.

Found this: "The so called brake hat is manufactured out of specially forged aircraft aluminium and also hard anodized. The mounting of the brake disc to the brake hat is done with a special titanium bolt setup. This setup will provide a maximum amount of strength and a minimum amount of heat transfer from the brake disc."

There are cast iton hats and steel hats available for the roundy-round crowd, but if you look at Brembo, Stop-Tech, Wildwood, Alcon, AP or any of the top line stuff, they're all aluminum...

-Peter

 

there you go peter, 7075 is mil-spec aircraft aluminum. probably T-6 hardened which would be fully aged and heat treated. to re-temper the aluminum would require temps over 1500* and i don't think thats going to happen with the hats. a natural hard ano will produce a gray/green cast look to 7075. the timing gear pullies i made are 7075 and hard ano, i went black becouse the gray/green looked to military camo. the above pictured most likely isn't hard anodized.

 

While my last race car was not a Ferrari, and also not as fast (top speed wise) it had Wilwood brakes on it ... and the hats were most definitely aluminium of some sort and with less 'metal' than those ones (ie. they had large cut outs).

Remember some race cars have aluminium steering components and wishbones, and also aluminium does not hold heat like steel or cast iron ...

It's only brake loads guys, not holding up a building or something. Do the calculations, there's probably not that much load on them.
Pete

 

But 2000 or 6000 series? They are both very soft and prone to cracking 7000 is 1/2 way (generally) between 6061 and steel in terms of weight and strength.

From the poster above it looks like its 7075. I thought the 7000 series did not anodize very well though - maybe it works for a hard anodize, but I know it doesn't take a cosmetic anodize, at least 7075 and 7051 dont.