As per the thread title. I need to find a source for Chrome Moly at challenge friendly pricing.
Steve
As per the thread title. I need to find a source for Chrome Moly at challenge friendly pricing.
Steve
I'm not trying to be argumentative, just asking: Is the application so highly optimized on a strength to weight basis that using 1018/1020 ERW is out of the question?
Control arms for a formula car, for example?
Isn't that an oxymoron?
Whatever it is, stay FAR away from any place that says the Chinese moly is "good" or "is the same as the German or USA moly". It's bullE36 M3 junk material.
Have you tried AED out of Indy?
Wick's aircraft?
Dillsburg Aeroplane Works was ground zero for CrMo on the east coast forever, but I've heard he's getting material from offshore now. Probably worth a shot if you're local though.
motomoron wrote: I'm not trying to be argumentative, just asking: Is the application so highly optimized on a strength to weight basis that using 1018/1020 ERW is out of the question? Control arms for a formula car, for example?
Couple of reasons, we may produce these which means you cannot be too strong.
Weight matters
Breakage on these parts is not rare.
I am making significant power and grip.
Try Left Hander Chasis. There good people and priced good if you don't need a 24ft long section. https://lefthanderchassis.com/v2a/viewproduct_group.asp?idgroup=2513746
If you need or want full sticks Marrmon Keystone https://www.marmonkeystone.com/ecomm/servlet/HomepageServlet
motomoron wrote: Wick's aircraft? Dillsburg Aeroplane Works was ground zero for CrMo on the east coast forever, but I've heard he's getting material from offshore now. Probably worth a shot if you're local though.
Plus one for Dillsburg Aeroplane Works.
Been a few years now but AFAIK they still don't have a website but request a catalog and phone order. They ship up to 8' UPS or will arrange truck freight for lengths. I picked up and trailered my last lengths, I never used the truck freight.
Dillsberg sells chinese tube now.
Seriously try AED or find someone who sells ProMoly by Plymouth Tube.
Aircraft Spruce and Specialty!
They sell all sorts of sizes, it's US-made 4130, it can be aircraft-certified grade if you need it.
motomoron wrote: I'm not trying to be argumentative, just asking: Is the application so highly optimized on a strength to weight basis that using 1018/1020 ERW is out of the question? Control arms for a formula car, for example?
Yeah I was kinda wondering the same thing cause if you don't treat the welds right you may as well buy mild steel.
http://www.arc-zone.com/blog/joewelder/2009/01/08/metal-of-the-month-chromoly/
Do you have a decent local steel distributor? I get everything at O'Neal Steel here. If I lived somewhere else, I'd go somewhere else. Unless you buy in large quantities, mail ordering raw materials doesn't seem like a winning proposition.
The problem with 4130 steel is that once you weld it the welds are the weakest part unless you have the piece heat treated. Since I don't have access to a heat treat furnance I use mild steel. I used to use4130 but now I would only use it if the piece needs to be light weight and can be made with a minimum of welding to make it.
On suspension parts I prefer the part to bend rather then break if something bad happens and Chrome-moly will cause suspension mounts to break/fail before the part does or the part will fail at the welds. A 1018 steel part will bend quite a bit before there is a failure of the material or weld.
If you don't need long pieces, go to garage sales and but a couple old mountain bikes. Newer bikes are mostly Aluminum frames, but in the 1990s most bikes had chromoly tubing.
Only snag with that is either the tubes are pretty tiny diameter (maybe 1" except for the head tube or bottom bracket, both of which MIGHT be 4-5" long at best and are either threaded or have bearing races in them... although that gives me an idea...
) or pretty thin wall.
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