none wrote:

Oliver Steel Plate in Ohio will have what you need.

Thanks, I'll give them a try.

You probably will have a very hard time finding plate in the
N condition in the thickness that you desire. Most places that sell
thick plate flame cut it (CNC cutters) and then anneal it. Basically,
nobody wants to saw thick plate.

Really? I'd think proper annealing would take more time and better furnace
control than renormalizing, if I understand the processes correctly.

I know that you say
that your project has specific alloy and treatment (heat treatment?)
requirements, but I believe that you will find that 4130 is a less that
ideal choice for a crankshaft. In nearly every particular related to
crankshafts, 4140 is a better choice. Besides, it is actually available,
something that can not always be said for 4130.

One thing worth mentioning is that the pin and main bearings in this design
are ball and roller (respectively), so wear resistance of the crank isn't a
big issue. Given that, it may be that the designer was going for 4130's
better fracture toughness. I'll ask him.

I won't bore everyone here with a comparision of different alloys
suitable for crankshaft use but if you are interested, just holler.

I, for one, wouldn't be bored.

--
Tom Young
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