I agree 4140 is probably a better choice and should be available in the size
you require (you can definitely get rod in the 6"+ diameter range however I
have not bought any 2" thick plate). 4140 would definitely be my choice when
compared to 4130 for a crankshalf -- particularly if you need to heat treat
it. Have a read of the differences between 4130 and 4140 in MIL-HDBK-5 or
USAF T.O. 1-1A-9 Metals Handbook and I am fairly sure you will be convinced.
You can download copies of both these publications.
Try Samuel (
http://www.samuel.com/) for the 4130 but I am fairly confident
that you will not find what you are looking for in 4130 because in the
section sizes you specify most people would use 4140 and thus there would
be no call for 4130. 4130 is primarily a sheet material up to approx 1/4"
max in plate. You can get rod up to approx 2" dia. Samuel are a large
supplier of aircraft metals including 4130.
"@(none)" ""root\"@(none)" wrote in message
...
Tom Young wrote:
I'm looking for a piece of 4130 normalized that's 2" thick by 6.5" wide
by
8" long (larger is okay). I've tried Fry Steel, Online Metals, Metal
Express, Metal Supermarkets, and a few other -- no luck. My project
(crankshaft) is fairly specific as to alloy and treatment. Any
suggestions?
-Tom
Oliver Steel Plate in Ohio will have what you need. I regularly buy
1.75, 2, and 2.5 inch steel plate from them in 4140 and 4340,
(annealed). 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.
Now to the gratuitous and unsolicitaed comments. 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.
I won't bore everyone here with a comparision of different alloys
suitable for crankshaft use but if you are interested, just holler.
Kevin