Big chunk of 4130 -- source needed

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

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Tom Young
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I'm looking for a piece of 4130 normalized that's 2" thick by 6.5" wide by
8" long

Aircraft Spruce.
(800)861-3192

www.aircraftspruce.com

Charley Vogelsong.

QDurham wrote:

I'm looking for a piece of 4130 normalized that's 2" thick by 6.5" wide by
8" long

Aircraft Spruce.
(800)861-3192

www.aircraftspruce.com

I'll call and see if they do special orders, but there's nothing that
approaches that in their catalog.

-Tom

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Tom Young
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Tom Young wrote in message ...
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
Try Speedy Metals in Milwaukee 262-784-4140 or
Sharairo Supply in St. Louis 1-800-833-1259

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

Try Transtar Metals in LA, They have provided me with small cuts of
large dimension Aluminum

(323) 321-1700

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

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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smjmitchell wrote:

4140 would definitely be my
choice when compared to 4130 for a crankshalf -- particularly if you need
to heat treat it.

I can't defend 4130 on all counts, but the crank uses antifriction bearings,
so high hardness is not a requirement. This probably influenced the
material choice. Further heat treatment is not called for in the plans.

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.

Thanks for the references. I'll check them out.

Try Samuel (http://www.samuel.com/) for the 4130...

I'll give them a try.

--
Tom Young
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