Different Metals?
 

Hey all,

What is the difference between 300M and E4340?

Thanks!

Why do you ask? What do you intend to do with the metals? Weld? Bend? Form? Machine?

And where do you intend to use them? Roll Cage? Frame rails? Floor pan? Sheet metal patches? Formed sheet metal parts?

http://www.suppliersonline.com/propertypages/300M.asp

Apparently they are about the same material, from the link above:

"Principal Design Features
300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (280 to 305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy."

http://www.suppliersonline.com/propertypages/4340.asp

I was looking at:

http://www.spidertrax.com/Ultimate-300M-Axle-Shafts

We start with only the finest US grade 300M (used for the axle shafts) and aerospace grade E4340 (used for the yokes) billet chromoly

It just seemed that there was a reason for their assertion and I could not place my finger on why.

The reason why I was looking is Oliver rods uses E4340, Dyer rods use forged 300M, Cosworth uses 4340, Pauter uses billet E4340 or titanium, while R&R Racing Products and Saenz Performance puts the options out for the customer to decide. Manley uses 4340 in their "lightweight" rods and 300M in their dirt series. To top it off, Carrillo uses Carrilloloy (a proprietary blend of steel).

In terms of a connecting rod, it looks like 300M > E4340. Can anyone confirm?

Pankl steel rods for Ferrari use P100 steel.
http://www.shop-pankl.com/connecting...ari-f430-3233/

Pankl owns the CP & Carillo brands
http://www.pankl.com/Aftermarket.542.0.html

Carilloloy maybe P100?