cold rolled or hot rolled? (1 Viewer)

Joined
Feb 21, 2005
Messages
515
Location
granger, indiana
I was in the hardware store yesterday and found some 3/4" round steel for my steering shaft for ps conversion. They had hot rolled(hr) and cold rolled (cr). which one and why? I was going to have a keyway cut into it for the ujoint yokes and probably weld on it also. Thanks for your input. Tom
 
Joined
Jul 19, 2004
Messages
880
Location
Olympia, WA
Other than one being easier to work than the other, what are the differences?
 
Joined
Jan 19, 2003
Messages
688
Cold rolling changes the grain structure of the steel, generally making it harder (stronger) and less ductile. If you had to machine it or tap it, a cold rolled steel would be harder to work with. Steels that have been heavily cold rolled are often tempered to bring back some ductility but all this is moot given your application. There is no way you are going to torque that 3/4" round piece of steel, whether cold-rolled or hot-rolled.
 
Joined
Sep 28, 2003
Messages
3,961
Location
Crawlorado.com
Website
www.crawlorado.com
Joined
Dec 24, 2003
Messages
494
Location
SE Iowa
Generally, cold rolled is drawn from hot rolled. HR may be a little oversized for this application and need to be machined to size. CR will be fairly precise and damn near perfectly round. When CR is drawn, it is pulled through a carbide die that is made to very exacting tolerances. 3/4" diameter may go in the die at .780" and come out at .749".

Really, it is an interesting process to watch (for about 10 minutes). Unfortunately, I spent about 9 months working in a place that did nothing but cold draw steel. I was one of the guys setting up the dies to be used and later on, I was in maintenance, where I had to fix these monstrous pieces of machinery.

Probably a little more info than you needed, but knowledge is never a bad thing in my book. HTH.

Tony
 

rusty_tlc

Dain Bramaged Member
Joined
Jun 23, 2005
Messages
13,859
Location
Reno, NV
Website
forum.ih8mud.com
You might want to consider getting an actual steering shaft with a slip section. This will allow for some movement between the body and frame if you get flexy. I had a solid shaft and ran into problems.
You can get them at Summit.
 
Joined
Feb 1, 2002
Messages
3,322
Location
No. Ogden, Utah
Website
www.instagram.com
cheap 40 said:
Generally, cold rolled is drawn from hot rolled. HR may be a little oversized for this application and need to be machined to size. CR will be fairly precise and damn near perfectly round. When CR is drawn, it is pulled through a carbide die that is made to very exacting tolerances. 3/4" diameter may go in the die at .780" and come out at .749".

Really, it is an interesting process to watch (for about 10 minutes). Unfortunately, I spent about 9 months working in a place that did nothing but cold draw steel. I was one of the guys setting up the dies to be used and later on, I was in maintenance, where I had to fix these monstrous pieces of machinery.

Probably a little more info than you needed, but knowledge is never a bad thing in my book. HTH.

Tony
Right you are, about the knowledge part. Thanks.
 

Users who are viewing this thread

Top Bottom