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Old 09-15-2008, 08:15 PM
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question about steel types

A question about steel types
Does anyone know percentage wise in strength the difference between cold rolled plat and hot rolled steel? I fabricated a cross member and upper and lower suspension mountings using .25 in. steel. Then found out that what I used could be hot rolled steel when I thought it was cold rolled. In this application would there be a problem? Iím still in mock up on this truck project but thought I would check.

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Old 09-15-2008, 08:57 PM
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Hi,
check this out
http://www.spaco.org/hrvscr.htm
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Old 09-15-2008, 09:00 PM
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You will have no problems, the hot rolled is actually more user friendly than cold rolled, as it has much more chance to normalize after it has been rolled.

The strength is equal, as long as you are comparing similar compositions. 1018 as well as A36 can be cold rolled.

Cold rolled is full of internal stresses resulting from the cold rolling process.


later, mikey
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Old 09-15-2008, 09:18 PM
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A little more from my PDF catalog..

A36 has a tensile strength of 58000-65000 pSI, a yield point of 36000 psi and 23% elongation in 2" ..Hardness is 76 on the Rockwell B scale.

Carbon content, .26-.29, manganese .60-.90%


PDF sells only hot finished A36, in various shapes




1018 (PDF only sells cold rolled 1018 round bars, but the mechanical properties should be the same), has the following mechanical properties.

70000-80000 psi tensile strength, 55000-70000 yield point,
18-25% elongation in 2", and it is 87 on the Rockwell B scale.

.15-.20% carbon, .60-.90 manganese


So which composition of steel do you have? That would be where the difference in strength is.


Later, mikey
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Old 09-15-2008, 09:18 PM
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question about steel types

Thanks that makes it easier than re-doing the work even though its only tack welded. Itís over built by a 1/16 or more anyway since I had the steel.
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Old 09-15-2008, 10:30 PM
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question about steel types

Looking through receipts I had both thatís why it may be cold rolled, my best guess.
But the cross member is a 3Ē X 6Ē X 22Ē & .25 box and supports are small.
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Old 09-15-2008, 10:40 PM
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3 X 6 X .25? That crossmember would be strong enough for a cement truck...no matter what or how it was made.


Later, mikey
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Old 09-15-2008, 11:24 PM
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Quote:
Originally Posted by powerrodsmike
3 X 6 X .25? That crossmember would be strong enough for a cement truck...no matter what or how it was made.


Later, mikey
Sounds like some of the stuff I fab up.
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Old 09-15-2008, 11:56 PM
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I am also guilty of "overbuilding" things.

I have to take my engine stand apart just to load it in a pickup.
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