[TheForge] more than you ever wanted to know about hot vs cold rolled

Fri Dec 21 09:29:01 2001

Grant,
    What is the uniformity and "junkiness" of 1018?  By junkiness, I mean
unwanted inclusions.  I had thought to make a Crossbow prod out of 1018 and
superquench it, but was afraid the amount of slag and other impurities would
defeat the purpose of using low carbon, which was to extend bow life.  Fewer
Carbon atoms means less interstitial point defects to pin edge slip
dislocations which means work hardening SHOULD happen and a much slower
rate.  Comments or thoughts?

----- Original Message -----
From: "Grant Neil Sarver" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 20, 2001 10:27 PM
Subject: [TheForge] more than you ever wanted to know about hot vs cold
rolled


> Although the term "cold rolled" is in common usage to refer to cold
finished
> bar I don't believe any of it is actually rolled. The only mill product
that
> is truly cold rolled is is cold rolled sheet. Cold finished bar is all
drawn
> to size just like wire. Hot rolled bar is  generally annealed then
pickeled
> and oiled. From there it goes to the draw shop where it is pulled through
a
> hole in a carbide die. The hole is commonly 1/16 inch smaller than the
> original bar. The resulting bar is very close in size and almost perfectly
> straight due to the enormous tension it's under in pulling. Some very
> interesting shapes can be produced by this method too. I've had bar drawn
for
> me in special alloys and had to buy 13/16 hex  in order to produce 3/4 hex
> cold drawn. The reason 1018 is used in cold drawn merchant bar is that the
> quality (tensile strength, yeild strengh and elongation) is much more
> consistant than any A-36. 1018 and any number of "mild" grades can be had
from
> the mill or from a steel broker.
>
> grant (NAKED ANVIL)
>
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