[TheForge] Re: cold drawn steel

[theforge@mailman.qth.net]

Wouldn't heating it to critical temp undo any compaction?   I understand 
in as left the mill state the surface is compacted ( belt sand off one 
side of a cold rolled flat bar and let it sit for a while to see the 
effects) , but does the effect survive the forge?

Scott Lane wrote:

>> Once it is heated past critical temperature, there is absolutely no
>> difference from the "hot rolled" variety. I have forged many pieces 
>> of CF
>> steel up to 4" dia., and once it is hot it forges exactly the same. 
>> It only
>> acts kinky when you are trying to bend at a dull red, then the stiff 
>> spots
>> show up.
>
>         Wrong.  The surface of cold rolled is compacted during the 
> rolling process.  I've had to check this in the micrographs while cold 
> rolling stock at the steel plant.