how to mill cold drawn steel without pre-heat treatment to relieve stress?

how to approach cold drawn steel when milling it and making long and thin parts which typically would bend ouf ot shape in milimeters?

Personally, I don't know, but there is a similar (but old) thread here:

http://www.cnczone.com/forums/showth...pe%20machines?

You can fix it on the table with multiple clamping points while milling, this way to minimize the bending effect.