Originally Posted by Drayke
1018 is one of the most basic of mild steel alloys. but yes, it refers to the grade/classification of the steel.
I agree. 1020 is DOM, so what you bought isnt DOM.
1018 is Cold Rolled which is better than hot rolled but not as strong as DOM.
The carbon content is .18% hence the 1018
Cold Rolled is used in sliders/bumpers/etc
DOM is normally always used in links and most of the time in shock hoops and other critical applications.