ML20 Cold Heading Steel Bar

 

ML20 ML15 is cold heading steel, see: GB / T 6478-2001 cold heading and cold extrusion steel

 

Specific composition:

 

C 0.18 - 0.23 Si 0.15 - 0.35 Mn 0.30 - 0.60

 

Cold heading performance is one of the important properties of cold heading steel. Cold heading steel should have the main performance is good cold forming; for cold heading steel, deformation to have as little resistance and possible high deformation capacity. 

 

In this case, in order to avoid surface cracking at the time of cold heading, the surface quality of the steel is required to be good, and the surface decarburization of the steel is as small as possible.