How to tell difference between Hot-rolled steel and col-rolled steel

[zwwzli]

I am assigned a job to check some materials of steel sheet.
Is there anyone here can help me to tell it by just looking?

I know hot-rolled has rougher surface than cold, but anthing else?

Thank you so mcuh!

 

[Gokul43201]

I know hot-rolled has rougher surface than cold, but anthing else?

That's the surest way of telling (and usually, hot-rolled steel is more likely to have rusted). Also, no sheet that's 3/16" or thicker (roughly thicker than gauge 7) can be a cold-rolled sheet.

 

[zwwzli]

thank you Gokul 43201.