Cold Rolled Low Carbon (Mild) Steel

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Surface appearances and finishes
Symbol	Characteristics	Field of Applicatione	Surface finish
MA	Bright, metallically clean surface, pitting, small defects and scratches are permitted.	All thicknesses and treatment conditions.	FRR, RM, RL 2)
MB	Bright, metallically clean surface; pitting, grooves and scratches are permitted as long as the uniform smooth appearance is not substantially impaired when viewed with the naked eye.	Thicknesses =< 2.0mm in all conditions except A (annealed)	RM, RL 2)
MC	Bright, metallically clean surface; pitting, grooves and scratches are permitted as long as the uniform appearance of the mirror surface is not impaired.	Thicknesses =<1.0mm in all conditions except A (annealed).	SRN 2)
RR = rough, RM = matt, RL = smooth, RN = mirror 2) These code letters need not be given in the designation.