Due to the roll change, the stop roller has a straight line of full width left on the surface of the steel strip, and generally the thickness of the front and rear will be too large.

Sometimes graphite cold rolled steel coil is black, sometimes white, strip or wavy, and sometimes blocky. Some touch it by hand and there will be powder on the hand.

Traces produced by the contact of the graphite roll of the heat treatment furnace with the steel strip.

Surface Finish:

	Symbol	Remarks
Dull finish	D	A matt finish produced with a roll roughened its surface mechanically or chemically.
Bright finish	B	A smooth finish produced with a roll finished its surface smoothly

Temper Grade: Both bright annealed and black annealed available.

graphite cold rolled steel coil