The annealed annealed cold steel sheet steel sheet surface exhibits an irregular or island-like black, brown pattern.

The emulsion is not exhausted at the exit of the rolling mill, and carbonized upon heating to form spots;

The end of the rack outlet hair dryer pressure is small, blowing is not clean. The rolling mills used for cold strip steel include two-high mills, four-high mills and multi-high mills. The most widely used is the four-high mill.

Common Grades	C	Mn	P	S	Cu	Cr	Mo	V	Cb
CSA	0.1	0.6	0.03	0.035	0.2	0.15	0.06	0.008	0.008
CSB	0.02-.15	0.6	0.03	0.035	0.2	0.15	0.06	0.008	0.008
FSA	0.1	0.5	0.02	0.035	0.2	0.15	0.06	0.008	0.008
EDDS	0.02	0.4	0.02	0.02	0.2	0.15	0.06	0.1	0.1