The gloss of the steel strip is insufficient.

The surface gloss is different, the part is brighter, the part is darker, and the gloss between the upper and lower surfaces may be different.

A straight line along the rolling direction of the surface of the Dimension precision cold rolled steel coil has a different color than the steel strip.

Cold rolled crosscut	Plate thickness	Plate width	Processing length	Diagonal tolerance	Dimension precision
0.2-0.6	90-1800	200-6000	±0.5/2000	±0.3/2000	20
0.6-1.0	90-1800	200-6000	±0.5/2000	±0.5/2000	25
1.0-2.0	90-1800	200-6000	±1/2000	±0.8/2000	35
2.0-4.0	150-1800	200-12000	±1/2000	±0.8/2000	35
4.0-6.0	200-2000	400-12000	±1.5/2000	±1.0/2000	35