Intermittent black strips within 20mm from the edge of the strip
The traces of rolling oil remaining on the surface of the steel strip are in the shape of a comet, a spot, or a broom.
The surface of the steel strip has traces of lubricating oil, which is dark brown or brown.
It has the advantages of high production efficiency and large output, but the investment is large.
A black gel-like object is attached to the cold steel coil transportation.
In the process of cold steel coil transportation, seawater or rainwater is introduced, and then cold-rolled and annealed to form a block of water-like defects.
GRADE | C% max | Mn% max | P% max | S% max | Alt% min | Ti max |
SC2 | 0.06 | 0.35 | 0.025 | 0.025 | 0.015 | 0.20 |
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