Cut Surface Cold Coil Steel

The defects are blocky, generally white, and easy to concentrate on a certain length of the steel strip.

Since foreign matter (such as backing paper, rubber particles) cut surface cold coil steel is rolled into the surface of the steel strip, a large-area, block-like defect is formed.

There are two layers of cracks on the cut surface, but there is no separation.

Air bubbles remain on the surface of the steel strip during steelmaking and hot rolling.

Irregular “tongue”, “fish scale” or strip-shaped metal layering on the surface, some connected with the steel plate body, some are not connected with the steel plate body, the front is called the open knot, the latter is called the closed mouth The knot is closed, and the closed knot is easily peeled off during rolling, so that the surface of the sheet becomes a pit.

Structural Grades	C	Mn	P	S	Cu	Ni	Cr	Mo	V	Cb	Ti
30,33,36,40	0.25	0.9	0.035	0.04	0.2	0.2	0.15	0.06	0.008	0.008	0.025
36T2,45-80	0.25	1.35	0.035	0.04	0.2	0.2	0.15	0.06	0.008	0.008	0.025

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