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Inspection requirements for cold rolled non grain oriented steel products
Nov 29, 2018

Firstly, the flatness of the surface of cold rolled non grain oriented steel product must be kept within the allowable range, the steel strip is taken up neatly, the height of the partial overflow side is less than or equal to 3 mm, and the height of the tower inner diameter of the inner diameter of the steel coil is less than 15 Equal to 10 mm. The thickness of the steel strip used for the re-rolling of the bell annealer should be less than 1 mm.

Secondly, after the cold rolling treatment, the cold rolled non grain oriented steel products with local ultra-wide width need to be finished: the ultra-wide part or all the trimming treatment is performed; the partial overflow height exceeds 5 mm and more than 3 places (excluding The steel coils of the inner and outer rings shall be finished. In addition, the user should perform the finishing process when required.

At the same time, the edge portion of the cold rolled non grain oriented steel products must be free from bumps, flashes and burrs. The crack depth is less than 1 mm; the serrated edge (or notched edge) should be less than 1 mm deep, allowing a small amount of serrations and notches with a depth of less than 1 mm, but no more than 10. The steel coil has no collapse, no local shrinkage deformation, wrinkles, and the inner circle ovality is less than or equal to 15 mm.

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