How to identify qualified packaging steel strip

1, the appearance of the packaging steel strip surface quality, colour and lustre and parts of the packaging steel strip by monitoring platform, with a metre long ruler on the concave side of the packaging steel strip, maximum distance measuring meter scale to the concave side. 2, packaging steel strip thickness and galvanized coating thickness measured with corresponding precision measuring instruments. The site measurement should be from the packaging steel strip edges is not less than 3 mm, roughly equal intervals, and the length of not less than 100 mm. Three measuring points on each side, the arithmetic average of the six test values, or the thickness of the zinc coating is the coating thickness. 3, the test items of each batch packaging steel strip, sampling quantity, sampling methods and test methods should be consistent with the provisions of the state. 4, tensile test specimens shall comply with the provisions of GB/T6397 sample used without machining of rectangular cross section shape. The original cross-sectional area calculation according to the measured size.