How to distinguish whether the packaging steel strip is qualified

1. For the appearance, color and surface quality of the packaging steel strip, place the monitored part of the packaging steel strip on the platform, and use a one-meter straight ruler against the concave side of the packaging steel strip, and measure the distance between the meter ruler and the concave side Maximum distance.
　　2. The coating film thickness and galvanized thickness of the packaging steel strip are measured with corresponding precision measuring instruments. The measuring position should be no less than 3 mm away from the edge of the packaging steel strip, with approximately equal intervals, and no less than 100 mm in length. Measure three points on each side, and the arithmetic average of the six test values u200bu200bis the thickness of the coating film or the thickness of the galvanized layer.
　　3. The test items, sampling quantity, sampling method and test method of each batch of packaging steel strips should comply with national regulations.
　　4. The sample for tensile test should meet the requirements of GB/T6397, and the sample adopts a full rectangular cross-sectional shape without machining. The original cross-sectional area is calculated according to the measured size.