I. Mechanical properties:
1.1 yield strength ≥ 270n / mm2
1.2 tensile strength ≥ 350 n / mm2
1.3 elongation ≥ 37
1.4 hardness: hv0.3: 130 ~ 150
1.5 the bending center diameter of steel plate for coating bending test is specified in the table below. After 180 ° bending, the outer surface of the sample shall be free of coating peeling, but the coating peeling within 6 mm from the edge of the sample is allowed. The width of bending sample shall not be less than 50mm during arbitration
| Grand | 180 Degrees bending test |
| Bending diameter | |
| DC51D+AZ | 1a |
II. Appearance and dimension requirements:
2.1 diagonal length difference is not more than 1.5mm
2.2 thickness deviation:
| Grand | Nominal Thickness (mm) | Allowable thickness tolerance(mm) | |
| 700-1000mm Width | 1000-1250mm Width | ||
| DC51D+AZ | 0.35-0.4 | +-0.05 | +-0.06 |
2.3 tolerance of unevenness:
Edge waviness of height: less than 3mm width waviness of height: less than 3mm height warpage: less than 3mm
Edge waviness of steepness and slowness: less than 1.0%; width waviness of steepness and slowness: less than 0.5%
2.4 the coating shall be fine and uniform, bright and clean without scratch marks (slight scratch shall not expose the underlying metal), and the thickness of the coating shall be greater than 50um. A kind of
2.5 the coating is not allowed to have blisters , cracks, peeling, pinholes, spongy layer and other defects; the galvanized parts are not allowed to have chromic acid water trace (blue and white phenomenon is allowed).III.Packaging requirements of products
3.1 for the packaging of batch steel plates, two schemes of ordinary packaging or wooden box packaging can be selected.
3.2 the packaging of steel plate shall be rust proof and moisture-proof. A kind of3.3 the sign shall be placed at the obvious place of the package, and the text and pattern of the sign must be printed clearly and neatly. A kind of
3.4 the outer package shall indicate the product name, specification, model, quantity, color card number, production batch number, production date, etc. 4.5 there shall be product inspection certificate in the packing box.
