Nominal thickness yield strength (Mpa) tensile strength (Mpa) elongation A50mm% 180 degree bending test >:1.5-2.5 ≤ 290 ≥ 310 ≥ 38d = 0a > 2.5-3.0≤290≥300≥38d = 0a & gt； 3.0-4.0 ≤ 290 ≥ 300 ≥ 40d = 1/2a Description:1. The tensile test and bending test listed in the table are applicable to longitudinal sample 2. The tensile test adopts sample 10 = 50 mm, and b = 25 mm The sampling scheme of bending test shall be based on sample No.3 in JIS Z 2248, and the test method shall be as follows. The actual value is provided in the warranty, but it is not required for acceptance. 3.3 Surface Quality 3.3. 1 Inclusion, crack, rust and other defects harmful to use are not allowed on the surface of steel plate or steel strip, and parking spots are not allowed. Defects that do not affect the molding performance are allowed, such as slight scratches without hand feeling, light yellow film after pickling, slight pits, scratches, roll marks and indentations, color difference and slight wrinkles without hand feeling. 3.3.2 As the steel strip has no chance to eliminate defects, delivery with defects is allowed, but the defective part shall not exceed 6% of the total length of steel coil. 3.3.3 Oiling refers to coating the surface of steel plate with electrostatic antirust oil with certain antirust performance. Oil injection is divided into light oil injection, medium oil injection and heavy oil injection, which are stipulated by the buyer in the contract. Under normal transportation and storage conditions, the supplier shall ensure that the oiled products will not rust within 3 months.