1, folding is a variety of broken lines formed on the surface of steel, which often runs through the longitudinal direction of the whole product. The reason for the folding is due to the high efficiency of the fake and inferior manufacturers, the big pressure, the ear, the folding when the next rolling is rolled, the folded product will crack after the bending, and the strength of the steel drops greatly.
2. The appearance of fake and inferior steel often has a facial appearance. Because of the serious wear of the groove, the surface of the steel is irregular and uneven. Because of the pursuit of profit by the inferior and inferior steel manufacturers, rolling groove rolling often exceeds the standard.
3, the surface of fake and inferior steel is easy to produce scars. There are two reasons: 1. the material of the inferior steel is uneven and the impurities are numerous. 2. Counterfeit and inferior materials manufacturers are weak in guiding equipment and easy to stick to steel. These impurities tend to produce scars after biting the roller.
4, the surface of the fake and inferior material is easy to crack. The reason is that the blank is the billet and the air hole is more. The crack is caused by the thermal stress in the process of cooling, and after rolling, there are cracks.
5, shoddy steel easy to scratch, the reason is that fake and inferior materials manufacturers are simple equipment, easy burr, scratch the surface of steel. Deep scraping reduces the strength of the steel.
6, shoddy steel has no metallic luster, it is light red or similar to pig iron color, the reason is that its blank is adobe.
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