There are some ways to help you identify the genuine of rebar coil, as follows:
First of all, judge from the surface of the steel. You can use a vernier card measuring tool to simply measure whether the actual size is about one specification or more smaller than the marked size (generally, there are specification marks on rebar) (such as the standard inner diameter of Ø12 rebar is 11.5 ±0.4mm, while the inner diameter of fake and inferior rebar is mostly about 10mm). At the same time, some fake and inferior rebars deceive people's vision by rolling them flat, so they are oblate and oval when viewed from the end face of the steel bar, while the end face of the regular steel bar should be basically round.
What’s more, from the perspective of surface quality, fake and inferior rebar is rolled with adobe, and its surface quality is poor, often with defects such as scarring, and has an overall rough feeling. At the same time, due to insufficient heating temperature and rolling speed in some small rolling mills, the surface color is reddish.
In addition, regular steel products are mostly packaged in large bundles when they leave the factory, and there are metal signs corresponding to the real objects on the bundled steel products, indicating the manufacturer, steel grade, batch number, specification and inspection code, etc. However, due to the poor production conditions and no large-scale hoisting equipment, most of the fake and inferior steel bars are packaged in small bundles (about ten bundles) or in bulk, with no metal signs and no quality assurance certificates.
Finally, sampling for inspection.

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