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How to distinguish plain round steel bar and ribbed steel bar?

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The difference between plain round steel bar and ribbed steel bar is mainly whether there is rib on the surface. This rib can be longitudinal force or transverse rib. If it is a steel bar with two longitudinal forces or a transverse rib evenly distributed along the length. However, for small-scale steel, cold-rolled ribbed steel bars fall into this category and are mainly used in the skeleton of reinforced concrete building components. If it is a steel bar with a certain mechanical strength or bending deformation, if the process welding performance is relatively strong, it is mainly used for domestic cold-rolled ribbed steel bars. The transverse ribs are mostly spiral, herringbone, and crescent-shaped steel bars. . From the perspective of specifications and appearance, the specifications are standard grades, the diameter of steel bars is expressed in nominal terms, and in terms of quality, it is expressed in nominal weight. If the specified length and the corresponding index tolerance come Said that the difference is also different, most of them are measured by the national standard, and generally consist of cold-rolled ribbed steel bars with different diameters of 6, 8, 10, and 12 mm. From the point of view of the quality of the surface, it can be seen that the end of the steel bar is cut very straight, and there will be no cracks on the surface, or there will be scars on the spot, and there will be no harmful material defects. In addition to the differences in specifications and surface quality, there are certain differences in the deviation of external dimensions, etc., which must be within the allowable value of the difference.