Cold Rolled Ribbon Ribbed Steel Bars Dimensions, Weight and Tolerances (GB 13788-2000)
Cold rolled ribbon ribbed steel bars, commonly referred to as ‘ribbed steel bars’ in technical specifications, are bars produced by cold rolling open round billets manufactured in steel mills. Ribbed steel bars are extremely versatile, being used in virtually all building structures, and in the repair work of existing buildings. By virtue of the alloying quality of the base steel and the presence of the ribs on its surface, the steel bars have a much higher resistance to twisting, deformation and add strength to the structure. As such, technology and industry need to ensure conformity of product dimensions, weight and tolerances that manufacturers adhere to when producing which covered by the industry regulation GB 13788-2000.
The GB 13788-2000 sets the standards to be followed when manufacturing cold rolled ribbon ribbed steel bars. The standard covers all necessary aspects, including dimensions, weights and tolerances in six sections. Section one of the document explains the scope of the standard which also applies to ribbed bars with a plain round section that are produced in a thermally deformed state.
Section two of the standard lays out the definitions of all terms used within the document and the terminology in reference to cold rolled ribbed steel bars specifications. This section also lists any abbreviations used to define steel types in specified standards. Section three details the standard for the sizes and shapes of the plain round products. The physical size, length and diameter of the steel bar are all discussed as are the limits for variations between them. This section also explains the ideal geometric curvature measurements within a single steel bar and when placed in bundle form.
The fourth section of the document pertains to the tolerances for weights of steel bars and the sections discusses permissible variations of mass that is allowed. The fifth section of the standard explains how the heat shock test should be conducted, what the requirements are and how the results are calculated. Finally, the sixth and last section of the document outlines the allowable tolerances for straightness, the limit of flatness and length.
The GB 13788-2000 is an important document that defines the dimensional and weight requirements that are to be followed when manufacturing cold rolled ribbon ribbed steel bars. Not only does this guarantee the quality of the products, but adherence to the standard ensures that the customer receives the correct number of items in the size and shape that was specified. The document is an essential document for manufacturers and customers alike.
