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1. Basic shape and structural characteristics:
   • Ribbed form: Whether in China or other countries, the surface of rebar usually has rib patterns to increase the bonding ability with concrete. The shapes of rib patterns generally include spiral, herringbone, crescent, etc. This design concept of enhancing bonding force through rib patterns is generally similar.
   • Nominal diameter expression: In the definition and expression of nominal diameter, the standards of various countries are relatively similar. The nominal diameter of rebar usually refers to the diameter of a plain round steel bar with an equal cross-section. This concept is basically universal internationally, facilitating the understanding and communication of rebar specifications between different countries.
2. Basic requirements for mechanical properties:
   • Strength indicators: For the strength performance of rebar, all countries have corresponding requirements to ensure its reliability in building structures. For example, whether it is China’s standard or some mainstream foreign standards, certain numerical ranges will be set for key strength indicators such as the yield strength and tensile strength of rebar to ensure that the rebar can bear the load required by the design.
   • Elongation performance: Good elongation performance is one of the important characteristics of rebar, which is related to the deformation ability and toughness of the steel bar when under stress. Chinese standards and foreign standards usually stipulate indicators such as the elongation rate of rebar to ensure that the rebar has sufficient deformation ability in building structures and can adapt to a certain degree of deformation without brittle fracture.
3. Approximate ranges of chemical compositions:
   • Content of major elements: Carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), etc. are the main chemical compositions in rebar. The standards of various countries have certain limitations on the content ranges of these major elements. For example, the control of carbon content is to ensure the strength of the steel bar while avoiding the increase in brittleness due to excessive carbon content; the limitation of harmful elements such as phosphorus and sulfur is to prevent adverse effects on the performance of the steel bar.
   • Purpose of adding alloying elements: According to different usage needs and performance requirements, some foreign standards allow the addition of specific alloying elements such as vanadium (V), niobium (Nb), titanium (Ti), etc. in rebar. The Chinese standard and some foreign standards are similar in the purpose of adding alloying elements, which is to improve the strength, toughness, corrosion resistance and other properties of rebar.
4. Basic methods for quality inspection and acceptance:
   • Appearance inspection: For the appearance quality of rebar, the standards of various countries require inspection, including whether there are defects such as cracks, folds, scabs, and oil stains on the surface. Appearance inspection is the first checkpoint to ensure the quality of rebar, which can timely detect surface problems and ensure the safety of rebar use.
   • Mechanical property testing: Mechanical property testing methods such as tensile test and bending test are common quality detection means in various countries. By conducting tensile and bending tests on rebar, data such as yield strength, tensile strength, elongation rate, and bending performance can be obtained to determine whether the rebar meets the standard requirements.
   • Dimension measurement: Measuring the diameter, length, rib spacing and other dimension parameters of rebar is also an important part of quality inspection. The standards of various countries stipulate corresponding dimensional tolerance ranges to ensure that the dimensional accuracy of rebar meets the requirements of building construction.