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Hot Rolled Steel Bar for Prestressed Concrete (GB4463-1984)
Prestressed concrete is a general term for concrete structures prestressed by artificial means. In order to meet the needs of various large-span engineering structures, prestressed concrete has become an important type of reinforced concrete structure. According to the different Prestressed Force Mode, trestressingforce mode is mainly divided into two categories: pre-tensioning and post-tensioning. Regardless of pre-tensioning or post-tensioning, in addition to the necessary ordinary reinforcing bar, unsheathed steel bar, prestressed concrete steel bar is also one of the necessary components.
GB 4463-1984 Hot Rolled Steel Bar for Prestressed Concrete is the industrys national standard for the production of prestressed steel for prestressed reinforced concrete construction. This standard stipulates the requirements for the raw materials, chemical composition, mechanical properties and the manufacture of steel bars for prestressed concrete.
The raw material of the prestressed concrete steel bar is made of high quality carbon structural steel through hot rolling and is widely used in power and water conservancy projects. Hot-rolled steel bar used in prestressed concrete should have good plasticity and uniform composition, and its surface should be smooth and not have any defects. The chemical composition of the steel should comply with the requirements stipulated in the national standards. The mechanical properties of hot-rolled steel bar for prestressed concrete should meet the requirements of tensile strength, yield strength, elongation and impact toughness.
The production process of hot-rolled steel bar for prestressed concrete should meet the requirements of the national standard. The hot-rolled steel bar for prestressed concrete produced by the manufacturer should be mold-compartmented and clearly indicated the name or trademark of the manufacturer, product name or grade, specification, heat number, mechanical performance, etc., and the surface of the steel bar should be cleaned.
At present, the application of hot-rolled steel bars in the field of prestressed reinforced concrete construction is more and more extensive, and the quality of products has been constantly improved, making the application of hot-rolled steel bar more comprehensive and comprehensive in the civil engineering field. It is a symbol of the development of the contemporary reinforced concrete industry.
GB4463-1984的《预应力混凝土用热处理钢筋》是产生用于预应力混凝土加固施工的行业国家标准。这个标准规定了用于预应力混凝土的钢筋的原材料、化学成分、机械性能以及加工的要求。
预应力混凝土用钢筋的原材料是采用优质碳素结构钢经过热轧制而成，广泛应用于电力和水利工程中。预应力混凝土用热处理钢筋应具有良好的塑性及均匀的化学组分，其表面应光滑，无任何缺陷。钢的化学成分应符合国家标准的要求。预应力混凝土用热处理钢筋的机械性能应满足拉伸强度、屈服强度、伸长率及冲击韧性等要求。
预应力混凝土用热处理钢筋的生产工艺应符合国家标准的要求。生产企业生产的预应力混凝土用热处理钢筋应模具分切，明显标明生产企业名称或商标、产品名称或牌号、规格、炉号、机械性能等，其表面应清洁。
目前，热轧钢筋在预应力混凝土加固施工领域的应用越来越广泛，产品的质量也在不断改善，使热轧钢筋在民用工程领域的应用更加广泛综合，其成为当代钢筋混凝土工业发展的一个标志
