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GB/T 5223.3-2017: Steel bars for the prestressing of concrete Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 5223.3: Historical versions
GB/T 5223.3-2017: Steel bars for the prestressing of concrete---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5223.3-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.65 H 44 Replacing GB/T 5223.3-2005 Steel bars for the prestressing of concrete (ISO 6934-3.1991, Steel for the prestressing of concrete – Part 3.Quenched and tempered wire, NEQ) Issued on. FEBRUARY 28, 2017 Implemented on. NOVEMBER 1, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Classification, codes and designation... 7 5 Ordering content... 7 6 Dimensions, shapes, weights and tolerances... 8 7 Technical requirements... 13 8 Test methods... 15 9 Inspection rules... 18 10 Packaging, marking and quality certification... 19ForewordThis Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 5223.3-2005, Steel Bars for Prestressed Concrete. Compared with GB/T 5223.3-2005, the major technical changes are as follows. -- it cancels the common relaxation varieties of prestressed steel bars; -- it adds the specifications of steel bars (see Clause 6); -- it cancels cross sectional area measurement for plain steel bars and adds the specifications for diameter tolerances (see 6.1); -- it changes the cross sectional area measurement of helical grooved steel bars and helical ribbed steel bars into the weight per m measurement, and adjusts the weight tolerances for helical ribbed steel bars (see 6.2 and 6.3); -- it increases the requirement for coil weight (see 6.6); -- it adds the dimensional measurement for steel bars (see 8.2.1); -- the test method is changed into as specified in GB/T 21839 (8.4.1). This Standard was redrafted by referencing ISO 6934-3.1991, Steel for the prestressing of concrete – Part 3.Quenched and tempered wire. This Standard is not equivalent to ISO 6934-3.1991, the major technical changes are as follows. -- quenched and tempered steel wires are changed into steel bars for prestressed concrete; -- it adds helical ribbed steel bars; -- it adds strength levels; -- it adds the specifications of steel bars; -- it adds the indexes of elongation after fracture as a routine inspection item; -- it adds impact test for the helical ribbed steel bars for mine supporting projects. This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Steels of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. Shenyang Super Steel Bar Co., Ltd., Changshu Longteng Special Steel Co., Ltd., Fujian Sangang (Group) Co., Ltd., Tianjin Silver Dragon Prestressed Materials Co., Ltd., Huludao Beifang Metalware Co., Ltd., Baoding Sifangsanyi Electric Co., Ltd., Tianjin Iron and Steel Group Co., Ltd., China Metallurgical Information and Standardization Institute. The main drafters of this Standard. Guo Xirong, Wen Lixin, Wang Lingjun, Ren Cuiying, Ji Bingyuan, Wang Mingdi, Ai Tieling, Lv Yuheng, Qiu Yaohui, Qiao Zhiping, Wang Xiaotao, Zhou Jiandong, Xie Chonghu, Xu Kaishu, Liu Xuesen, Xie Ang, Wu Jianguo, Li Yabin. The previous editions of the standard replaced by this Standard are as follows. -- GB/T 4463-1984; -- GB/T 5223.3-2005. Steel bars for the prestressing of concrete1 ScopeThis Standard specifies the terms and definitions, classification, codes and designation, ordering content, dimensions, shapes, weights and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certification for steel bars for the prestressing of concrete. This Standard applies to plain, helical grooved, helical ribbed and ribbed round bars for the prestressing of concrete.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this document. GB/T 229, Metallic materials - Charpy pendulum impact test method GB/T 2101-2008, General requirement for acceptance, packaging, marking and certification for section steel GB/T 2103-2008, General requirements for acceptance, packing, marking and quality certification of steel wire GB/T 14981-2009, Dimension, shape, mass and tolerance for hot-rolled round wire rod GB/T 21839, Steel for prestressed concrete – Test methods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 quenched and tempered bar Steel bars which are made of wire rod by processing and heating to austenitizing temperature before rapid cooling, and then heating at the phase-transition temperature for tempering. 3.2 relaxation Time-dependent stress loss for a constant length. 3.3 plain bar Steel bars whose cross section is circular. 3.4 helical grooved bar Steel bars which have continuous helical grooves at regular spacings along the longitudinal direction of the surface [see Figures 1a] and 1b)]. 3.5 helical ribbed bar Steel bars which have continuous helical ribs at regular spacings along the longitudinal direction of the surface (see Figure 2). 3.6 ribbed bar Steel bars whose cross section is normally circular and whose surface is ribbed [see Figures 3a) and 3b)].4 Classification, codes and designation4.1 Classification Steel bars are classified into plain steel bars, helical grooved steel bars, helical ribbed steel bars and ribbed steel bars, in accordance with their shape. 4.2 Codes 4.3 Designation 4.3.1 Designation content The designation of the products delivered in accordance with this Standard shall include the following content.5 Ordering contentThe contract based on this Standard shall include the following content.6 Dimensions, shapes, weights and tolerances6.1 The dimensions, weights and tolerances of plain steel bars shall be as specified in Table 1.For the theoretical weights per m see Table 1. 6.2 The dimensions, weights and tolerances of helical grooved steel bars shall be as specified in Table 2.Their shape is as shown in Figures 1a) and 1b). 6.3 The dimensions, weights and tolerances of helical ribbed steel bars shall be as specified in Table 3.Their shape is as shown in Figure 2. 6.5 Steel bars of specifications beyond Tables 1, 2, 3, 4 and 5 can be manufactured as required by the purchaser. 6.6 Each coil of steel bars comprises one bar, whose weight shall not be less than 700 kg; 10% of the coils in each batch is allowed to be less than 700 kg, but not less than 200 kg.7 Technical requirements7.1 Raw material 7.1.1 The dimensions, shapes and tolerances of the wire rods for steel bars shall be as specified in accuracy grade B of GB/T 14981; the surface quality shall be as specified in GB/T 24587. 7.2 Manufacturing method 7.2.1 Quench and temper. steel bars are normally manufactured using hot-rolled wire rods as the material and then processed before quenching and tempering. The material of ribbed steel bars shall be as agreed on by the purchaser and the supplier. 7.3 Mechanical properties 7.3.1 Steel bars shall be subjected to tensile test. Their tensile strength and specified plastic elongation shall be as specified in Table 6; the elongation properties (including ductility level and corresponding elongation) shall be as specified in Table 7. 7.3.5 Fatigue test can be carried out for steel bars when it is as agreed on by the purchaser and the supplier and stated in the contract. 7.3.6 The elasticity modulus of steel bars is (200 ± 10) GPa, but it is not a condition of deliver. When the requirements of the purchaser are met, the range value shall be met. 7.5 Straightness Take a steel bar of chord length 1 m to place on a plane; the maximum natural rise of its chord and the arc inner side shall not be greater than 5 mm. In arbitration, use each coil removed one circle as the sample.8 Test methods8.1 Surface inspection Use visual inspection to check surface quality. 8.2 Dimension inspection 8.2.1 Use a measuring tool of division value 0.01 mm to measure the diameter of steel bars; measure on any section. 8.3 Weight per m measurement The weight per m shall be measured using the following method. take a steel bar of length not less than 300 mm, accurate to 1 mm for the measurement of the length of steel bars. Weigh the weight of each steel bar, accurate to 0.1 g; then calculate the weight per m in accordance with Equation (1). 8.4 Tensile test 8.4.1 Tensile strength The tensile strength of steel bars shall be determined as specified in GB/T 21839. During the calculation of tensile strength, take the nominal cross sectional area of steel bars. 8.4.5 Elasticity modulus The elasticity modulus shall be determined as specified in GB/T 21839. 8.5 Repeated bending test The repeated bending test for the steel bars of nominal diameter not greater than 10 mm (except helical grooved steel bars) shall be carried out as specified in GB/T 21839. The bending radius shall be as specified in Table 6 of this Standard. this Standard. 8.7 Stress relaxation property test 8.7.1 The stress relaxation test for steel bars shall be carried out as specified in GB/T 21839. 8.7.2 The environmental temperature of the sample during the test shall be maintained within the range of 20°C ± 2°C. 8.8 Fatigue test 8.8.1 The sample for fatigue test shall be cut out directly from finished steel bars; the length of the sample shall ensure the distance between two clamps is not less than 140 mm. 8.8.2 Steel bars shall withstand, without failure, 2 × 106 cycles of 0.7Fm ~ (0.7Fm - Fr) pulsating load. Plain steel bars. Fr/Sn = 200 MPa Helical grooved, helical ribbed steel bars and ribbed steel bars. Fr/Sn = 180 MPa9 Inspection rules9.1 Inspection and acceptance The factory inspection of products shall be carried out by the quality inspection department of the supplier in accordance with Table 8; the purchaser can carry out inspection and acceptance in accordance with this Standard. 9.3 Inspection items and sample quantity The sample quantities and sampling locations and test methods for the test items of each batch of steel bars shall be as specified in Table 8. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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