GB/T 5223.3-2017Steel bars for the prestressing of concrete (English PDF)
预应力混凝土用钢棒
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Issued by
AQSIQ; SAC
Level / Type
National · Recommended
Issue date
February 28, 2017
Implementation date
November 1, 2017
Scope
GB/T 5223.3-2017 is the English-translated version of 预应力混凝土用钢棒.
This 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. It applies to plain, helical grooved, helical ribbed and ribbed round bars for the prestressing of concrete.
Document preview — GB/T 5223.3-2017
National Standard of the People's Republic of China
- ICS
- 77.140.65
- Classification
- H 44
- Replacing
- GB/T 5223.3-2005
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.
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Terms and definitions5
- 4 Classification, codes and designation7
- 5 Ordering content7
- 6 Dimensions, shapes, weights and tolerances8
- 7 Technical requirements13
- 8 Test methods15
- 9 Inspection rules18
- 10 Packaging, marking and quality certification19
Foreword
This 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);
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 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).
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:
1 Scope
This 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 references
The 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.
3 Terms and definitions
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.
Time-dependent stress loss for a constant length.
Steel bars whose cross section is circular.
Steel bars which have continuous helical grooves at regular spacings along the longitudinal direction of the surface [see Figures 1a] and 1b)].
Steel bars which have continuous helical ribs at regular spacings along the longitudinal direction of the surface (see Figure 2).
Steel bars whose cross section is normally circular and whose surface is ribbed [see Figures 3a) and 3b)].
Uniform continuous rib parallel to the axis of steel bars.
Other ribs not parallel to the axis of steel bars.
4 Classification, codes and designation
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:
Prestressed steel bar, nominal diameter, nominal tensile strength, code, ductility level (ductility 35 or 25), low relaxation (L) and standard number.
4.3.2 Example for designation
Example: The helical grooved steel bar for the prestressing of concrete, of nominal diameter 9.0 mm, nominal tensile strength 1 420 MPa and ductility level 35, is designated as: PCB 9.0-1420-35-L-HG-GB/T 5223.3.
5 Ordering content
The contract based on this Standard shall include the following content:
a) a reference to this Standard;
NOTE: Theoretical weight per m = nominal cross sectional area × steel density for calculation; at the theoretical weight per m, the density of steel bars is 7.85 g/cm3.
6 Dimensions, shapes, weights and tolerances
NOTE: Helical ribbed steel bars have 4 helical ribs.
NOTE 1: The bevel angle of longitudinal rib θ is 0° ~ 30°. NOTE 2: Dimensions a and b are for reference.
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.
NOTE: Dimension b is for reference.
6.7 Normally, the diameter of the inner ring of steel bars shall not be less than 2 000 mm. Products of other inner coil diameters can also be supplied as agreed by the purchaser and the supplier.
7 Technical requirements
7.1 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. 7.1. […]
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.
Finished steel bars shall be free of welded joints; the welded joints for continuous operation during production shall be cut off.
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. 7.3.2 Steel bars shall be subjected to bending test (except helical grooved steel bars) and their properties shall be as specified in Table 6. 7.3.3 Steel bars shall be subjected to the relaxation test for 1 000 h at initial stress of 70% of the nominal tensile strength. If requested by the purchaser, the relaxation at 1 000 h shall also be determined at initial stresses of 60% and 80% of the nominal tensile strength, which shall be as specified in Table 6. When the helical ribbed steel bars 16 mm ~ 22 mm are used for mine supporting projects, in addition to Tables 6 and 7, they shall also satisfy that the elongation after fracture is not less than 10%, L0 = 5Dn, that the maximum force total elongation is not less than 3.5%, and that the room temperature impact absorbed energy (KV2) is not less than 30 J. 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. […]
8 Test methods
8.1 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; […]
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).
M – weight per m of steel bar, in g/m;
m – weight of steel bar measured, in g;
L – length of steel bar, in mm.
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.
8.4.2 Specified plastic elongation strength
The tensile strength of steel bars shall be determined as specified in GB/T 21839. During the calculation of elongation strength, take the nominal cross sectional area of steel bars. The value of Rp0.2 shall be determined for specified plastic elongation strength.
8.4.3 Elongation after fracture
The elongation after fracture shall be determined as specified in GB/T 21839; the elongation rate measured shall be rounded off to 0.5%.
8.4.4 Maximum force total elongation
The maximum force total elongation shall be determined as specified in GB/T 21839. Use a computer to acquire data or use an electronic tensile equipment; […]
8.4.6 Test failure
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.
8.8 Fatigue test
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. Fm – nominal breaking load of steel bar, in N; […]
9 Inspection rules
9.1 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.
2 Shape and dimensions Coil by coil - As specified in 8.2 Cut out from any end of any and every coil As specified in 8.3 Use a measuring tool of division value 1 mm for measurement
5 Tensile strength 1 pc/coil As specified in 8.4.1 strength
3 pcs/ batch As specified in 8.4.2
7 Elongation after fracture 1 pc/ batch As specified in 8.4.3
8 Max force total elongation 3 pcs/ batch As specified in 8.4.4
9 Bending properties 3 pcs/ batch As specified in 8.5 and 8.6 Not less than 1 pc for each production line each month As specified in 8.7
11 Impact properties 1 pc/batch As specified in 8.9 NOTE 1: Whenever changing the designations and specifications of raw material, carry out relaxation test.
NOTE 2: For straight strip steel bars, use the coil number of wire rods cut off as the basis and follow the sampling rules for coils.
9.4 Re-inspection and decision criteria
The re-inspection and decision criteria for steel bars shall be as specified in GB/T 2101- 2008 or GB/T 2103-2008.
10 Packaging, marking and quality certification
10.1 Packaging
10.1.2 The packaging for steel bar straight strips is normally type 1 packaging in GB/T 2101-2008; other packaging types can also be used, as agreed on by the purchaser and the supplier and stated in the contract.
10.3 Quality certification
Each contract batch shall be accompanied by a quality certificate, indicating supplier name, address and trademark, specification, designation, purchaser name, contract number, weight, reference standard, number, manufacturing date, production license mark and stamp of the quality inspection department.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
Referenced standards
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