GB 1499.2-2024 PDF English
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| GB 1499.2-2024 | English | 220 |
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Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars
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| GB/T 1499.2-2018 | English | 135 |
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Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars
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| GB 1499.2-2007 | English | 85 |
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[GB/T 1499.2-2007] Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars [including MODIFICATION 1]
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GB 1499.2-2024: Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars---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/GB1499.2-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.15
CCS H 44
Replacing GB/T 1499.2-2018
Steel for the reinforcement of concrete - Part 2.Hot rolled
ribbed bars
Issued on: JUNE 25, 2024
Implemented on: SEPTEMBER 25, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 8
4 Classification, designation... 9
5 Size, shape, weight, and allowable deviation... 10
6 Smelting and performance... 14
7 Test methods... 18
8 Inspection rules... 21
9 Packaging, marks, and quality certification... 22
Annex A (informative) Formula for calculating the relative rib area of steel bars... 24
Annex B (normative) Macroscopic metallography, section Vickers hardness,
microstructure and inspection methods of steel bars... 25
Annex C (normative) Rules for characteristic value inspection... 28
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document is Part 2 of GB 1499 "Steel for the reinforcement of concrete". The
following parts of GB 1499 have been released.
- Part 1.Hot rolled plain bars;
- Part 2.Hot rolled ribbed bars;
- Part 3.Welded fabric.
This document replaces GB/T 1499.2-2018 "Steel for the reinforcement of concrete --
Part 2.Hot rolled ribbed bars". Compared with GB/T 1499.2-2018, in addition to
structural adjustments and editing changes, the main technical changes are as follows.
- Change the allowable weight deviation (see Table 4 of this Edition; Table 4 of
Edition 2018);
- Change the requirements for fatigue performance (see 6.5 of this Edition; 7.6 of
Edition 2018);
- Add the sampling requirements for size and surface quality testing (see Table 8 of
this Edition);
- Change the accuracy of measuring total weight for weight deviation (see 7.4.1 of
this Edition; 8.4.1 of Edition 2018);
- Change the requirements for mixed batches (see 8.3.2 of this Edition; 9.3.2 of
Edition 2018);
- Change the inspection items and sampling quantity (see 8.3.3 of this Edition; 9.3.2
of Edition 2018);
- Revise the re inspection regulations for weight deviation items (see 8.3.5 of this
Edition; 9.3.5 of Edition 2018);
- Change the regulations on packaging, marks, and quality certification (see Chapter
9 of this Edition; Chapter 10 of Edition 2018).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of the Ministry of
Industry and Information Technology of the People's Republic of China.
Versions of standard substituted by this document are.
- It was released in 1979 as GB 1499-1979.The first revision was made in 1984.The
second revision was in 1991.The third revision was in 1998;
- The fourth revision in 2007 was GB 1499.2-2007;
- The fifth revision in 2018 was GB/T 1499.2-2018;
- This is the sixth revision.
1 Scope
This document specifies the classification, designation, size, shape, weight and
allowable deviation, smelting and performance, test methods, inspection rules,
packaging, marks and quality certificates for the hot rolled ribbed bars the
reinforcement of concrete (hereinafter referred to as steel bars).
This document is applicable to hot rolled bars and hot rolled bars of fine grains for the
reinforcement of concrete.
This document is not applicable to recycled steel bars and waste heat treated steel bars
that are re rolled from finished steel products.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 222, Permissible tolerances for chemical composition of steel products
GB/T 223.5, Steel and iron -- Determination of acid-soluble silicon and total silicon
content -- Reduced molybdosilicate spectrophotometric method
GB/T 223.11, Iron, steel and alloy -- Determination of chromium content -- Visual
titration or potentiometric titration method
GB/T 223.12, Methods for chemical analysis of iron, steel and alloy. The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium content
GB/T 223.14, Methods for chemical analysis of iron, steel and alloy. The N-benzoyl-
N-phenylhydroxylamine extraction photometric method for the determination of
vanadium content
GB/T 223.17, Methods for chemical analysis of iron, steel and alloy -- The
diantipyrylmethane photometric method for the determination of titanium content
GB/T 223.19, Methods for chemical analysis of iron, steel and alloy. The
neocuproine-chloroform extraction photometric method for the determination of
copper content
GB/T 223.23, Iron, steel and alloy -- Determination of nickel content -- The
dimethylglyoxime spectrophotometric method
GB/T 223.26, Iron, steel and alloy -- Determination of molybdenum content -- The
thiocyanate spectrophotometric method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4 Classification, designation
4.1 Steel bars are classified into 400, 500, and 600 grades based on their yield strength
characteristic values.
4.2 The composition and meaning of steel bar designations are shown in Table 1.
Table 1 -- Composition and meaning of steel bar designations
5 Size, shape, weight, and allowable deviation
5.1 Nominal diameter range
The nominal diameter range of steel bars is 6 mm~50 mm.
5.2 Nominal cross-sectional area and theoretical unit weight
The nominal cross-sectional area and theoretical unit weight of steel bars shall comply
with the provisions of Table 2.
Table 2 -- Nominal cross-sectional area and theoretical unit weight of steel bars
5.3 Allowable deviations in shapes and dimensions
5.4 Delivery type and allowable deviation
5.4.1 Steel bars shall be delivered in fixed length according to straight bars. The delivery
length shall be specified. The allowable deviation for length is.
5.4.2 Steel bars with a diameter not exceeding 16 mm are allowed to be delivered in
coils. Cut the head and tail when delivering. Each coil shall consist of one steel bar.
Each batch is allowed to have 5% of the number of coils (two coils are allowed if there
are less than two coils) composed of two steel bars. The weight of the inventory shall
be determined through negotiation between the supplier and the purchaser.
5.5 Bending degree and end
5.6 Weight and allowable deviation
5.6.1 Steel bars shall be delivered by weight. There are two delivery methods. in actual
weight and theoretical weight. The theoretical weight of steel bars is calculated by
multiplying the length of the steel bars by the theoretical weight per meter of steel bars
in Table 2.
5.6.2 The allowable deviation between the actual weight and theoretical weight of steel
bars shall comply with the provisions of Table 4.
6 Smelting and performance
6.1 Smelting method
Steel shall be smelted using a converter or electric arc furnace. HRB500E, HRBF500E,
Nominal diameter
d/mm Deviation between actual weight and theoretical weight η/%
and HRB600 shall undergo external refining.
6.2 Chemical composition
6.3 Mechanical properties
6.3.1 The mechanical property characteristic values of steel bars, such as lower yield
strength ReL, tensile strength Rm, elongation at break A, and maximum total elongation
at break Agt, shall comply with the provisions of Table 6.For the mechanical
performance characteristic values listed in Table 6, R°eL/ReL is the maximum
guaranteed value and others are the minimum guaranteed values.
6.3.2 The elongation at break A of various designations of steel bars with nominal
diameters ranging from 28 mm~40 mm is allowed to be reduced by 1%. The elongation
at break A of each designation of steel bars with a nominal diameter greater than 40 mm
is allowed to be reduced by 2%.
6.4 Process performance
6.5 Fatigue performance
When applied to concrete structures or components that bear dynamic cyclic effects
such as highway bridges and culverts, railway bridges and culverts, and underground
structures of urban rail transit, corresponding fatigue performance test reports of
corresponding designations and specifications shall be provided. Fatigue performance
testing shall be conducted in accordance with GB/T 28900, with 5 steel bars cut from
different pieces (coils).
6.6 Connection performance
6.6.1 The welding and mechanical connection process of steel bars, as well as the
quality inspection and acceptance of joints, shall comply with the provisions of JGJ 18
and JGJ 107.
6.6.2 The welding process for HRBF500 and HRBF500E steel bars shall be determined
through testing.
6.6.3 HRB600 steel bars are mechanically connected. Welding is allowed for
connection.
6.7 Grain size
6.8 Microstructure
The metallographic structure of steel bars shall mainly consist of ferrite and pearlite.
There shall be no tempered martensite structure on the core. The macroscopic
metallography, cross-sectional Vickers hardness, and microstructure of steel bars shall
comply with the provisions of Annex B. After consultation between the supplier and
the purchaser, it is allowed not to conduct metallographic examination.
6.9 Surface quality
7 Test methods
7.1 Inspection items
7.2 Tensile, bending, and reverse bending tests
7.2.1 Tensile, bending, and reverse bending test specimens shall not be machined.
7.2.2 The cross-sectional area used to calculate the strength of steel bars is the nominal
cross-sectional area listed in Table 2.
7.2.3 Reverse bending test. First bend the specimen in the forward direction by 90°, and
keep it at a temperature of 100℃± 10℃ for no less than 30 min after the forward
bending. After natural cooling, bend it in the opposite direction by 20°. Both bending
angles shall be measured while maintaining the load. Exit-factory inspection allows
direct reverse bending at room temperature. Arbitration inspection shall be carried out
by reverse bending after the time limit.
7.3 Size measurement
7.3.1 The measurement of the inner diameter of steel bars shall be accurate to 0.1 mm.
7.3.2 The measurement of the height of longitudinal and transverse ribs of steel bars
adopts the method of measuring the average height of the center of the transverse ribs
on both sides of the same section. That is, measure the maximum outer diameter of the
steel bar, subtract the inner diameter at that location, and obtain half of the value as the
rib height at that location, which shall be accurate to 0.1 mm.
7.3.3 The spacing between the transverse ribs of the steel bars is measured using the
method of measuring the average rib spacing. That is, measure the center distance
between the 1st and 11th transverse ribs on the same side of the steel bar. The value
divided by 10 is the spacing between the transverse ribs, which shall be accurate to 0.1
mm.
7.3.4 Measure the chord length between the two ends of adjacent transverse ribs
projected perpendicular to the axis plane of the steel bar by measuring the gap between
the ends of the transverse ribs of the steel bar. The schematic diagram of measuring the
gap at the end of the steel bar transverse rib is shown in Figure 2.
Keys.
7.4 Measurement of weight deviation
7.4.1 When measuring the weight deviation of steel bars, specimens shall be taken from
different steel bars. The quantity is 5 pieces. The length of each specimen shall not be
less than 500 mm. The length shall be measured one by one, with an accuracy of 1 mm.
When measuring the total weight of the specimen, it shall be accurate to 1 g.
7.4.2 The deviation (%) between the actual weight and theoretical weight of the steel
bar shall be calculated according to formula (2).
7.5 Macroscopic metallography, cross-sectional Vickers hardness, microstructure
inspection
The inspection of macroscopic metallography, cross-sectional Vickers hardness, and
microstructure shall be carried out in accordance with the provisions of Annex B.
Microstructure shall be used as the basis for arbitration.
7.6 Numerical rounding and judgment
The rounding and judgment of the test results shall comply with the provisions of YB/T
081.
8 Inspection rules
8.1 Inspection classification
The inspection of steel bars is divided into characteristic value inspection and delivery
inspection.
8.2 Characteristic value inspection
8.2.1 Characteristic value inspection is applicable to the following situations.
a) Supplier's inspection of product quality control;
b) Inspection required by the purchaser and after mutual agreement between the
supplier and the purchaser;
c) Third party product certification and arbitration inspection.
8.2.2 The characteristic value inspection shall be conducted in accordance with the
provisions of Annex C.
8.3 Delivery inspection
8.3.1 Applicable situation
Delivery inspection is applicable to the inspection of steel bar acceptance batches.
8.3.2 Batching rules
8.3.3 Inspection items and sampling quantity
When the weight of each batch is not more than 60 t, samples shall be taken and
inspected according to the requirements in Table 8.When the weight of each batch is
greater than 60 t, for every additional 40 t (or the remainder of less than 40 t), 1 tensile
test specimen and 1 bending test specimen shall be added. An additional reverse
bending test specimen shall be added for steel bars of designations with "E".
8.3.4 Inspection results
The inspection results of each inspection item of steel bars (including steel bars
straightened by coiling) shall comply with the relevant provisions of Chapter 5 and
Chapter 6.
8.3.5 Re-inspection and judgement
The re-inspection and judgment of steel bars shall comply with the provisions of GB/T
17505.The weight deviation of steel bars shall not be resampled for re-inspection.
9 Packaging, marks, and quality certification
9.1 The surface marks of steel bars shall comply with the following regulations.
a) Steel bars shall be marked with the grade mark, production enterprise serial
number (the first 2 digits of the administrative division code and the last 3 digits
of the license specified in GB/T 2260), and nominal diameter in millimeters on
their surface. Allow registered factory names or trademarks to replace the first
two digits of the administrative division code.
b) The steel bar designation mark is represented by Arabic numerals or Arabic
numerals plus English letters. HRB400, HRB500, and HRB600 are represented
by 4, 5, and 6, respectively. HRBF400 and HRBF500 are respectively represented
by C4 and C5.HRB400E and HRB500E are respectively represented as 4E and
5E. HRBF400E and HRBF500E are respectively represented as C4E and C5E.
The factory name is represented by the Chinese Pinyin prefix. The nominal
diameter in millimeters is represented by Arabic numerals.
c) The mark shall be clear and concise. The size of the mark shall be appropriately
specified by the supplier according to the diameter of the steel bars. The
transverse ribs intersecting with the logo can be removed.
9.2 Barcodes and QR codes containing product information are allowed to be affixed
to the packaging, labels, and quality certificates of steel bars.
9.3 In addition to the above regulations, the packaging, marks, and quality certificate
of steel bars shall comply with the relevant provisions of GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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