GB 1499.2-2024 PDF in English
GB 1499.2-2024 (GB1499.2-2024) 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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Standards related to (historical): GB 1499.2-2024
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GB 1499.2-2024: PDF in English GB 1499.2-2024
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
Steel for the reinforcement of concrete - Part 2.Hot rolled
ribbed bars
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
GB/T 20123, Steel and iron -- Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20124, Steel and iron -- Determination of nitrogen content -- Thermal
conductimetric method after fusion in a current of inert gas
GB/T 20125, Low-alloy steel -- Determination of multi-element contents --
Inductively coupled plasma atomic emission spectrometric method
GB/T 28900, Test methods of steel for reinforcement of concrete
JGJ 18, Specification for welding and acceptance of reinforcing steel bars
JGJ 107, Technical specification for mechanical splicing of steel reinforcing bars
YB/T 081, Rule for rounding off of numerical values and judgement of testing values
for technical standards of metallurgy
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 hot rolled bars
Steel bars delivered in hot-rolled condition.
3.2 hot rolled bars of fine grains
Fine grained steel bars formed through controlled rolling and controlled cooling
processes during hot rolling.
3.3 ribbed bars
Steel bars for concrete structures of which the cross-section is usually circular and the
surface is ribbed.
3.4 longitudinal rib
A uniform continuous rib parallel to the axis of the steel bar.
3.5 transverse rib
Other ribs that are not parallel to the axis of the steel bar.
3.6 crescent ribbed bars
A steel that that the longitudinal section of the transverse rib is crescent shaped and does
not intersect with the longitudinal rib.
3.7 nominal diameter
The diameter of a circle equal to the nominal cross-sectional area of the steel bar.
3.8 specific projected rib area
The ratio of the projected area of the transverse rib on the plane perpendicular to the
axis of the steel bar to the product of the nominal circumference of the steel bar and the
spacing between the transverse ribs.
3.9 rib height
The measured distance from the highest point of the rib to the surface of the core
perpendicular to the axis of the steel bar.
3.10 rib spacing
The distance between the centers of two adjacent transverse ribs measured parallel to
the axis of the steel bar.
3.11 characteristic value
The percentile value corresponding to a specified probability in an infinite number of
tests.
3.12 core
The cross-section of the steel bar does not include the transverse ribs and longitudinal
ribs.
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.
less than 45°. When the angle β is not greater than 70°, the direction of the
transverse ribs on the opposite sides of the steel bar shall be opposite.
b) The nominal spacing between transverse ribs shall not exceed 70% of the nominal
diameter of the steel bar.
c) The angle α between the side of the transverse rib and the surface of the steel bar
shall not be less than 45°.
d) The total gap between the ends of the transverse ribs on adjacent sides of the steel
bar (including the width of the longitudinal ribs) shall not exceed 20% of the
nominal circumference of the steel bar.
e) When the nominal diameter of the steel bar is not greater than 12 mm, the relative
rib area is not less than 0.055.When the nominal diameter is 14 mm and 16 mm,
the relative rib area is not less than 0.060.When the nominal diameter is greater
than 16 mm, the relative rib area shall not be less than 0.065.The calculation of
the relative rib area of steel bars is shown in Annex A.
5.3.2 Steel bars are divided into two types. those with longitudinal ribs and those
without longitudinal ribs. Crescent ribbed steel bars with longitudinal ribs are as shown
in Figure 1.The size and allowable deviation of steel bars shall comply with the
provisions of Table 3.The inner diameter size of crescent ribbed steel bars without
longitudinal ribs can be adjusted according to the requirements of both the supplier and
the purchaser based on Table 3.
5.3.3 When the allowable deviation between the actual weight and theoretical weight
of the steel bars meets the requirements in Table 4, the deviation of the inner diameter
of the steel bars and the height of the longitudinal ribs are not considered as delivery
conditions.
m - theoretical unit weight, in grams per millimeter (g/mm).
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
8.3.2.1 Steel bars shall be inspected and accepted in batches. Each batch is composed
of steel bars of the same designation, furnace number, and specification.
8.3.2.2 It is allowed to form a mixed batch of different furnace numbers with the same
designation, smelting method, and pouring method for rolling. But the difference in
carbon content between the melting analysis of each furnace number shall not exceed
0.02%. The difference in manganese content shall not exceed 0.15%. The weight of the
mixed batch shall not exceed 60 t. Rolling finished products shall not be grouped into
mixed batches.
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.
Annex C
(normative)
Rules for characteristic value inspection
C.1 Test batching and sampling quantity
C.1.1 Test batching
For the purpose of testing, delivery shall be divided into test batches. The batch rules
shall comply with the provisions of 8.3.2.
C.1.2 Sampling quantity per batch
C.1.2.1 Two specimens shall be taken from different steel bars for chemical
composition (finished product analysis).
C.1.2.2 The mechanical properties shall be tested by taking 15 specimens from different
steel bars (if 60 specimens are applicable, see C.2.1).
C.2 Evaluation of test results
C.2.1 Parameter verification
To verify the specified performance, such as characteristic parameters ReL, Rm, Agt, or
A, the following parameters shall be determined.
a) All individual values Xi (n=15) of 15 specimens;
b) Average value m15 (n=15);
c) Standard deviation S15 (n=15).
If all performance meets the conditions given in formula (C.1), then the test batch meets
the requirements.
Where,
fk - required characteristic value;
2.33 - the value of the acceptance coefficient k when n=15.90% confidence level (1-
α=0.90) and the failure rate is 5% (P=0.95).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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