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Standard ID | GB 1499.2-2024 (GB1499.2-2024) | Description (Translated English) | Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars | Sector / Industry | National Standard | Classification of Chinese Standard | H44 | Classification of International Standard | 77.140.15 | Word Count Estimation | 20,276 | Date of Issue | 2024-06-25 | Date of Implementation | 2024-09-25 | Administrative Organization | Ministry of Industry and Information Technology of the People's Republic of China | Proposing organization | Ministry of Industry and Information Technology of the People's Republic of China | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Standard ID | GB/T 1499.2-2018 (GB/T1499.2-2018) | Description (Translated English) | Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | H44 | Classification of International Standard | 77.140.60 | Word Count Estimation | 26,261 | Date of Issue | 2018-02-06 | Date of Implementation | 2018-11-01 | Drafting Organization | China Metallurgical Building Research Institute Co., Ltd., Metallurgical Industry Information Standards Institute, Shougang Changzhi Steel Co., Ltd., Shandong Iron and Steel Co., Ltd. Laiwu Branch, Jiangsu Shagang Group Co., Ltd., Wuhan Iron and Steel Group Kunming Iron and Steel Co., Ltd., Fujian Sansteel ( (Group) Co., Ltd., Jigang Group Co., Ltd., Jiangsu Yonggang Group Co., Ltd., Hebei Jinxi Iron & Steel Group Co., Ltd., Hebei Jingye Iron & Steel Co., Ltd., Zhongtian Iron & Steel Group Co., Ltd., Jiangsu Shente Iron & Steel Co., Ltd., Fushun New Steel Limited liability company, Tangshan Donghua Iron and Steel Enterprise Group Co., Ltd., Jiangsu Xinxin Iron & Steel Group Co., Ltd., and Iron and Steel Research Institute | Administrative Organization | National Steel Standardization Technical Committee (SAC/TC 183) | Proposing organization | China Iron and Steel Association | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration | Standard ID | GB 1499.2-2007 (GB1499.2-2007) | Description (Translated English) | [GB/T 1499.2-2007] Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars [including MODIFICATION 1] | Sector / Industry | National Standard | Classification of Chinese Standard | H44 | Classification of International Standard | 77.140.60 | Word Count Estimation | 18,176 | Date of Issue | 2007-08-14 | Date of Implementation | 2008-03-01 | Older Standard (superseded by this standard) | GB 1499-1998 | Quoted Standard | GB/T 222; GB/T 223.5; GB/T 223.11; GB/T 223.12; GB/T 223.14; GB/T 223.17; GB/T 223.19; GB/T 223.23; GB/T 223.26; GB/T 223.27; GB/T 223.37; GB/T 223.40; GB/T 223.59; GB/T 223.63; GB/T 223.68; GB/T 223.69; GB/T 228; GB/T 232; GB/T 2101; GB/T 4336; GB/T 6394; GB/T 17505; GB/T 20066; YB/T 081; YB/T 5126 | Adopted Standard | ISO 6935-2-1991, NEQ | Drafting Organization | China Metallurgical Construction Group Research Institute | Administrative Organization | National Steel Standardization Technical Committee | Regulation (derived from) | Announcement of Newly Approved National Standards No. 8, 2007 (No. 108 overall) | Proposing organization | China Iron and Steel Association | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This Chinese standard applies to reinforced concrete rolled ribbed steel definition, classification, grade, order contents, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certification. This standard applies to reinforced concrete with ordinary hot-rolled ribbed steel bars and fine grain rolled ribbed steel bars. This standard does not apply to finished steel re- rolling into the regeneration of steel and heat treated steel. |
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).
......
GB/T 1499.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 1499.2-2007
Steel for the reinforcement of concrete -
Part 2. Hot rolled ribbed bars
(ISO 6935-2.2015, Steel for the reinforcement of concrete -
Part 2. Ribbed bars, NEQ)
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. NOVEMBER 01, 2018
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 Contents
Foreword ... 4
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 9
4 Classification, grade ... 11
5 Order content ... 11
6 Dimension, shape, weight and tolerance ... 12
6.1 Nominal diameter range ... 12
6.2 Nominal cross-sectional area and theoretical weight ... 12
6.3 Surface shape and dimension tolerances of bars ... 12
6.4 Length and tolerance ... 16
6.5 Curvature and end ... 16
6.6 Weight and tolerance ... 16
7 Technical requirements ... 17
7.1 Smelting method ... 17
7.2 Grades and chemical composition ... 17
7.3 Delivery type ... 18
7.4 Mechanical properties ... 18
7.5 Process performance ... 19
7.6 Fatigue performance ... 19
7.7 Connection performance ... 19
7.8 Grain size ... 20
7.9 Metallographic structure ... 20
7.10 Surface quality ... 20
8 Test methods ... 20
8.1 Inspection items ... 20
8.2 Tensile, bending, reverse bending test ... 22
8.3 Dimension measurement ... 22
8.4 Measurement of weight deviation ... 23
8.5 Macroscopic metallography, cross-section Vickers hardness,
microstructure inspection ... 23
8.6 Rounding off of numerical values ... 23
9 Inspection rules ... 23
9.1 Inspection classification ... 23
9.2 Characteristic value inspection ... 23
9.3 Delivery inspection ... 24
10 Packaging, marking, and quality certificate ... 24
Annex A (informative) Calculation formula for specific projected rib area of bars
... 26
Annex B (normative) Macroscopic metallography, cross-section Vickers
hardness, microstructure of bars and inspection methods ... 27
Annex C (normative) Characteristic value inspection rules ... 30
Foreword
GB/T 1499 “Steel for the reinforcement of concrete” consists of three parts.
- Part 1. Hot rolled plain bars;
- Part 2. Hot rolled ribbed bars;
- Part 3. Welded fabric.
This Part is Part 2 of GB/T 1499.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 1499.2-2007 “Steel for the reinforcement of concrete -
Part 2. Hot rolled bars”.
Compared with GB/T 1499.2-2007, the main changes of this Part are as follows.
- ADD the smelting method;
- CANCEL the 335 MPa grade bar;
- ADD the 600 MPa grade bar;
- ADD the bars of which the grade is with E;
- Appropriately TIGHTEN the length tolerance and curvature;
- Appropriately TIGHTEN the weight tolerance, making it clear that the weight
tolerance does not allow reinspection;
- REQUIRE the reverse bending test of bars of which the grade is with E AS
a routine inspection item;
- ADD the specifications for the fatigue test method for bars;
- ADD the specifications for the inspection of metallographic structure;
- ADD macroscopic metallography, cross-section Vickers hardness,
microstructure, and their inspection methods;
- ADD the measurement method for the gap at the end of transverse ribs;
- The surface marking is changed from the “Registered factory name (or
trademark)” TO “The serial number of the production license of hot rolled
bar products obtained by the enterprise (the last 3 digits)”; DELETE “For
bars with a nominal diameter not greater than 10 mm, the marking may be
Steel for the reinforcement of concrete
- Part 2. Hot rolled ribbed bars
1 Scope
This Part of GB/T 1499 specifies the terms and definitions, classification, grade,
order content, dimension, shape, weight and tolerance, technical requirements,
test methods, inspection rules, packaging, marking and quality certificate of hot
rolled ribbed bars for the reinforcement of concrete (hereinafter referred to as
bars).
This Part applies to hot rolled ribbed bars and hot rolled ribbed bars of fine
grains for the reinforcement of concrete.
This Part does not apply to re-rolled bars and residual heat-treated bars rolled
from finished steel.
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-
benzoy-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium 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 (routine method)
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
YB/T 081 Rule for rounding off of numerical values and judgement of testing
values for technical standards of metallurgy
JGJ 18 Specification for welding and acceptance of reinforcing steel bars
JGJ 107 Technical specification for mechanical splicing of steel reinforcing
bars
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
hot rolled bars
Bars delivered in hot rolled condition.
3.2
hot rolled bars of fine grains
In the hot rolling process, bars of fine grains formed by controlled rolling and
controlled cooling processes, having a grain size of level 9 or finer.
3.3
ribbed bars
Steel for concrete structures, of which the cross-section is usually round and
the surface is with ribs.
3.4
longitudinal rib
θ - longitudinal rib angle;
a - longitudinal rib top width;
l - transverse rib spacing;
b - transverse rib top width;
fi - transverse rib end gap.
Figure 1 -- Surface and cross-sectional
shape of crescent ribbed bar (with longitudinal ribs)
6.4 Length and tolerance
6.4.1 Length
6.4.1.1 Bars are usually delivered in cut length. The specific delivery length
shall be specified in the contract.
6.4.1.2 Bars may be delivered in coils. Each coil shall consist of a bar. It is
allowed that there are 5 % of the number of coils (two coils when there are less
than two coils) consisting of two bars in each batch. The coil weight is agreed
upon between supply and demand parties.
6.4.2 Length tolerance
The tolerance of the length of the bars delivered in cut length is 50 0 mm.
6.5 Curvature and end
The curvature of straight bars shall not affect normal use. The curvature per
meter is less than 4 mm. The total curvature is not more than 0.4 % of the total
length of the bar.
The end of bars shall be cut straight, and local deformation shall not affect use.
6.6 Weight and tolerance
6.6.1 Bars may be delivered in theoretical weight, or in actual weight. When
delivered in theoretical weight, the theoretical weight is the length of the bar
multiplied by the theoretical weight per meter of the bar in Table 2.
6.6.2 The tolerance of the actual weight and the theoretical weight of bars shall
comply with the specifications of Table 4.
and joints of bars shall comply with the specifications of relevant standards such
as JGJ 18, JGJ 107.
7.7.2 The welding process of HRBF500 and HRBF500E bars shall be
determined by tests.
7.7.3 It is recommended to connect HRB600 bars using mechanical connection.
7.8 Grain size
The actual grain size of hot rolled bars of fine grains is Level 9 or finer. If this is
guaranteed by the supply party, the grain size inspection may be exempted.
7.9 Metallographic structure
The metallurgical structure of bars shall be mainly ferrite plus pearlite, and
tempered martensite shall not appear on the core. The macroscopic metallurgy,
cross-section Vickers hardness and microstructure of bars shall comply with
the specifications of Annex B. If they are guaranteed by the supply party, the
inspection may be exempted.
7.10 Surface quality
7.10.1 Bars shall be free from harmful surface defects.
7.10.2 When the weight, dimension, cross-sectional area and mechanical
properties of wire-brushed specimens are not lower than the requirements of
Clauses 6 and 7, the scales, surface irregularities or oxide scales are not
regarded as the reason for rejection.
7.10.3 When specimens with surface defects other than those specified in
7.10.2 do not meet the mechanical properties or process performance
requirements, the defects are considered to be harmful.
8 Test methods
8.1 Inspection items
8.1.1 The inspection items, sampling methods and test methods for each batch
of bars shall comply with the specifications of Table 8.
and demand parties;
c) Third-party product certification and arbitration inspection.
9.2.2 The characteristic value inspection shall be conducted according to the
rules of Annex C.
9.3 Delivery inspection
9.3.1 Applicable situation
The delivery inspection applies to the inspection of bar acceptance batches.
9.3.2 Batching rules
9.3.2.1 Bars shall be inspected and accepted in batches. Each batch shall
consist of bars of the same grade, the same furnace number and the same
specification. The weight of each batch is usually not more than 60 t. For the
part over 60 t, for each additional 40 t (or the remainder for those less than 40
t), add a tensile test specimen and a bend test specimen.
9.3.2.2 It is permissible to form mixed batches with bars of the same batch
number, the same smelting method, the same casting method and different
furnace numbers. However, the difference between the carbon content of each
furnace number is not more than 0.02 %, and the difference between the
manganese content is not more than 0.15 %. The weight of the mixed batch is
not more than 60 t.
9.3.3 Inspection items and sampling quantity
The inspection items and sampling quantity of bars shall comply with the
specifications Table 8 and 9.3.2.1.
9.3.4 Inspection results
The inspection results of each inspection item for bars (including bars after
coiling and straightening) shall comply with the relevant specifications of
Clauses 6 and 7.
9.3.5 Reinspection and determination
The reinspection and determination of bars shall comply with the specifications
of GB/T 17505. The weight deviation items of bars do not allow reinspection.
10 Packaging, marking, and quality certificate
10.1 The surface marking of bars shall comply with the following specifications.
Annex C
(normative)
Characteristic value inspection rules
C.1 Test batching and sampling quantity
C.1.1 Test batching
For tests, delivery shall be subdivided into test batches. The batching rules shall
comply with the specifications of 9.3.2.
C.1.2 Sampling quantity per batch
C.1.2.1 For chemical composition (finished product analysis), two specimens
shall be taken from different piece of bars.
C.1.2.2 For tests of mechanical properties, 15 specimens shall be taken from
different piece of bars (if 60 specimens are applicable, see C.2.1).
C.2 Evaluation of test results
C.2.1 Parametric inspection
To inspect the specified properties, such as the characteristic parameters ReL,
Rm, Agt, or A, the following parameters shall be determined.
a) all single values Xi (n = 15) for 15 specimens;
b) the average value m15 (n = 15);
c) the standard deviation S15 (n = 15).
If all the properties meet the condition given by formula (C.1), the test batch
meets the requirements.
where.
fk - the required characteristic value;
2.33 - the value of acceptance coefficient k when n = 15, 90 % confidence
level (1 - a = 0.90) and failure rate 5 % (P = 0.95).
......
GB 1499.2-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB 1449-1998
Steel for the Reinforcement of Concrete –
Part 2. Hot Rolled Ribbed Bars
(ISO 6935-2.1991, Steel for the Reinforcement of Concrete –
Part 2. Ribbed Bars, NEQ)
ISSUED ON. AUGUST 14, 2008
IMPLEMENTED ON. MARCH 01, 2008
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 Contents
Foreword ... 3
1. Scope ... 5
2. Normative references ... 5
3. Definitions ... 7
4. Types and designations ... 9
5. Order content ... 9
6. Dimension, shape weight and tolerance ... 9
6.1 Nominal diameter range and recommend diameter ... 9
6.2 Nominal cross-sectional area and theoretical weight ... 10
6.3 Surface shape and dimension tolerance of ribbed bar ... 10
6.4 Length and length tolerance ... 13
6.5 Bend degree and end ... 13
6.6 Weight and weight tolerance ... 13
7. Technical requirements ... 14
7.1 Designation and chemical composition ... 14
7.2 Delivery way ... 14
7.3 Mechanical property ... 14
7.4 Processing property ... 15
7.5 Fatigue property ... 16
7.6 Welding property ... 16
7.7 Grain size ... 17
7.8 Surface quality ... 17
8. Test Method ... 17
8.1 Inspection items ... 17
8.2 Tensile, bending and reverse bend test ... 18
8.3 Dimension Measurement ... 18
8.4 Measurement of weight tolerance ... 18
9. Inspection Rules ... 19
9.1 Characteristic value inspection ... 19
9.2 Delivery inspection ... 19
10. Packaging, marking and quality certificate ... 20
Annex A (Normative) Measuring Method of Steel Bar under General Maximum Force
Elongation ... 21
Annex B (Normative) Inspection Rules of Characteristic Value ... 23
Annex C (Informative) Calculation Formula of Specific Projected Rib Area of Steel Bar .. 25
No. 1 Modification Sheet to National Standard "Steel for the Reinforcement of
Concrete - Part 2. Hot Rolled Ribbed Bars" (GB 1499.2-2007) ... 26
Foreword
GB 1499 is divided into three parts.
— Part 1. Hot rolled plain bars;
— Part 2. Hot rolled ribbed bars;
— Part 3. Steel bar welting net.
This is Part 2 of GB 1499; it corresponds to the international standard ISO
6935-2.1991 “Steel for the Reinforcement of Concrete - Part 2. Ribbed bars”; it is not
equivalent to ISO 6935-2.1991. This part also makes reference to the revision version
of international standard "ISO/DIS 6935-2 (2005)".
This part replaces GB 1499-1998 “Hot Rolling Ribbed Steel Bars for the
Reinforcement of Concrete”.
The main changes between this part and GB 1499-1998 are as follows.
— The hot rolled bars of fine grains was added in the scope of application;
— Add three designations of hot rolled bars of fine grains, namely HRBF335,
HRBF400 and HRBF500;
— Add three definitions - 3.1 general hot-rolled reinforced bar, 3.2 hot rolled bars of
fine grains and 3.11 characteristic value;
— Add Chapter 5 of purchasing content;
— Add three specifications - 7.5 fatigue property, 7.6 welding performance and 7.7
grain size;
— Amend "surface quality", "weight deviation measuring" and other provisions;
— Amend the designation sign of steel bars; HRB335, HRB400 and HRB500 are
replaced by 3, 4 and 5 respectively; while HRBF335, HRBF400 and HRBF500
are replaced by C3, C4 and C5;
— Delete the original Annex B "reference composition of hot-rolled ribbed bars";
— Add existing Annex B "test rules of the characteristic value";
— Add Annex C "computing formula of relative ribs area of steel bar".
Steel for the Reinforcement of Concrete –
Part 2. Hot Rolled Ribbed Bars
1. Scope
This part specifies the definition, type, designation, purchasing content, dimension,
shape, or weight tolerance, technical specification, testing method, test rules, packing,
sign and certificate of quality of the hot rolled ribbed bars of reinforced concrete.
This part is applicable to the general hot rolled ribbed bars for the reinforcement of
concrete, and hot rolled ribbed bar with ultra-fine grain.
This part is not applicable to the recycling steel bar re-rolled by the rolled-steel final
product, and remained heat treatment ribbed bars
2. Normative references
The provisions in following documents become the provisions of this part of GB 1499,
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this part, however,
parties who reach an agreement based on this Standard are encouraged to study if
the latest versions of these documents are applicable. For undated references, the
latest edition of the referenced document applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Reduced Molybdosilicate Spectrophotometric Method for the
Determination of Acid-soluble Silicon Content
GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Persulfate Oxidation Volumetric Method for the
Determination of Chromium Content
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-benzoy-N-phenylhydroxylamine Extraction Photometric Method
228-2002, eqv ISO 6892.1998(E))
GB/T 232 Metallic Materials - Bend Test (GB/T 232-1999, eqv ISO
7438.1985(E))
GB/T 2101 General Requirements of Acceptance, Packaging, Marking, and
Certification for Section Steel
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-alloy Steel (routine
method)
GB/T 6394 Metal Methods for Estimating the Average Grain Size
GB/T 17505 Steel and Steel Products General Technical Delivery Requirements
(GB/T 17505-1998, eqv ISO 404.1992)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition (GB/T 20066-2006/ISO
14284.1998, IDT)
YB/T 081 Rule for Rounding off of Numerical Values and Judgment of Testing
Values for Technical Standards of Metallurgy
YB/T 5126 Steel Bars for Reinforcement of Concrete-Bend and Rebend Tests
(YB/T 5126-2003/ISO 10065 1990, MOD)
3. Definitions
The following definitions are applicable to this part.
3.1 Hot rolled bars
The steel bar delivered under hot rolling condition; its metallurgical structure is mainly
composed of ferrite and pearlite, no other textures (for instance, the β-Martensite
appeared on the base circle) [Translator Note. Text in red - “GB 1499.2-2007 No. 1
Modification Sheet, June 16, 2009” ] are permitted to exist, which may influence the
usability of steel bar.
3.2 Hot rolled bars of fine grains
The grain refining steel bar formed by applying control rolling and cooling
techn...
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