GB/T 33953-2017 PDF in English
GB/T 33953-2017 (GB/T33953-2017, GBT 33953-2017, GBT33953-2017)
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Corrosion resistance bars for the reinforcement of concrete
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GB/T 33953-2017: PDF in English (GBT 33953-2017) GB/T 33953-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Corrosion resistance bars for the
reinforcement of concrete
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: APRIL 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions ... 7
4 Classification and designation ... 7
5 Order content ... 7
6 Dimensions, shape, weight and allowable deviation ... 8
7 Technical requirements ... 8
8 Test methods ... 11
9 Inspection rules ... 14
10 Packaging, marking, and certification ... 15
Corrosion resistance bars for the
reinforcement of concrete
1 Scope
This Standard specifies the definitions, classification, designation, order content,
dimensions, shape, weight and allowable deviation, technical requirements,
test methods, inspection rules, packaging, marking, and certification, etc. of
corrosion resistance bars for the reinforcement of concrete.
This Standard applies to hot rolled or controlled-rolling controlled-cooling
corrosion resistance ribbed bars for the reinforcement of concrete which meet
the requirements of durability design (hereinafter referred to as bars).
This Standard does not apply to stainless-steel bars.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
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 223.17 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
GB/T 223.27 Methods for chemical analysis of iron, steel and alloy - The
thiocyanate-butyl acetate extraction spectrophotometric method for the
determination of molybdenum content
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Indophenol Blue Photometric Method for the Determination of Nitrogen
Content after Distillation Separation
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.49 Methods for chemical analysis of iron, steel and alloy -
Extraction separation-chlorophosphonazo mA spectrophotometric method
for the determination of the total rare earth content
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content -
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared
absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared
absorption method after combustion in an induction furnace
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 232 Metallic materials - Bend test
GB/T 1499.2 Steel for the reinforcement of concrete - Part 2: Hot rolled
ribbed bars
GB/T 2101 General requirement of acceptance, packaging, marking and
certification for section steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine
method)
GB/T 17505 Steel and steel products - General technical delivery
requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
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
YB/T 081 Rule for rounding off of numerical values and judgement of testing
values for technical standards of metallurgy
YB/T 4367 Steel bars corrosion test method in chloride environment
YB/T 4368 Steel bars corrosion test method in industrial atmosphere
environment
YB/T 4369 Test method for the corrosion of steel bar embedded in concrete
in chloride environment
YB/T 5126 Steel bars for reinforcement of concrete - Bend and rebend tests
JGJ 18 Specification for welding and acceptance of reinforcing steel bars
JGJ/T 27 Standard for test methods of welded joint of reinforcing steel bars
JGJ 107 Technical specification for mechanical splicing of steel reinforcing
bars
may be appropriately relaxed.
7.1.4 The permissible tolerances for chemical composition of bar products shall
comply with the provisions of GB/T 222.
7.2 Smelting method
The steel is smelted by a converter or an electric furnace.
7.3 Delivery state and delivery type
7.3.1 The bars are delivered in hot rolled or controlled-rolling controlled-cooling
state.
7.3.2 The bars are usually delivered in straight bars. Bars with a diameter of no
more than 16 mm may also be delivered in coils.
7.4 Mechanical properties
7.4.1 The eigenvalues of mechanical properties of the bars such as the lower
yield strength ReL, tensile strength Rm, percentage elongation after fracture A,
and total elongation Agt under maximum force shall be in accordance with Table
3. The mechanical property eigenvalues listed in Table 3 may be used as
guarantee values of delivery inspection.
7.4.2 The percentage elongation after fracture A of each designation of bars
with a nominal diameter of 28 mm~40 mm may be reduced by 1% (absolute
value). The percentage elongation after fracture A of each designation of bars
with a nominal diameter of more than 40 mm may be reduced by 2% (absolute
value).
7.4.3 For bars without significant yield, the lower yield strength eigenvalue ReL
shall be the specified plastic elongation strength Rp0.2.
7.5.2.3 The bend test may be replaced by a rebend test.
7.5.2.4 The bending indenter diameter of rebend test, compared with the bend
test, is increased by one nominal diameter of the bar.
7.6 Other requirements
Fatigue property, grain size, and surface quality shall comply with the provisions
of GB/T 1499.2.
7.7 Splicing property
7.7.1 It is recommended to use mechanical splicing for the bars. The
mechanical splicing joints shall use the alloy material with the same corrosion
resistance grade as the bar and shall be inspected in accordance with JGJ 107.
7.7.2 If welding splicing method is used, the welding process shall be
determined by both the supplier and the purchaser through negotiation and test.
The welding is performed using the welding material with the same corrosion
resistance grade. According to JGJ/T 27 and JGJ 18, the joint is inspected.
7.8 Corrosion resistance
7.8.1 The bars shall be subjected to corrosion resistance test. The industrial
atmospheric corrosion resistance bar is inspected according to YB/T 4368. The
chloride corrosion resistance bar is inspected according to YB/T 4367. The
chloride corrosion resistance bar, based on the needs of both the supplier and
the purchaser, may also be inspected according to YB/T 4369.
7.8.2 The relative corrosion rate of bars is calculated by formula (1). The bars,
compared with the designation HRB400 in GB/T 1499.2, have a relative
corrosion rate less than 70%.
8 Test methods
8.1 Inspection items
8.1.1 The inspection items, sampling quantities, sampling methods, and test
methods for each lot of bars shall comply with the requirements of Table 5.
Relative
corrosion rate
Average corrosion rate of corrosion resistance bar, average corrosion
rate of ordinary bar
Total length of sample Theoretical weight
9.2.2.1 The bars shall, in lots, be inspected and accepted. Each lot consists of
the bars of the same designation, the same furnace number, and the same
specification. The weight of each lot is usually no more than 60 t. For a portion
exceeding 60 t, for each additional 40 t (or a remainder of less than 40 t), ADD
one tensile test sample and one bend test sample.
9.2.2.2 It is allowed to form a mixed lot from different furnace numbers of the
same designation, the same smelting method, and the same pouring procedure.
However, the difference in carbon content of the furnace numbers is not more
than 0.02%; the difference in manganese content is not more than 0.15%. The
weight of the mixed lot is no more than 60 t.
9.2.3 Inspection items and sampling quantities
The inspection items and sampling quantities of the bars shall comply with Table
5 and Table 6.
9.2.4 Inspection results
The inspection result of each inspection item shall comply with the provisions
of Clause 6 and Clause 7.
9.2.5 Re-inspection and judgement
The re-inspection and judgement of the bars shall comply with the provisions of
GB/T 17505. However, the weight deviation item of the bars is not allowed to
be re-inspected.
10 Packaging, marking, and certification
10.1 The surface marking of the bars shall comply with the following
requirements:
a) The bars shall be marked with a designation on their surface. The
registered factory name (or trademark) and the nominal diameter
millimeter number may also be marked in sequence.
b) Bar designations are indicated by Arabic numerals plus English letters.
For example, HRB400a and HRB500a are represented by 4A and 5A,
respectively; HRB400aE and HRB500aE are represented by 4AE and
5AE, respectively; HRB400c and HRB500c are represented by 4C and
5C, respectively; HRB400cE and HRB500cE are represented by 4CE and
5CE, respectively. The factory name is indicated by the Chinese pinyin
initials. The nominal diameter in millimeters is expressed in Arabic
numerals.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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