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GB 13788-2008

Chinese Standard: 'GB 13788-2008'
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GB 13788-2008English90 Add to Cart 0--10 minutes. Auto immediate delivery. [GB/T 13788-2008] Cold rolled ribbed steel wires and bars [replaced by GB/T 13788-2017] Obsolete GB 13788-2008
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BASIC DATA
Standard ID GB 13788-2008 (GB13788-2008)
Description (Translated English) [GB/T 13788-2008] Cold rolled ribbed steel wires and bars [replaced by GB/T 13788-2017]
Sector / Industry National Standard
Classification of Chinese Standard H44
Classification of International Standard 77.140.60
Word Count Estimation 12,148
Date of Issue 2008-06-17
Date of Implementation 2009-06-01
Older Standard (superseded by this standard) GB 13788-2000
Quoted Standard GB/T 222; GB/T 228; GB/T 232; GB/T 238; GB/T 701; GB/T 2101; GB/T 2103; GB/T 4354; GB/T 10120; GB/T 17505; YB/T 081
Drafting Organization China Metallurgical Engineering Technology Co., Ltd. Beijing
Administrative Organization National Steel Standardization Technical Committee
Regulation (derived from) Announcement of Newly Approved National Standards No. 10 of 2008 (total 123)
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 specifies the rolled ribbed bars outline the definition, classification, grade, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificate. This standard applies to prestressed concrete and reinforced concrete with cold rolled ribbed steel, but also for the manufacture of welded cold-rolled ribbed steel bars.

GB/T 13788-2008 (GB 13788-2008)
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
GB/T 13788-2008
Replacing GB 13788-2000
Cold Rolled Ribbed Steel Wires and Bars
冷轧带肋钢筋
ISSUED ON. JUNE 17, 2008
IMPLEMENTED ON. JUNE 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope .. 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Classification and Designation ... 5
5 Dimension, Shape, Weight and Permissible Deviation .. 5
6 Technical Requirements ... 10
7 Test Methods ... 11
8 Inspection Rules ... 12
9 Package, Marking and Quality Certificate .. 13
Appendix A (Normative) Determination of Steel Bar at the Total Elongation with
Maximum Force ... 15
Appendix B (Informative) Reference Designations and Chemical Compositions
of Coils for Cold Rolled Ribbed Steel Wires and Bars ... 17
Foreword
This Standard replaced GB 13788-2000 Cold Rolled Ribbed Steel Wires and Bars.
Compared with GB 13788-2000, this Standard has the major changes as follows.
--- Deleted Designation-CRB1170 steel bars;
--- Added the indicator requirements for total elongation under maximum force;
--- Modified the yield ratio from 1.05 to 1.03;
--- Modified the load-lasting time in the stress relaxation test method to be 2min;
adopt 120h to calculate the relaxation rate of 1000h;
--- Improve the indicator of proof strength at non-proportional extension.
This Standard’s clauses are mandatory; thereof, the transvers rig height at 1/4 of h1/4
and transverse rib top width of b in Table 1, 5.4, 5.6, 6.1, 6.3.2 and Appendix B are
non-mandatory clauses; while the rest clauses are mandatory.
Appendix A in this Standard is normative; while Appendix B is informative.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel.
Drafting organizations of this Standard. China Jingye Engineering Technology Co., Ltd.,
China National Construction Steel Quality Supervision and Test Center, China
Metallurgical Information and Standardization Institute, Anyang Heli High-Speed Cold-
Rolled Co., Ltd., and ShenYang Xinfeng Cold Rolling Co., Ltd.
Chief drafting staffs of this Standard. Li Peixun, Zhang Ying, Feng Chao, Tao Ran, Di
Wenhai and Wu Chunju.
The historical editions replaced by this Standard are as follows.
--- GB 13788-1992, GB 13788-2000.
Cold Rolled Ribbed Steel Wires and Bars
1 Scope
This Standard specifies definitions, classification, designation, dimension, shape,
weight and permissible deviation, technical requirements, test methods, inspection
rules, package, marking and quality certificate of cold rolled ribbed steel wires and bars.
This Standard is applicable to the cold rolled ribbed steel wires and bars used for
prestressed concrete and ordinary reinforced concrete; it is also applicable to the cold
rolled ribbed steel wires and bars used for manufacture of welded mesh (hereinafter
referred to as steel bar).
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, 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 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-
2002, ISO 6892.1998 (E), EQV)
GB/T 232 Metallic Materials - Bend Test (GB/T 232-1999, ISO 7438.1985 (E), EQV)
GB/T 238 Metallic Materials - Wire - Reverse Bend Test
GB/T 701 Hot-Rolled Low Carbon Steel Wire Rods
GB/T 2101 General Provisions on Acceptance, Package, Marking and Quality
Certificate for Profile Steel
GB/T 2103 General Requirements for Acceptance, Packing, Marking and Quality
Certification of Steel Wire
GB/T 4354 Hot Rolled Quality Carbon Steel Wire Rods
GB/T 10120 Metallic Materials - Stress Relaxation Test
GB/T 17505 Steel and Steel Products General Technical Delivery Requirements
YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of Testing
Values for Technical Standards of Metallurgy
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 Cold-rolled ribbed steel wires and bars
After cold-rolling of hot-rolled steel wire rod, there are three-or-two-side transverse ribs
on its surface evenly distributed along the length direction.
3.2 Nominal diameter
The nominal diameter of plain bars with equivalent cross-section area.
3.3 Specific projected rib area
Ration of product AMONG transvers rib’s projected area on the perpendicular plane of
steel bar axis, nominal perimeter, AND transverse rib spacing.
3.4 Rib spacing
The projected chord length of discontinuous part of transverse rib, on the steel bar
circumference, perpendicular to the steel bar axial plane.
4 Classification and Designation
The designation of cold rolled ribbed steel wires and bars consists of CRB and
minimum tensile strength. C, R, B are the initials of Cold rolled, Ribbed, and Bar. The
cold rolled ribbed steel bar can be divided into four designations such as CRB550,
CRB650, CRB800, CRB970. CRB550 is the steel bar for ordinary reinforced concrete;
other designations are the steel bars for prestressed concrete.
5 Dimension, Shape, Weight and Permissible
Deviation
5.1 Nominal diameter range
treatment and other cold processing.
7.3.3 The initial test force applied to the specimen is 70% nominal tensile strength of
specimen multiplied by nominal cross-sectional area of specimen.
7.3.4 The loading speed is 200MPa/min±50MPa/min; start to record the relaxation
value after loading 3min~5min of the initial load and 2min of load-lasting.
7.3.5 The specimen length shall be no less than 60 times of nominal diameter.
7.3.6 At least 120h of test data is allowed to use to calculate the 1000h relaxation
rate.
7.4 Dimension measurement
7.4.1 The measurement of rib height shall measure the height of each column rib
with the same cross-section, then take the average value; the rib spacing shall
measure the average spacing; namely, take the center distance of the first and the
eleventh rib at the same column divided by 10; namely, the average value of rib spacing.
7.4.2 The accuracy of dimension measurement shall be 0.02mm.
7.5 Measurement of weight deviation
When measuring the weight deviation of steel bar, the specimen length shall be no
less than 500mm. The length measurement shall be accurate to 1mm; weight
measurement shall be accurate to 1g.
Weight deviation of steel bar shall be calculated as per Formula (3).
7.6 The rounding off and judgement of test result shall conform to the provisions of
YB/T 081.
8 Inspection Rules
8.1 Inspection and acceptance
The inspection and acceptance of steel bar shall be performed by the quality
supervision department of the supplier. The purchaser reserves the right to inspect.
The inspection and acceptance of steel bar shall be performed as per the provisions
of GB/T 17505.
Weight Deviation
Specimen’s actual weight – (specimen length × theoretical weight)
(specimen length × theoretical weight)
8.2 Batching rules
The steel bar shall be inspected and accepted in batches; each batch consists of the
steel bars with the same designation, the same shape, the same specification, the
same process, and the same delivery state; each batch is no greater than 60t.
8.3 Sampling quantity
The sampling quantity for inspection of steel bar shall conform to the provisions of
Related standard: GB/T 13788-2017    GB/T 24242.1-2020
Related PDF sample: GB/T 13788-2017    GB/T 14981-2009