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GB 13788-2008

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标准详细信息 GB 13788-2008; GB13788-2008
中文名称: 冷轧带肋钢筋
英文名称: Cold rolled ribbed steel wires and bars
行业: 国家标准
中标分类: H44
国际标准分类: 77.140.60
字数估计: 12,000
发布日期: 2008-06-17
实施日期: 2009-06-01
旧标准 (被替代): GB 13788-2000
引用标准: 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
起草单位: 中国京冶技术工程有限公司、国家建筑钢材质量监督检验中心、冶金工业信息标准研究院、安阳市合力高速冷轧有限公司、沈阳市新峰冷轧有限公司
归口单位: 全国钢标准化技术委员会
标准依据: 国家标准批准发布公告2008年第10号(总第123号)
提出机构: 中国钢铁工业协会
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
范围: 本标准规定了冷轧带肋纲筋的定义、分类、牌号、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证书。本标准适用于预应力混凝土和普通钢筋混凝土用冷轧带肋钢筋, 也适用于制造焊接网用冷轧带肋钢筋。


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 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 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.
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
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.
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.
7.5 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
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
8.3 Sampling quantity
The sampling quantity for inspection of steel bar shall conform to the provisions of
Table 4.
8.4 Re-inspection and judgment rules
The re-inspection and judgment rules of steel bar shall conform to the provisions of
GB/T 17505.
9 Package, Marking and Quality Certificate
9.1 Each coil (bundle) of steel bars shall be bundled for at least 3 laps; the end shall
be bent into the coil.
of the rib spacing; one rib within the mark spacing shall be canceled, which is shown
in Figure 3; the steel bar can also be rolled with factory name or logo.
9.3 Each coil (bundle) of steel bar shall be suspended with no less than 2 signboards,
which indicate the manufacturer, production date, steel bar designation and
specification.
9.4 In addition to the above provisions, the steel bar’s package, marking and quality
certificate shall conform to the relevant provisions of GB/T 210...
   
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