GB 13788-2024 PDF English
US$155.00 · In stock · Download in 9 secondsGB 13788-2024: Cold rolled ribbed steel bars Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 13788: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 13788-2024 | English | 155 |
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Cold rolled ribbed steel bars
| Valid |
| GB/T 13788-2017 | English | 115 |
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Cold rolled ribbed steel bars
| Obsolete |
| GB 13788-2008 | English | 85 |
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[GB/T 13788-2008] Cold rolled ribbed steel wires and bars [replaced by GB/T 13788-2017]
| Obsolete |
| GB 13788-2000 | English | 519 |
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Cold rolled ribbed steel wires and bars [including MODIFICATION 1]
| Obsolete |
| GB 13788-1992 | English | RFQ |
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Cold rolled ribbed steel wires and bars
| Obsolete |
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GB 13788-2024: Cold rolled ribbed steel bars---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB13788-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.15
CCS H 44
Replacing GB/T 13788-2017
Cold Rolled Ribbed Steel 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
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Designation... 5
5 Dimensions, Shape, Weight and Allowable Deviations... 5
6 Raw Materials and Properties... 10
7 Test Methods... 11
8 Inspection Rules... 13
9 Packaging, Marking and Quality Certificate... 13
Appendix A (normative) Hot-rolled Wire Rods for Cold-rolled Ribbed Steel Bars... 15
Cold Rolled Ribbed Steel Bars
1 Scope
This document specifies the designation, dimensions, shape, weight and allowable deviations,
raw materials and properties, test methods, inspection rules, packaging, marking and quality
certificate of cold rolled ribbed steel bars (hereinafter referred to as the steel bars).
This document is applicable to cold rolled ribbed steel bars for ordinary reinforced concrete,
manufacturing welded mesh and prestressing concrete.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 2101 General Requirement of Acceptance, Packaging, Marking and Certification for
Section Steel
GB/T 2103 General Requirements for Acceptance, Packaging, Marking and Quality
Certification of Steel Wire
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 21839 Test Methods of Steel for Prestressing Concrete
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
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 cold rolled ribbed steel bars
Steel bars with transverse ribs evenly distributed along the length direction on their surface after
hot-rolled round wire rods are subjected to cold rolling.
3.4 rib spacing
The chord length of the discontinuous part of the transverse rib on the circumference of the
steel bars projected on a plane perpendicular to the axis of the steel bars.
4 Designation
There are five designations for the steel bars. CRB550, CRB600H, CRB650, CRB800 and
CRB800H.
5 Dimensions, Shape, Weight and Allowable Deviations
5.1 Nominal Diameter Ranges
The nominal diameter range of CRB550 steel bars is 4 mm ~ 12 mm, the nominal diameter
range of CRB600H steel bars is 4 mm ~ 16 mm, and the nominal diameters of CRB650 steel
bars and above are 4 mm, 5 mm and 6 mm.
5.2 Shape
5.2.1 Shape requirements
CRB600H shall have two-sided ribs (see Figure 1), CRB550 and CRB650 shall have three-
sided ribs (see Figure 2). Upon negotiation between the supply-side and the demand-side,
CRB800 and CRB800H are allowed to adopt other shapes.
5.2.2.6 The specific projected rib area fr shall be determined in accordance with Formula (1).
5.3 Dimensions, Weight and Allowable Deviations
The dimensions, weight and allowable deviations of the steel bars with two-sided ribs and three-
sided ribs shall comply with the stipulations of Table 1.
supply-side and the supply-side, it is allowed to be replaced by the inspection data of the same
designation continuously produced with the same raw materials and the same process.
7.2 Mechanical Properties
The nominal cross-sectional areas listed in Table 1 are used to calculate the strength of the steel
bars.
7.3 Stress Relaxation Test
7.3.3 The initial test force applied onto the specimen is 70% of the nominal tensile strength of
the specimen multiplied by the nominal cross-sectional area of the specimen.
7.3.4 The loading speed is 200 MPa/min 50 MPa/min. The loading of the initial load shall be
completed within 3 ~ 5 minutes. After maintaining the load for 2 minutes, start recording the
relaxation value.
7.3.5 The length of the specimen is not less than 60 times the nominal diameter.
7.3.6 It is allowed to use test data of at least 120 h to extrapolate the 1,000-h relaxation rate
value.
7.4 Dimensional Measurements
7.5 Measurement of Weight Deviations
When measuring the weight deviations of the steel bars, the length of the specimen shall not be
less than 500 mm.
8 Inspection Rules
8.1 Inspection and Acceptance
The inspection and acceptance of the steel bars shall be carried out by the supply-side’s quality
supervision department. The demand-side has the right to conduct inspection.
8.3 Sampling Quantity
The sampling quantity for steel bar inspection shall comply with the provisions of Table 4.
8.4 Re-inspection and Determination
The re-inspection and determination of the steel bars shall comply with the provisions of GB/T
17505.
9 Packaging, Marking and Quality Certificate
9.1 Each plate (bundle) of steel bars shall be evenly tied with no less than 3 tracks, and the ends
shall be bent into the plate.
9.2 The steel bars shall be rolled with obvious and complete steel bar designation marks. The
interval of the marks is twice the interval of the transverse ribs.
go, and shall
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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