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GB/T 5224-2023 English PDF (GBT5224-2023)

GB/T 5224-2023 English PDF (GBT5224-2023)

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GB/T 5224-2023: Steel strand for prestressed concrete
GB/T 5224-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
CCS H 49
Replacing GB/T 5224-2014
Steel Strand for Prestressed Concrete
(ISO 6934-4:2020, Steel for the Prestressing of Concrete - Part 4: Strand, NEQ)
ISSUED ON: AUGUST 6, 2023
IMPLEMENTED ON: MARCH 1, 2024
Issued by: State Administration for Market Regulation;
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 ... 7
4 Classification, Code and Labeling ... 8
4.1 Classification and Code ... 8
4.2 Labeling ... 8
5 Order Content ... 9
6 Dimensions, Cross-sectional Shape, Weight and Allowable Deviations ... 10
7 Technical Requirements ... 15
7.1 Manufacturing ... 15
7.2 Mechanical Properties ... 16
7.3 Surface Quality ... 21
7.4 Straightness of Steel Strands ... 21
7.5 Fatigue Properties, Deflection Tensile Properties and Stress Corrosion Properties... 21
8 Test Methods ... 21
8.1 Surface Inspection ... 21
8.2 Inspection of Overall Dimensions ... 21
8.3 Measurement and Calculation of Enlargement Ratio of Center Steel Wire Diameter of
1  7 Structured Steel Strands ... 22
8.4 Tensile Test ... 22
8.5 Straightness ... 23
8.6 Measurement and Calculation of Nominal Weight Deviation per Meter ... 23
8.7 Test of Stress Relaxation Properties ... 24
8.8 Fatigue Test ... 24
8.9 Deflection Tensile Test ... 25
8.10 Stress Corrosion Test ... 25
8.11 Numerical Rounding ... 25
9 Inspection Rules ... 25
9.1 Classification of Inspection ... 25
9.2 Delivery Inspection ... 26
9.3 Eigenvalue Inspection ... 27
10 Packaging, Marking and Quality Certificate ... 27
10.1 Packaging ... 27
10.2 Marking ... 28
10.3 Quality Certificate ... 28
Appendix A (normative) Eigenvalue Inspection Rules ... 29
A.1 Test Batch ... 29
A.2 Sampling and Inspection Quantity per Batch ... 29
A.3 Evaluation of Test Results ... 29
Bibliography ... 31
Steel Strand for Prestressed Concrete
1 Scope
This document specifies the classification, code and labeling, order content, dimensions, cross-
sectional shape, weight and allowable deviation, technical requirements, test methods,
inspection rules, packaging, marking and quality certificate of steel strand for prestressed
concrete.
This document is applicable to steel strand for prestressed concrete structures twisted from cold-
drawn round steel wires, indented steel wires and helical rib steel wires (hereinafter referred to
as the “steel strand”).
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 5223 Steel Wire for Prestressing of Concrete
GB/T 21839 Test Methods of Steel for Prestressing 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 standard strand
The steel strand twisted from cold-drawn round steel wires.
3.2 indented strand
The steel strand twisted from steel wires containing indentations.
3.3 helical rib strand
The steel strand twisted from steel wires containing helical ribs.
3.4 compact strand
The steel strand that is twisted, and then, cold-compacted.
3.5 nominal diameter
The nominal dimension of the diameter of the circumscribed circle of the steel strand.
3.6 stabilizing treatment
In order to reduce stress relaxation during application, the steel strand is subject to heat
treatment under a certain tension for a short period of time.
4 Classification, Code and Labeling
4.1 Classification and Code
The general structure of the steel strand is classified into the following 9 categories, and the
structure codes are:
a) Standard steel strand twisted from two cold-drawn round steel wires 1  2
b) Standard steel strand twisted from three cold-drawn round steel wires 1  3
c) Indented steel strand twisted from three steel wires containing indentations 1  3I
d) Standard steel strand twisted from seven cold-drawn round steel wires 1  7
e) Indented steel strand twisted from six steel wires containing indentations and one
cold-drawn round center steel wires 1  7I
f) Helical rib strand twisted from six steel wires containing helical ribs and one cold-
drawn round center steel wires 1  7H
g) Compact strand twisted from seven cold-drawn round steel wires, and then, cold-
compacted (1  7)C
h) 1 + 9 + 9 Seale steel strand twisted from nineteen cold-drawn round steel wires 1 
19S
i) 1 + 6 + 6/6 Warrington steel strand twisted from nineteen cold-drawn round steel
wires 1  19W
4.2 Labeling
The labeling of products delivered in accordance with this document shall include the following
content:
a) Prestressed steel strand;
b) Structure code;
c) Nominal diameter;
d) Strength level;
e) Serial No. of this document.
EXAMPLE 1: standard steel strand twisted from seven cold-drawn round steel wires, with a
nominal diameter of 15.20 mm and a tensile strength of 1,860 MPa is labeled as:
prestressed steel strand 1  7-15.20-1,860-GB/T 5224-2023
EXAMPLE 2: indented steel strand twisted from three steel wires containing indentations, with a
nominal diameter of 8.70 mm and a tensile strength of 1,860 MPa is labeled as:
prestressed steel strand 1  3I-8.70-1,860-GB/T 5224-2023
EXAMPLE 3: helical rib steel strand twisted from six steel wires containing helical ribs and one
cold-drawn round center steel wire, with a nominal diameter of 21.60 mm and a
tensile strength of 1,770 MPa is labeled as: prestressed steel strand 1  7H-21.60-
1,770-GB/T 5224-2023
EXAMPLE 4: compact steel strand twisted from seven cold-drawn round steel wires, then, cold-
compacted, with a nominal diameter of 12.70 mm and a tensile strength of 1,860
MPa is labeled as: prestressed steel strand (1  7)C-12.70-1,860-GB/T 5224-2023
EXAMPLE 5: Seale steel strand twisted from nineteen cold-drawn round steel wires, with a
nominal diameter of 21.8 mm and a tensile strength of 1,860 MPa is labeled as:
prestressed steel strand 1  19S-21.8-1,860-GB/T 5224-2023
5 Order Content
The order content includes, but is not limited to the following:
a) Serial No. of this document;
b) Product name;
c) Strength level;
d) Structure code;
e) Dimensions, length (or coil diameter) and weight (or quantity or coil weight) of the
steel strands;
f) Purpose.
7.3 Surface Quality
7.3.1 Unless the user has special requirements, there shall be no oil, grease and other substances
on the surface of the steel strands.
7.3.2 There shall be no detrimental defects that may affect the performance on the surface of
the steel strands. Axial surface defects are allowed, but their depth shall be less than 4% of the
diameter of a single steel wire.
7.3.3 Slight rust on the surface of the steel strands is allowed. There shall be no visible rust pits
on the surface.
7.3.4 Tempering color is allowed on the surface of the steel strands.
7.4 Straightness of Steel Strands
The straightness of t...
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