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GB/T 5223-2014

Chinese Standard: 'GB/T 5223-2014'
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Detail Information of GB/T 5223-2014; GB/T5223-2014
Description (Translated English): National Standard
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H49
Classification of International Standard: 77.140.15
Word Count Estimation: 20,281
Date of Issue: 6/24/2014
Date of Implementation: 4/1/2015
Older Standard (superseded by this standard): GB/T 5223-2002
Quoted Standard: GB/T 228.1; GB/T 2103; GB/T 21839; GB/T 24238; GB/T 24242.2; YB/T 081
Adopted Standard: ISO 6934-2-1991, NEQ
Drafting Organization: China Metallurgical Construction Research Institute Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee
Regulation (derived from): National Standards Bulletin No. 14 of 2014
Proposing organization: China Iron and Steel Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the terms and definitions of prestressed concrete steel wire, classification, code and markup, ordering the content, size, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, labeling, qu

ICS 77.140.15
H 49
National Standard of the People’s Republic of China
Replacing GB/T 5223-2002
Steel Wire for Prestressing of Concrete
预应力混凝土用钢丝
(ISO 6934-2. 1991, Steel for the prestressing of concrete
- Part 2. Cold-drawn wire, NEQ)
Issue date. 2014-06-24 Implementation date. 2015-04-01
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China .
GB
Contents
Foreword ... i
1 Scope .. 1
2 Normative References ... 1
3 Terms and Definitions ... 1
4 Classification, Code and Designation ... 2
4.1 Classification and Code ... 2
4.2 Designation ... 2
5 Order Content ... 3
6 Dimensions, Shape, Weight and Allowable Deviation ... 4
7 Technical Requirements ... 6
7.1 Manufacturing Method .. 6
7.2 Mechanical Property ... 7
7.3 Surface Quality .. 12
7.4 Straightness of Stress-relieved Wire ... 12
7.5 Fatigue Test ... 12
7.6 Hydrogen Embrittlement Sensitivity Stress Corrosion Test .. 12
8 Test Methods ... 13
8.1 Surface Inspection .. 13
8.2 Boundary Dimension Inspection ... 13
8.3 Weight Deviation .. 13
8.4 Tensile Test .. 14
8.5 Reverse Bend Test ... 15
8.6 Bend Test .. 15
8.7 Torsion Test .. 15
8.8 Hydrogen Embrittlement Sensitivity Stress Corrosion Test .. 16
8.9 Stress Relaxation Property Test ... 16
8.10 Heading Strength Test .. 16
8.11 Fatigue Test .. 16
8.12 Rounding off of Numerical Values .. 17
9 Inspection Rules .. 17
9.1 Delivery Inspection ... 17
9.2 Characteristic Value Inspection ... 19
10 Packaging, Marking and Quality Certificate ... 19
10.1 Packaging .. 19
10.2 Marking ... 19
10.3 Quality Certificate ... 19
Annex A (Normative) Hydrogen Embrittlement Sensitivity Stress Corrosion Test .. 20
Annex B (Normative) Inspection Rules for Characteristic Value ... 21
Foreword
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces and technically differs from GB/T 5223-2002 in the following
content.
——Prestressed steel wire of ordinary relaxation is deleted;
——Only cold drawn wire for pressure pipe is reserved;
——Coil weight is increased while inside diameter of coil is decreased; requirement for
weight deviation is added;
——The replacement of total elongation at maximum force with percentage elongation
after fracture is deleted; weight deviation calculation method is added;
——Specified characteristics load value replaces specified stress value to reduce
influence of area or diameter deviation;
——Specification for stress-relieved wire is added;
——Largest value of maximum force is specified; the requirements that actual strength of
each batch of delivered wire shall not be 200 MPa higher than nominal strength are
deleted;
——The initial stress in relaxation test is changed to a percentage of actual maximum
force from nominal tensile strength; requirements of initial stress being 60% maximum
force are deleted; the new requirements are that 1 000 h relaxation test, in which the initial
force is 70% of actual maximum force shall be made. If the buyer requires, 1 000 h
relaxation test in which initial force is 80% of actual maximum force may also be allowed;
——The specified non-proportional elongation stress σP0.2 is changed to 0.2% yield force
FP0.2; the nominal tensile strength percentage is changed to actual maximum force
percentage;
——Range of heading strength inspection is extended and no longer limited to wires for
sleeper;
——Reverse bend test made for wires with nominal diameter greater than 10mm is
changed to bending test;
——Property requirements for cold drawn wire for pressure pipe are improved;
——Test methods comply with GB/T 21839;
——Requirements of value rounding are added;
——Requirements for the characteristic value inspection, delivery inspection and type test
are added;
——An annex titled hydrogen embrittlement sensitivity stress corrosion test for cold drawn
wire for pressure pipe is added.
This standard is redrafted, compiled by reference to and nonequivalent to ISO 6934-2.
1991, Steel for the Prestressing of Concrete-Part 2. Cold-Drawn Wire. The main
differences are as follows.
——Spiral-ribbed steel wire is added;
——Strength grade is added;
——Yield ratio of low relaxation steel wire is increased;
——When cold drawn wire is used for pressure pipe, the requirements for its performance
is added by reference to ASTM A 648.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of National Technical Committee on Iron and Steel
of Standardization Administration of China (SAC/TC 183).
Previous editions of the standard replaced by this standard are as follows.
——GB/T 5223-1985, GB/T 5223-1995, GB/T 5223-2002.
Steel Wire for Prestressing of Concrete
1 Scope
This standard specifies the terms and definitions, classification, codes and designation,
order contents, dimension, shape, weight and allowable deviation, technical requirements,
test methods, inspection rules, packaging, marking and quality certificate of steel wire for
prestressing of concrete.
This standard applies to cold drawn or stress-relieved, low-relaxation, plain, helical rib and
indented wires, for prestressing of concrete, in which the cold drawn wire is used only for
pressure pipe. According to design and construction method, it is suitable to produce
highly efficient prestressed concrete by pre-tensioning method and post-tensioning
method.
2 Normative References
The following documents for the application of this document are essential. For dated
reference, only the edition cited applies. For undated references, the latest edition
(including any amendments) applies.
GB/T 228.1 Metallic Material—Tensile Test—Part 1. Method of Test at Room
Temperature
GB/T 2103 General Requirements for Acceptance, Packing, Marking and Quality
Certification of Steel Wire
GB/T 21839 Steel for Prestressed Concrete - Test Methods
GB/T 24238 Hot-rolled Wire Rod for Prestressed Steel and Steel Strand
GB/T 24242.2 Non-alloy Steel Wire Rods for Conversion to Wire—Part 2. Specific
Requirements for General Purpose Wire Rod
YB/T 081 Rule for Rounding Off of Numberical Values and Judgment of Testing
Values for Technical Standards of Metallurgy
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
cold drawn wire
steel wire into which the wire rods is drawn by reducing and cold worked and supplied as
coil.
3.2
stress-relieved wire
Steel wire which is produced by one of the following continuous processing method in one
time.
——low-relaxation steel wire is made when the steel wire is subject to short-time heat
treatment under plastic deformation (axial strain);
——ordinary relaxation steel wire is made when the steel wire is straightened and
thermally treated in short time at an appropriate temperature.
3.3
relaxation
time-dependent stress loss for a constant length.
3.4
helical rib wire
helical rib on the surface of steel wire, in a continuous and regular shape lengthwise (see
Figure 1).
3.5
indented wire
an indentation on the surface of steel wire, irregularly spaced lengthwise (see Figure 2).
4 Classification, Code and Designation
4.1 Classification and Code
4.1.1 Steel wire is divided into cold drawn wire and stress-relieved wire according to
processing state, of which the codes are.
Cold drawn wire WCD
Low-relaxation wire WLR
4.1.2 Steel wire is divided into plain, helical rib and indentation types according to the
shape, of which the codes are.
Plain wire P
Helical rib wire H
Indented wire I
4.2 Designation
4.2.1 Designation information
The designation of products delivered according to this standard shall include the
following contents.
a) Prestressed steel wire;
b) Nominal diameter;
c) Tensile strength grade;
Related standard:   GB/T 5223.3-2017  GB/T 5224-2014
   
 
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