GB/T 5223-2014 PDF in English
GB/T 5223-2014 (GB/T5223-2014, GBT 5223-2014, GBT5223-2014)
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Steel wire for prestressing of concrete
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GB/T 5223-2014: PDF in English (GBT 5223-2014) ICS 77.140.15
H 49
National Standard of the People’s Republic of China
GB/T 5223-2014
Replacing GB/T 5223-2002
Steel Wire for Prestressing of Concrete
(ISO 6934-2:1991, Steel for the prestressing of concrete
- Part 2: Cold-drawn wire, NEQ)
Date of issue: June 24, 2014 Date of implementation: April 1, 2015
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
GB/T 5223-2014
Table of 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 Shape 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
GB/T 5223-2014
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 are essential for the application of this document. 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
the steel wire into which the wire rods is drawn by reducing and cold worked, supplied as
coil.
3.2
stress-relieved wire
GB/T 5223-2014
8.4.5 Elasticity modulus
Elasticity modulus is determined according to the requirements of GB/T 21839.
8.4.6 Test failure
Provided that the specimen is fractured in the chuck or within 2dn away from the jaw and
cannot meet the performance requirements of this standard, the test is invalid.
8.5 Reverse Bend Test
Reverse bend test of wire shall be carried out according to the requirements of GB/T
21839. The bend radius shall be in accordance with those specified in Table 5.
8.6 Bend Test
Wire bend test shall be carried out according to the requirements of GB/T 21839. Bending
angle and mandril diameter shall meet the corresponding requirements of 7.2.4.
8.7 Torsion Test
8.7.1 Torsion test shall be carried out according to the requirements of GB/T 21839.
8.7.2 Distance between fixtures of testing machine shall not be less than 210mm during
the test.
8.7.3 The torsion rate used shall not be greater than 30 r/min.
8.7.4 The axial tension is 0.5%~2% of the maximum force load of wire.
8.7.5 The specimen shall be twisted till complete fracture, and the fractured section shall
be vertical to the wire axis. The number of torsions shall meet those specified in Table 4.
8.7.6 If the twisted specimen has any helical crack that is visible to naked eyes or
touchable to bare hands on the surface, then the coil of wire shall be subjected to
reinspection according to the requirements of 8.7.7.
8.7.7 During the reinspection, the specimen is twisted three circles per 210mm long,
when the specimen is twisted to the specified circles, then stop for inspection. If there is
still any helical crack that is visible to naked eyes or touchable to bare hands on the
surface, then the coil of wire shall be judged as rejected.
8.7.8 If the specimen factures within 2dn from the chuck, and it has not reached the
number of torsions specified in this standard, then the test is invalid.
GB/T 5223-2014
The reinspection and judgment rules of wire shall be carried out according to GB/T 2103.
9.2 Characteristic Value Inspection
9.2.1 Characteristic value inspection is applicable to the following conditions:
a) The seller's inspection for product quality control;
b) The inspection that is requested by the purchaser and agreed by both the seller and the
buyer;
c) The third party's product certification and arbitration inspection.
9.2.2 Characteristic value inspection shall be carried out according to the rules in Annex
B.
10 Packaging, Marking and Quality Certificate
General requirements for wire packaging, marking and quality certificate shall meet the
requirements of GB/T 2103.
10.1 Packaging
Generally, wire shall be packaged according to Category A in GB/T 2103. It may be
packaged according to Category B or C specially to be noted in the contract.
10.2 Marking
Each wire coil shall be bolted with nameplate, indicating the seller's name, product name,
marking, specification, strength grade, batch number, executive standard No., weight and
numbers, etc.
10.3 Quality Certificate
Each contract batch shall be accompanied with quality certificate. In which, the seller's
name, product name, marking, specification, strength grade, batch number, executive
standard number, weight, quantity, the purchaser's name, shipment date and marking of
the quality inspection department shall be noted.
GB/T 5223-2014
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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