GB/T 5223-2014 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 5223-2014 | English | 105 |
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Steel wire for prestressing of concrete
| Valid |
| GB/T 5223-2002 | English | 599 |
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Steel wires for the prestressing of concrete (ISO 6934-2: 1991, Steel for prestressing of concrete -- Part 2: Cold-drawn wire, NEQ) [including MODIFICATION 1]
| Obsolete |
| GB/T 5223-1995 | English | 439 |
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Steel wires for prestressed concrete
| Obsolete |
| GB 5223-1985 | English | 199 |
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2 days
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Steel wire for prestressed concrete
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 5223-2014
GB/T 5223-2014: Steel wire for prestressing of concrete---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/GBT5223-2014
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
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
the steel wire which is produced by one of the following continuous processing method in
one time.
3.3
relaxation
the phenomenon that stress is reduced in related to time, under a fixed length.
3.4
helical rib wire
the helical rib on the surface of steel wire, which has continuous and regular shape along
the length-direction (see Figure 1).
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.
4.1.2 Steel wire is divided into plain, helical rib and indentation types according to the
shape, of which the codes are.
4.2.1 Designation information
The designation of products delivered according to this standard shall include the
following contents.
4.2.2 Designation example
Example 1.cold drawn plain wire, 4.00 mm in diameter and tensile strength of 1670 MPa
shall be designated as.
5 Order Content
The order contract according to this standard shall include the following contents.
6 Dimensions, Shape, Weight and Allowable Deviation
6.1 The dimension and allowable deviation of plain wire shall meet the requirements
specified in Table 1.See Table 1 for theoretical weight per meter.
6.2 The dimension and allowable deviation of helical rib wire shall be in accordance with
those specified in Table 2.See Figure 1 for the shape. The nominal cross sectional area of
steel wire and theoretical weight per meter are the same as those of plain wire.
6.5 Out-of-roundness of prestressed steel wire shall not exceed a half of diameter
tolerance. At least 90% of indentations on any 600mm long indented wire shall be in
accordance with the pitch and shape specified in Table 3.
6.6 Coil weight
Each coil of wire contains one piece and the weight is not less than 1000kg. If there are at
least ten coils of wire, 10% of them are allowed to be less than 1000kg, but not less than
300kg.
6.7 Inside diameter of coil
6.8 Weight deviation
Wire weight per meter shall not be deviated from theoretical weight per meter by over
±2 %.
7 Technical Requirements
7.1 Manufacturing Method
7.1.1 The designation conforming to those specified in GB/T 24238 or GB/T 24242.2
GB/T 5223-2014
7.1.2 Wire shall be manufactured by putting hot-rolled wire rod into cold machining or
continuous stabilizing treatment after cold machining.
7.2 Mechanical Property
7.2.1 For cold drawn wire for pressure pipe without coating (plating), the mechanical
property shall meet the requirements specified in Table 4.0.2% yield force FP0.2 shall not
be less than 75 % of characteristic value FM of maximum force.
7.2.3 For stress-relieved indented wire, mechanical property, other than number of
bends shall meet the requirements specified in Table 5.For all the stress-relieved
indented wires regardless of their specifications, the number of bends shall not be less
than three.
7.2.6 According to supply agreement, wires of strength grades beyond Table 4 and
Table 5 can be provided and their mechanical property shall follow the agreement.
7.2.7 1 000 h relaxation value is allowed to be determined by estimation method. 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.
7.2.8 The seller shall conduct heading strength inspection, and the strength is not
less than 95% of nominal tensile strength of base material.
7.3 Surface Quality
7.3.1 Wire shall be free from any crack and oil stain or drawing stamp and mechanical
damage on the surface. The discontinuous longitudinal surface defects with depth not
greater than 4 % of nominal diameter of wire is allowed.
7.4 Straightness of Stress-relieved Wire
Take a wire with chord length of 1m; place it on a flat surface; the maximum natural
vector height on the inner side of chord and arc shall not be larger than 20mm.
7.5 Fatigue Test
Based on the agreement of both the seller and the buyer and as indicated in the contract,
the wire may be subjected to fatigue property test.
7.6 Hydrogen Embrittlement Sensitivity Stress Corrosion Test
Based on the agreement of both the seller and the buyer and as indicated in the contract, the
GB/T 5223-2014
8 Test Methods
8.1 Surface Inspection
Surface quality shall be visually inspected.
8.2 Shape Dimension Inspection
8.3 Weight Deviation
8.3.1 Weight of wire per meter shall be measured as follows. take 3 pieces of wire not
less than 500mm in length to the nearest 1mm; weigh the mass of wire to the nearest
0.1g; then calculate weight of wire per meter according to Formula (1).
8.4 Tensile Test
8.4.1 Maximum force
Tensile test for wire shall be carried out according to the requirements of GB/T 21839.
Nominal cross sectional area value of wire shall be taken for calculating the tensile
strength.
8.4.2 Yield force
Tensile test shall be carried out according to the requirements of GB/T 21839.Cross
sectional area of wire in the tensile test shall be calculated according to the nominal
diameter. It is required to determine value Fp0.2 by non-proportional stretching force.
8.4.4 Reduction of area
Reduction of area is determined according to the requirements of GB/T 228.1.The
fractured wire is measured for its diameter along two orthogonal directions where the
reduced section is the minimum (where necessary, the fractured parts of specimen shall
be butted), of which the average, d1, shall be taken. For the helical rib wire, the outer
contour shall be measured.
8.8 Hydrogen Embrittlement Sensitivity Stress Corrosion Test
For the cold drawn wire used in pressure pipe, the hydrogen embrittlement sensitivity
stress corrosion test shall be in accordance with the requirements of Annex A.
For the stress-relieved wire, the hydrogen embrittlement sensitivity stress corrosion test
shall be in accordance with the requirements of GB/T 21839.At 80% of the actually
measured maximum force, the specimen shall meet that -- the median is not less than
5h; for the single specimen, it is not less than 2h.
8.9 Stress Relaxation Property Test
8.9.1 The stress relaxation property test for wire shall be carried out according to the
requirements of GB/T 21839.
8.9.2 The specimen gauge length shall not be less than 60 times the nominal diameter.
9 Inspection Rules
Wire inspection is classified into characteristic value inspection and delivery inspection.
9.1 Delivery Inspection
9.1.1 Inspection and acceptance
The seller's quality inspection department is in charge of factory inspection of the products
according to those specified in Table 6, while the purchaser is in charge of inspection and
acceptance according to this standard.
9.1.2 Batching rules
Wire shall be subjected to inspection and acceptance by batch; each batch consists of
wire of the same-designation, same-specification and same-processing state; each batch
is no more than 60t.
9.1.3 Inspection item and sampling quantity
9.1.3.1 For wire of different varieties, the inspection item, sampling quantity,
sampling position and inspection method shall meet those specified in Table 6.
9.2 Characteristic Value Inspection
9.2.1 Characteristic value inspection is applicable to the following conditions.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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