GB/T 33026-2017 English PDF (GBT33026-2017)

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GB/T 33026-2017: High strength steel wire strand for building structures
GB/T 33026-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
High strength steel wire strand for building structures
ISSUED ON: FEBRUARY 28, 2017
IMPLEMENTED ON: NOVEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification and designation ... 5 
5 Order content ... 7 
6 Material ... 7 
7 Technical requirements ... 8 
8 Inspection methods ... 11 
9 Inspection rules ... 12 
10 Marking, packing, certificate, transportation, and storage ... 14 
Appendix A (Informative) Typical structural and performance parameters of
steel wire strand ... 16 
Appendix B (Informative) Determination of aluminum content in steel wire
coating ... 18 
High strength steel wire strand for building structures
1 Scope
This Standard specifies the terms and definitions, classification and designation,
order content, material, technical requirements, inspection methods, inspection
rules, marking, packing, certificate, transportation, and storage of high strength
steel wire strand (hereinafter referred to as steel wire strand) for building
structures.
This Standard is applicable to steel wire strand for building structures with a
nominal tensile strength of not less than 1570 MPa.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 238 Metallic materials - Wire - Reverse bend test
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test
GB/T 1839 Test method for gravimetric determination of the mass per unit
area of galvanized coatings on steel products
GB/T 2104 Steel wire ropes - Packing, marking and certificate - General
requirements
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 8358 Steel wire ropes - Determination of measured breaking force
GB/T 8706 Steel wire ropes - Vocabulary, designation and classification
GB/T 24191 Steel wire ropes - Determination of the actual modulus of
elasticity
YB/T 4541 Zinc-5% aluminum-mixed mischmetal alloy-coated steel wire for
building engineering
YB/T 5343-2015 Steel wire for ropes
3 Terms and definitions
The terms and definitions defined in GB/T 8706 and the following apply to this
document.
3.1 High strength steel wire strand
A steel wire strand made of several steel wires with a nominal tensile strength
of not less than 1570 MPa.
3.2 Effective cross-section area of steel wire strand
The sum of cross-section areas of all steel wires calculated from the nominal
diameter of a single steel wire.
4 Classification and designation
4.1 Classification
4.1.1 Classification according to the cross-section structural form of steel
wire strand
The steel wire strands, according to the cross-section structural form, are
classified into 1×7, 1×19, 1×37, and 1×n. The schematic diagrams and
parameters of the typical structures are shown in Table 1. According to the
agreement between the supplier and the purchaser, steel wire strands of other
structures and specifications may be manufactured.
4.2.2 Designation examples
Example 1: TAKE galvanized steel wire strand in conformity with GB/T 33026-2017, with
a nominal diameter of φ52 mm, a steel wire strand structure of 1×127, and nominal tensile
strength of 1670 MPa as an example. It is designated as:
Zn 52/1670/1×127-GB/T 33026-2017
Example 2: TAKE zinc-5% aluminum-mischmetal alloy-coated steel wire strand in
conformity with GB/T 33026-2017, with a nominal diameter of φ52 mm, a steel wire strand
structure of 1×127, and nominal tensile strength of 1570 MPa as an example. It is
designated as:
Zn-5%Al-RE 52/1570/1×127-GB/T 33026-2017
5 Order content
The contract for ordering in accordance with this Standard shall mainly include
the following contents:
a) This Standard number;
b) Product name;
c) Coating of steel wire;
d) Structure (code);
e) Nominal diameter;
f) Nominal tensile strength level;
g) Quantity (length or mass);
h) Other requirements.
6 Material
6.1 Galvanized steel wire for steel wire strands shall comply with the relevant
provisions of Class A of general-purpose steel wire in YB/T 5343-2015.
6.2 Zinc-5% aluminum-mischmetal alloy-coated steel wire for steel wire strands
shall comply with the relevant provisions of YB/T 4541.
7 Technical requirements
7.1 Twisting
7.1.1 The steel wire for steel wire strands shall be steel wire of the same
nominal diameter (other than the center wire), the same nominal tensile
strength, and the same coating category.
7.1.2 When the steel wire strands are twisted, the twist direction of adjacent
layers shall be opposite; the outer layer should be right-twisted.
7.1.3 The lay length of outer layer of steel wire strand is 8~13 times the nominal
diameter of the steel wire strand.
7.1.4 The distance between any two welded joints of steel wire in steel wire
strand products shall not be less than 50 m. The joints shall be anti-corrosion
treated. There shall be no welded joints within one lay length of the two ends.
The tensile strength of the welding position shall not be less than 50% of the
nominal tensile strength of the steel wire of corresponding level. The outer steel
wire shall not have any form of steel wire joint.
7.2 Appearance
7.2.1 The surface of steel wire strands shall be neat and tidy, arranged neatly,
without cross-dislocation, and shall not have defects such as scratches, rust,
hard bending.
7.2.2 The surface of the steel wire of steel wire strands shall be smooth and
clean. There shall be no folding, skip plating, cracks, pitting, scratches, or other
surface defects which affect the use.
7.2.3 The steel wire strands shall have a uniform color. The surface color of
zinc-5% aluminum-mischmetal alloy-coated steel wire strand, after exposure to
air, is allowed to change.
7.3 Dimensions
7.3.1 Allowable deviation of length
The allowable deviation of length of steel wire strand is 0~+5% of the order
length.
7.3.2 Allowable deviation of diameter
The allowable deviation of diameter of steel wire strand is 0~+3% of the nominal
diameter. The ratio OF the difference between the two measurement results at
8.3.1 Modulus of elasticity
The modulus of elasticity of steel wire strand shall be measured in accordance
with GB/T 24191.
8.3.2 Minimum breaking force of steel wire strand
The measured minimum breaking force of steel wire strand shall not be less
than 95% of the minimum theoretical breaking force. The measurement shall
be carried out in accordance with the provisions of GB/T 8358.
8.4 Dismantle strand wire of steel wire strand
8.4.1 The tensile strength of dismantle strand wire of steel wire strand shall be
measured in accordance with the provisions of GB/T 228.1.
8.4.2 The measurement of reverse bend test of dismantle strand wire of steel