GB/T 25823-2026 Epoxy-coated steel wire and strand English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 25823-2026
Epoxy-coated steel wire and strand
环氧涂层钢丝及钢绞线
Issue date: 2026-08-27 Implementation date: 2027-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Product Marking
4.1 Marking of Epoxy-coated Steel Wires
4.2 Marking of Epoxy-coated Steel Strands
5 Ordering Information
6 Manufacturing Method
6.1 Surface Treatment
6.2 Coating Application
7 Materials
7.1 Steel Wires and Steel Strands
7.2 Epoxy Powder Coating
7.3 Patching Material
8 Technical Requirements
8.1 Epoxy-coated Steel Wires
8.2 Epoxy-coated Steel Strands
9 Test Methods
9.1 Epoxy-coated Steel Wires
9.2 Epoxy-coated Steel Strands
10 Coating Repair
11 Inspection Rules
11.1 Inspection Classification
11.2 Batch Grouping Rules
11.3 Inspection Items and Sampling Quantity
11.4 Type Inspection
11.5 Determination Rules and Retest
12 Packaging, Marking and Quality Certificate
12.1 Packaging
12.2 Marking
12.3 Quality Certificate
Annex A (Normative) Requirements for Epoxy Coating
A.1 Chemical Resistance
A.2 Chloride Ion Permeability
A.3 Impact Test
A.4 Salt Spray Test
A.5 Resistance to Dry-wet Cycling
Epoxy-coated Steel Wires and Steel Strands
1 Scope
This document specifies the product marking, ordering information, manufacturing method, materials, technical requirements, test methods, coating repair, inspection rules, packaging, marking and quality certificate for epoxy-coated steel wires and steel strands.
This document applies to epoxy-coated steel wires and seven-wire prestressing steel strands with individual wire epoxy coating used for prestressed engineering and components (such as bridges, buildings, rock anchorage, etc.).
This document is not applicable to monolithic coated or filled epoxy-coated steel strands.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 239.1 Metallic materials — Wire — Part 1: Unidirectional torsion test method
GB/T 2103 General rules for acceptance, packaging, marking and quality certificate of steel wires
GB/T 5223 Steel wires for prestressed concrete
GB/T 5224 Steel strands for prestressed concrete
GB/T 6461-2002 Metallic and other inorganic coatings on metallic substrates — Rating of specimens and test panels after corrosion tests
GB/T 10125 Artificial atmosphere corrosion test — Salt spray test
GB/T 13452.2 Paints and varnishes — Determination of film thickness
GB/T 17101-2026 Hot-dip galvanized or zinc-aluminium alloy coated steel wires for bridge cables
GB/T 19746-2018 Corrosion of metals and alloys — Salt solution immersion test
GB/T 20624.2 Paints and varnishes — Rapid deformation (resistance to impact) test — Part 2: Falling weight test (small area indenter)
GB/T 21839 Test methods for steel for prestressed concrete
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
epoxy coating powder
Thermosetting fusion-bonded powder coating with epoxy resin as the main film-forming material.
3.2
epoxy coating
Film formed by uniformly applying epoxy powder onto steel wire surface by electrostatic or other methods, followed by fusion, bonding and curing.
3.3
epoxy-coated steel wire; ECW
Steel wire uniformly covered with a dense protective epoxy coating on its surface.
3.4
individual epoxy-coated wire prestressing steel strand; IECS
Seven-wire prestressing steel strand where each individual wire is uniformly covered with a dense protective epoxy coating.
3.5
patching material
Material compatible with and comparable in performance to the epoxy coating, used to repair damaged and cut coating areas of epoxy-coated steel wires and steel strands.
4 Product Marking
4.1 Marking of Epoxy-coated Steel Wires
Product marking delivered in accordance with this document shall include: designation code ECW for epoxy-coated steel wire, nominal diameter, strength grade and this document number.
Example 1: Epoxy-coated steel wire with nominal diameter of 5 mm and strength grade of 1670 MPa, marked as:
ECW 5-1670-GB/T 25823-2026
Example 2: Epoxy-coated steel wire with nominal diameter of 7 mm and strength grade of 1770 MPa, marked as:
ECW 7-1770-GB/T 25823-2026
4.2 Marking of Epoxy-coated Steel Strands
Product marking delivered in accordance with this document shall include: designation code IECS for epoxy-coated steel strand, nominal diameter, strength grade and this document number.
Example 1: Epoxy-coated steel strand with nominal diameter of 15.2 mm and strength grade of 1860 MPa, marked as:
IECS 15.2-1860-GB/T 25823-2026
Example 2: Epoxy-coated steel strand with nominal diameter of 12.7 mm and strength grade of 1860 MPa, marked as:
IECS 12.7-1860-GB/T 25823-2026
5 Ordering Information
Contracts placed under this document shall contain the following main information:
a) This document number;
b) Product name;
c) Nominal diameter;
d) Strength grade;
e) Mass/Length;
f) Application;
g) Packaging requirements;
h) Other requirements specified by the purchaser.
6 Manufacturing Method
6.1 Surface Treatment
Prior to epoxy powder coating, the surface of steel wires or steel strands shall be cleaned by methods that do not impair their performance. No visually observable rust shall remain after cleaning.
6.2 Coating Application
6.2.1 Epoxy powder coating shall be applied within 10 min after cleaning of steel wires or steel strands, and no visually observable oxidation shall exist on the surface.
6.2.2 For cleaned steel wires, epoxy powder is electrostatically applied uniformly to the wire surface, then fused by heating, cooled and cured to produce epoxy-coated steel wires.
6.2.3 Cleaned steel strands shall be fully opened; epoxy powder is electrostatically applied uniformly to each wire surface. The strands are then heated for fusion, cooled for curing, re-twisted and restored to form epoxy-coated steel strands.
7 Materials
7.1 Steel Wires and Steel Strands
7.1.1 Steel wires for epoxy coating shall comply with GB/T 5223 or other relevant standards, and their surfaces shall be free from contaminants such as oil, grease and paint. Special requirements, if any, shall be specified in the contract.
7.1.2 Steel strands for epoxy coating shall comply with GB/T 5224 or other relevant standards, and their surfaces shall be free from contaminants such as oil, grease and paint. Special requirements, if any, shall be specified in the contract.
7.2 Epoxy Powder Coating
The coating formed by the epoxy powder coating used for application shall comply with Annex A.
7.3 Patching Material
Patching material shall be compatible with the epoxy coating and have comparable performance. The coating formed by patching material shall meet Annex A, and may be used at factory or construction site for repairing damaged coating of epoxy-coated steel wires and steel strands.
Standard
GB/T 25823-2026 Epoxy-coated steel wire and strand (English)
GB/T 25823-2026 Epoxy-coated steel wire and strand English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 25823-2026
Epoxy-coated steel wire and strand
环氧涂层钢丝及钢绞线
Issue date: 2026-08-27 Implementation date: 2027-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Product Marking
4.1 Marking of Epoxy-coated Steel Wires
4.2 Marking of Epoxy-coated Steel Strands
5 Ordering Information
6 Manufacturing Method
6.1 Surface Treatment
6.2 Coating Application
7 Materials
7.1 Steel Wires and Steel Strands
7.2 Epoxy Powder Coating
7.3 Patching Material
8 Technical Requirements
8.1 Epoxy-coated Steel Wires
8.2 Epoxy-coated Steel Strands
9 Test Methods
9.1 Epoxy-coated Steel Wires
9.2 Epoxy-coated Steel Strands
10 Coating Repair
11 Inspection Rules
11.1 Inspection Classification
11.2 Batch Grouping Rules
11.3 Inspection Items and Sampling Quantity
11.4 Type Inspection
11.5 Determination Rules and Retest
12 Packaging, Marking and Quality Certificate
12.1 Packaging
12.2 Marking
12.3 Quality Certificate
Annex A (Normative) Requirements for Epoxy Coating
A.1 Chemical Resistance
A.2 Chloride Ion Permeability
A.3 Impact Test
A.4 Salt Spray Test
A.5 Resistance to Dry-wet Cycling
Epoxy-coated Steel Wires and Steel Strands
1 Scope
This document specifies the product marking, ordering information, manufacturing method, materials, technical requirements, test methods, coating repair, inspection rules, packaging, marking and quality certificate for epoxy-coated steel wires and steel strands.
This document applies to epoxy-coated steel wires and seven-wire prestressing steel strands with individual wire epoxy coating used for prestressed engineering and components (such as bridges, buildings, rock anchorage, etc.).
This document is not applicable to monolithic coated or filled epoxy-coated steel strands.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 239.1 Metallic materials — Wire — Part 1: Unidirectional torsion test method
GB/T 2103 General rules for acceptance, packaging, marking and quality certificate of steel wires
GB/T 5223 Steel wires for prestressed concrete
GB/T 5224 Steel strands for prestressed concrete
GB/T 6461-2002 Metallic and other inorganic coatings on metallic substrates — Rating of specimens and test panels after corrosion tests
GB/T 10125 Artificial atmosphere corrosion test — Salt spray test
GB/T 13452.2 Paints and varnishes — Determination of film thickness
GB/T 17101-2026 Hot-dip galvanized or zinc-aluminium alloy coated steel wires for bridge cables
GB/T 19746-2018 Corrosion of metals and alloys — Salt solution immersion test
GB/T 20624.2 Paints and varnishes — Rapid deformation (resistance to impact) test — Part 2: Falling weight test (small area indenter)
GB/T 21839 Test methods for steel for prestressed concrete
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
epoxy coating powder
Thermosetting fusion-bonded powder coating with epoxy resin as the main film-forming material.
3.2
epoxy coating
Film formed by uniformly applying epoxy powder onto steel wire surface by electrostatic or other methods, followed by fusion, bonding and curing.
3.3
epoxy-coated steel wire; ECW
Steel wire uniformly covered with a dense protective epoxy coating on its surface.
3.4
individual epoxy-coated wire prestressing steel strand; IECS
Seven-wire prestressing steel strand where each individual wire is uniformly covered with a dense protective epoxy coating.
3.5
patching material
Material compatible with and comparable in performance to the epoxy coating, used to repair damaged and cut coating areas of epoxy-coated steel wires and steel strands.
4 Product Marking
4.1 Marking of Epoxy-coated Steel Wires
Product marking delivered in accordance with this document shall include: designation code ECW for epoxy-coated steel wire, nominal diameter, strength grade and this document number.
Example 1: Epoxy-coated steel wire with nominal diameter of 5 mm and strength grade of 1670 MPa, marked as:
ECW 5-1670-GB/T 25823-2026
Example 2: Epoxy-coated steel wire with nominal diameter of 7 mm and strength grade of 1770 MPa, marked as:
ECW 7-1770-GB/T 25823-2026
4.2 Marking of Epoxy-coated Steel Strands
Product marking delivered in accordance with this document shall include: designation code IECS for epoxy-coated steel strand, nominal diameter, strength grade and this document number.
Example 1: Epoxy-coated steel strand with nominal diameter of 15.2 mm and strength grade of 1860 MPa, marked as:
IECS 15.2-1860-GB/T 25823-2026
Example 2: Epoxy-coated steel strand with nominal diameter of 12.7 mm and strength grade of 1860 MPa, marked as:
IECS 12.7-1860-GB/T 25823-2026
5 Ordering Information
Contracts placed under this document shall contain the following main information:
a) This document number;
b) Product name;
c) Nominal diameter;
d) Strength grade;
e) Mass/Length;
f) Application;
g) Packaging requirements;
h) Other requirements specified by the purchaser.
6 Manufacturing Method
6.1 Surface Treatment
Prior to epoxy powder coating, the surface of steel wires or steel strands shall be cleaned by methods that do not impair their performance. No visually observable rust shall remain after cleaning.
6.2 Coating Application
6.2.1 Epoxy powder coating shall be applied within 10 min after cleaning of steel wires or steel strands, and no visually observable oxidation shall exist on the surface.
6.2.2 For cleaned steel wires, epoxy powder is electrostatically applied uniformly to the wire surface, then fused by heating, cooled and cured to produce epoxy-coated steel wires.
6.2.3 Cleaned steel strands shall be fully opened; epoxy powder is electrostatically applied uniformly to each wire surface. The strands are then heated for fusion, cooled for curing, re-twisted and restored to form epoxy-coated steel strands.
7 Materials
7.1 Steel Wires and Steel Strands
7.1.1 Steel wires for epoxy coating shall comply with GB/T 5223 or other relevant standards, and their surfaces shall be free from contaminants such as oil, grease and paint. Special requirements, if any, shall be specified in the contract.
7.1.2 Steel strands for epoxy coating shall comply with GB/T 5224 or other relevant standards, and their surfaces shall be free from contaminants such as oil, grease and paint. Special requirements, if any, shall be specified in the contract.
7.2 Epoxy Powder Coating
The coating formed by the epoxy powder coating used for application shall comply with Annex A.
7.3 Patching Material
Patching material shall be compatible with the epoxy coating and have comparable performance. The coating formed by patching material shall meet Annex A, and may be used at factory or construction site for repairing damaged coating of epoxy-coated steel wires and steel strands.
