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
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification, Code and Designation
4.1 Classification and Code
4.2 Designation
5 Order Content
6 Dimensions, Shape, Weight and Allowable Deviation
7 Technical Requirements
7.1 Manufacturing Method
7.2 Mechanical Property
7.3 Surface Quality
7.4 Straightness of Stress-relieved Wire
7.5 Fatigue Test
7.6 Hydrogen Embrittlement Sensitivity Stress Corrosion Test
8 Test Methods
8.1 Surface Inspection
8.2 Boundary Dimension Inspection
8.3 Weight Deviation
8.4 Tensile Test
8.5 Reverse Bend Test
8.6 Bend Test
8.7 Torsion Test
8.8 Hydrogen Embrittlement Sensitivity Stress Corrosion Test
8.9 Stress Relaxation Property Test
8.10 Heading Strength Test
8.11 Fatigue Test
8.12 Rounding off of Numerical Values
9 Inspection Rules
9.1 Delivery Inspection
9.2 Characteristic Value Inspection
10 Packaging, Marking and Quality Certificate
10.1 Packaging
10.2 Marking
10.3 Quality Certificate
Annex A (Normative) Hydrogen Embrittlement Sensitivity Stress Corrosion Test
Annex B (Normative) Inspection Rules for Characteristic Value
