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GB/T 5223-2014 English PDF

GB/T 5223-2014 (GB/T5223-2014, GBT 5223-2014, GBT5223-2014)
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GB/T 5223-2014English105 Add to Cart 0--9 seconds. Auto-delivery Steel wire for prestressing of concrete Valid GB/T 5223-2014
Standards related to: GB/T 5223-2014

BASIC DATA
Standard ID GB/T 5223-2014 (GB/T5223-2014)
Description (Translated English) Steel wire for prestressing of concrete
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H49
Classification of International Standard 77.140.15
Word Count Estimation 20,268
Date of Issue 2014/6/24
Date of Implementation 2015/4/1
Older Standard (superseded by this standard) GB/T 5223-2002
Quoted Standard GB/T 228.1; GB/T 2103; GB/T 21839; GB/T 24238; GB/T 24242.2; YB/T 081
Adopted Standard ISO 6934-2-1991, NEQ
Drafting Organization China Metallurgical Construction Research Institute Co., Ltd.
Administrative Organization National Steel Standardization Technical Committee
Regulation (derived from) National Standards Bulletin No. 14 of 2014
Proposing organization China Iron and Steel Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the terms and definitions of prestressed concrete steel wire, classification, code and markup, ordering the content, size, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, labeling, qu

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 ...