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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces YB/T 4222-2010 Coated steel wire for overhead line helical fittings, and the following main changes have been made with respect to YB/T 4222-2010:
——The zinc-10% aluminum-rare earth alloy coating categories are added;
——The cold-drawn product categories are added;
——The indexes of elongation after fracture of cold-drawn coated steel wire are not assessed;
——The weight of class B coating is adjusted;
——The rounding off and judgment of numerical value are added.
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous edition of this standard is as follows:
——YB/T 4222-2010.
Coated steel wire for overhead line helical fittings
1 Scope
This standard specifies the classification and designation, order contents, technical requirements, inspection methods, inspection rules, rounding off and judgment of numerical value, packaging, marking and quality certificate of coated steel wire for overhead line helical fittings (hereinafter referred to as “steel wire”).
This standard is applicable to the coated steel wire for overhead line helical fittings such as overhead line helical suspension clamps, overhead line helical strain clamps and overhead line helical connecting strips.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test
GB/T 470 Zinc ingots
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
GB/T 2103 General provisions for checking, packing, marking and quality certification of steel wire
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 4354 Hot rolled quality carbon steel wire rods
GB/T 12689.1 Methods for chemical analysis of zinc and zinc alloys - Part 1: Determination of aluminum content - Chromazurol S polyethylene glycol octyl phenylether-cetylpyridine bromine spectrophotometry, Chromeazurol S spectrophotometric method and EDTA titrimetry
YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy
DL/T 763 Technical requirements for overhead line helical fittings
DL/T 766 Technical requirements and testing method of helical fittings for OPGW
DL/T 767 Technical requirements and testing method of helical fittings for ADSS
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
overhead line helical fittings
general name of all product categories specified in DL/T 763, DL/T 766 and DL/T 767
4 Classification and designation
4.1 Classification
4.1.1 Steel wires are divided into galvanized steel wires, galvanized-5% aluminum-rare earth alloy steel wires and galvanized-10% aluminum-rare earth alloy steel wires according to coating categories.
4.1.2 The steel wire is divided into Class A and Class B according to the coating weight.
4.1.3 The steel wires are divided into cold-drawn (L) coated steel wires and coated steel wires according to surface state.
4.2 Designation
Designation example 1: The steel wire with the surface state of cold-drawn, the coating category of zinc, the nominal diameter of 2.70mm, and the coating weight of Class B is designated as LZn-2.70-B-YB/T 4222-2018.
Designation example 2: The steel wire with the coating category of zinc-5% aluminum-rare earth alloy, the nominal diameter of 2.80mm, and the coating weight of Class A is designated as Zn5Al-2.80-A-YB/T 4222-2018.
Designation example 3: The steel wire with the coating category of zinc-10% aluminum-rare earth alloy, the nominal diameter of 3.02mm and the coating weight of Class A is designated as Zn10Al-3.02-A-YB/T 4222-2018.
5 Order contents
Order contracts made based on this standard shall cover the following main contents:
a) No. of this standard;
b) Product name;
c) Designation code;
d) Nominal diameter;
e) Coating type;
f) Coating class;
g) Quantity;
h) Other requirements.
6 Technical requirements
6.1 Diameter and permissible deviation
The nominal diameter and permissible deviation of steel wire shall meet those specified in Table 1.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 Order contents
6 Technical requirements
7 Inspection methods
8 Inspection rules
9 Rounding off and judgment of numerical value
10 Packaging, marking and quality certificate
Annex A (Normative) Determination of aluminum content in steel wire coating
