GB/T 24202-2021 English PDF (GBT24202-2021)

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GB/T 24202-2021: Carbon steel wire for tension members of optical fiber cable
GB/T 24202-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
CCS H 49
Replacing GB/T 24202-2009
Carbon Steel Wire for Tension Members of Optical Fiber
Cable
ISSUED ON: APRIL 30, 2021
IMPLEMENTED ON: NOVEMBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Classification and Labeling ... 6
5 Ordering Content ... 6
6 Dimensions, Shape and Allowable Deviations ... 7
7 Technical Requirements ... 7
8 Inspection Methods ... 12
9 Inspection Rules ... 14
10 Packaging, Marking, Transportation, Storage, Quality Assurance Period and Quality
Certificate ... 14
Appendix A (informative) Shape and Dimensions of Spool ... 16
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement for GB/T 24202-2009 Carbon Steel Wire for Optical
Fiber Cable Tension Members. In comparison with GB/T 24202-2009, apart from editorial
modifications, the main technical changes are as follows:
a) Classification and labeling are added (see Chapter 4);
b) Zinc layer grade of galvanized steel wire is added to the ordering content (see Chapter
5);
c) The nominal diameter of steel wire is expanded to 0.35 mm ~ 3.0 mm (see 6.1; 6.2 of
Version 2009);
d) The term straightness is deleted, the inspection methods for ring diameter and warp
height are clarified, and the indicator requirements for free ring diameter are enhanced
(see 6.3; 5.2 of Version 2009);
e) The provisions on wire rods are modified (see 7.1.1; 6.1 of Version 2009);
f) The provisions on zinc ingots for galvanizing are added (see 7.1.2);
g) The scope of application of tensile strength grade is modified (see 7.2.1; 6.2 of Version
2009);
h) The provisions on the technical indicators of 0.35 mm  d < 0.50 mm steel wires are
added (see Chapter 7);
i) The 2,550 strength and corresponding torsion and repeated bending indicators are
added (see 7.3 and 7.4);
j) The provisions on knotting and stretching are added (see 7.5);
k) The provisions on the indicator and test method of modulus of elasticity are modified
(see 7.6 and 8.4; 6.5 and 7.5 of Version 2009);
l) “Residual ductility” is modified into “residual elongation” (see 7.7; 6.6 of Version
2009);
m) The indicator requirements for galvanizing weight are modified (see 7.8.1; 6.7.1 of
Version 2009);
Carbon Steel Wire for Tension Members of Optical Fiber
Cable
1 Scope
This document specifies the terms and definitions, classification and labeling, ordering content,
dimensions, shape and allowable deviations, technical requirements, inspection methods,
inspection rules, packaging, marking, transportation, storage, quality assurance period and
quality certificate of carbon steel wire for tension members of optical fiber cable.
This document is applicable to galvanized and phosphated round carbon steel wire for tension
members of optical fiber cable (hereinafter referred to as the steel wire). Steel wires for tension
members of cables with other purposes may take this as a reference.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document
through normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is 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 470-2008 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 Requirements for Acceptance, 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 9792 Conversion Coatings on Metallic Materials - Determination of Coating Mass Per
Unit Area - Gravimetric Methods
GB/T 22315 Metallic Materials - Determination of Modulus of Elasticity and Poisson’s Ratio
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 Numerical Values and Judgement of Testing Values for
Technical Standards of Metallurgy
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 phosphated steel wire
Finished steel wire that has been phosphated and has a phosphating film on the surface.
4 Classification and Labeling
4.1 The steel wire is classified into seven strength grades in accordance with the nominal tensile
strength (unit: MPa): 1370, 1570, 1770, 1960, 2160, 2350 and 2550.
4.2 In accordance with the surface conditions, the steel wire is classified into two categories:
phosphate and galvanized. Galvanized steel wire is classified into three grades: AB, C and E in
accordance with its galvanizing weight.
4.3 Examples of labeling are as follows:
EXAMPLE 1:
Carbon steel wire for tension members of optical fiber cable with a nominal diameter of 1.40 mm, a
strength grade of 1960 and surface phosphating is labeled as:
Phosphated steel wire for optical fiber cable 1.40-1960-GB/T 24202-2021
EXAMPLE 2:
Carbon steel wire for tension members of optical fiber cable with a nominal diameter of 1.60 mm, a
strength grade of 1570 and surface plated with E-grade zinc layer is labeled as:
Galvanized steel wire for optical fiber cable 1.60-1570-E-GB/T 24202-2021
5 Ordering Content
An ordering contract that complies with this document shall include the following main
contents:
a) Serial No. of this document;
9 Inspection Rules
9.1 Inspection and Acceptance
The inspection and acceptance of the steel wire before exiting the factory shall be carried out
by the supply-side. The demand-side also has the right to conduct inspection in accordance with
this document.
9.2 Batch Grouping Rules
The steel wire shall be inspected and accepted in batches. Each batch shall be composed of steel
wires with the same surface conditions, the same strength grade, the same zinc layer weight
grade and the same nominal diameter.
9.3 Sampling Location and Quantity
From one end of the inspected steel wire, take samples. The quantity of samples shall comply
with the provisions of Table 8. In accordance with the number of coils, take samples, but there
shall be no less than 1 coil.
9.4 Numerical Rounding and Judgment of Testing Values
The numerical rounding and judgment of testing values shall be carried out in accordance with
the provisions of YB/T 081.
9.5 Re-inspection and Judgment Rules
The re-inspection and judgment rules shall comply with the relevant provisions of GB/T 2103.
10 Packaging, Marking, Transportation, Storage, Quality
Assurance Period and Quality Certificate
10.1 Packaging
The steel wire shall be wrapped around the spool for delivery. Please refer to Appendix A for
the dimensions of ...