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This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 24202-2009 Carbon steel wire for optical fiber cable tension members. In addition to editorial changes, the following technical changes have been made with respect to GB/T 24202-2009:
a) the clause "Classification and labelling" is added (see Clause 4);
b) the zinc coating grade of galvanized steel wire in the order is added (see Clause 5);
c) the nominal diameter of steel wire is expanded to 0.35 mm ~ 3.0 mm (see 6.1; 6.2 of Edition 2009);
d) the term straightness is deleted, the test method of circle diameter and camber height is clarified, and the index requirement of free ring diameter is improved (see 6.3; 5.2 of Edition 2009).
e) the requirements of wire rods are changed (see 7.1.1; 6.1 of Edition 2009);
f) the provisions for zinc ingots for galvanization are added (see 7.1.2);
g) the applicable range of tensile strength grade is changed (see 7.2.1; 6.2 of Edition 2009);
h) the technical specifications of steel wires (0.35 mm ≤ d < 0.50 mm) are added (see Clause 7);
i) the strength of 2550 and the corresponding torsion and reverse bending indexes are increased (see 7.3 and 7.4);
j) the requirements of knot stretching are added (see 7.5);
k) the indexes and test methods requirements of elastic modulus are changed (see 7.6 and 8.4; 6.5 and 7.5 of Edition 2009);
l) the term "residual extend rate" is changed to "residual elongation" (see 7.7; 6.6 of Edition 2009);
m) the index requirements of galvanization weight are changed (see 7.8.1; 6.7.1 of Edition 2009);
n) the number of tightly wound turns of the wire on a mandrel of 3 times the nominal diameter is changed to not less than 6 (see 7.8.2; 6.7.2 of Edition 2009).
o) the measurement apparatus of the wire diameter is changed to a micrometer with a division value or resolving power of 0.001 mm (see 8.1; 7.2 of Edition 2009).
p) the term "stretching velocity" is changed to "elongation rate" (see 8.3; 7.4 of Edition 2009);
q) the numbers of samples of other inspection items of steel wire are modified, the types of inspection are increased, the specification that the test must be conducted "after the first one or two turns at one end of each disk were cut" is deleted (see 8.4; 7.5 and 8.3.3 of Edition 2009);
r) the provisions of numerical value rounding and determination of detected numerical value (see 9.4);
s) the provision "Therefore, spools shipped by various means of transportation shall be covered with rainproof tarpaulin and tied tightly for transportation" is deleted (see 9.3 of the Edition 2009);
t) the spool models of Type 250 and Type 400 are added in Annex A (see A.2).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183).
This document was firstly issued in 2009, and this edition is the first revision.
Carbon steel wire for tension members of optical fiber cable
1 Scope
This standard specifies the terms and definitions, classification, labelling, order contents, shapes, dimensions, allowable deviations, technical requirements, inspection methods, inspection rules, packaging, marking, transportation, storage, warranty period and quality certificates of carbon steel wires for tension members of optical fiber cables.
This document is applicable to galvanized and phosphatized round carbon steel wire used as tension member for optical fiber cable (hereinafter referred to as steel wire), and steel wire used for cable tension member for other purposes may be used as reference.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 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 poissons ratio
GB/T 24242.2 Non-alloy steel wire rod 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 document, the following term and definition apply.
3.1
phosphated steel wire
finished steel wire with phosphating treatment and phosphating film on the surface
4 Classification and labelling
4.1 Steel wires are divided into seven strength grades of 1370, 1570, 1770, 1960, 2160, 2350 and 2550 according to the nominal tensile strength (in MPa).
4.2 Steel wires are divided into phosphating and zinc coating according to the surface state. The galvanized steel wires are divided into three levels: AB, C and E according to their galvanized weights.
4.3 Examples for marking are as follows:
Example 1:
The carbon steel wire for tension members of optical fiber cable with phosphated surface, nominal diameter of 1.40 mm and strength grade of 1960, is marked as:
Phosphated steel wire for optical fiber cable 1.40-1960-GB/T 24202-2021
Example 2:
The carbon steel wire for tension members of optical fiber cable with nominal diameter of 1.60 mm, strength grade of 1570 and surface coated with Grade E zinc coating is marked as:
Galvanized steel wire for optical cable 1.60-1570-E-GB/T 24202-2021
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and labelling
5 Order contents
6 Dimension, shape and allowable deviation
7 Technical requirements
8 Inspection method
9 Inspection rules
10 Packaging, marking, transportation, storage, warranty period and quality certificate
Annex A (Informative) Shape and size of spool
