GOST 1668-73

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  ГОСТ 1668-73

GOST 1668−73 galvanized steel Wire for overhead communication lines. Specifications (with Amendments No. 1, 2, 3)

GOST 1668−73
Group V72

INTERSTATE STANDARD

GALVANIZED STEEL WIRE FOR AERIAL COMMUNICATION LINES

Specifications

Steel zinc-coated wire for aerial lines. Specifications

OKP 12 1100

Date of introduction 1975−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 03.08.73 N 1914

3. REPLACE GOST 1668−46

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 4−93 of the Interstate Council for standardization, Metrology and certification (ICS 4−94)

6. EDITION with Amendments No. 1, 2, 3, approved in February 1983, December 1984, March 1989 (IUS 5−83, 3−85, 6−89)


This standard applies to steel wire for conductors of overhead lines.

(Changed edition, Rev. N 3).

1. BASIC PARAMETERS AND DIMENSIONS

1.1. The wire is made depending on the brand of wire rod;

copper — M,

ordinary;

for precision manufacturing:

normal exactly

high accuracy — P;

depending on the surface density of zinc two classes

1st class — 1,

2nd class — 2.

1.2. The diameter of the wire and limit deviation shall be as specified in table.1.

Table 1

mm

1.3. Ovality of the wire (the difference between the largest and smallest diameter of the same cross section) shall not exceed the limit deviation for diameter.

Examples of symbols

Linear wire with a diameter of 4.00 mm ordinary, high accuracy, 1st class:

Wire 4P-1 GOST 1668−73

Linear wire with a diameter of 4.00 mm copper, normal accuracy, 2nd class:

Wire 4 M-2 GOST 1668−73

1.1−1.3 (Revised edition, Edit. N 3).

2. TECHNICAL REQUIREMENTS

2.1. Wire shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner, of the wire rod according to the normative document.

(Changed edition, Rev. N 2).

2.2. Mechanical properties the wire shall conform to the standards specified in table.2.

Table 2

Notes:

1. The manufacturer guarantees the conformity of mechanical properties wire diameter 2.5−6.0 mm standards given in table.2 of this standard, after 20 days from the date of manufacture.

2. In the first two days since the heat treatment allowed the acceptance of the factory wire diameter 2.5−6.0 mm with a temporary tear resistance of not less than 330 MPa (34 kgf/mm).


(Changed edition, Rev. N 2, 3).

2.3. The zinc coating on the wire must be continuous, without gaps or cracks visible without using the magnifying devices.

Separate nodules of zinc grounds for zabrakovanie can’t serve.

Slight risks, dents, separate roughness of the zinc coating, as well as the heterogeneity of the surface of the wire by color, white spots, glitter and white plaque in the form of adhering zinc oxide if the coating can withstand the number of dives specified in the table.3.

Table 3

2.4. Adhesion of zinc coating to the steel core must be strong. The zinc coating should not crack and flake off when the spiral wrapping of the wire in eight tight turns on a cylindrical rod with a diameter specified in table.3A. Surface powdery peeling of the zinc coating on the wound samples galvanized wire acceptance sign is not.

Table 3A

2.5. Surface density of zinc and the number of dives for 60 s in a solution of sulphate of copper must conform to the standards specified in table.3.

2.6. Electrical resistivity of the wire at a temperature of 20 °C shall not exceed:

copper — of 0.146 Ohms·mm/m;

common — 0,138 Ohm·mm/m.

By agreement between manufacturer and consumer electrical resistivity of the wire must not exceed:

copper — 0,138 Ohm·mm/m;

common — 0,130 Ohm·mm/m.

The norms of maximum permissible values of electric resistance of 1 m wire is given in Annex 1, 2 and 3.

2.4−2.6. (Changed edition, Rev. N 3).

2.7. Wire is manufactured in coils consisting of one segment. The wire should be wound separatornyi rows and free to Mosey skeins. When releasing the skeins from the bindings wire not be withdrawn in «eight».

2.8. Weight of wire on a reel shall be as defined in table.4.

Table 4

Note. Permitted coils of wire weighing 50% less than that specified in table.4 not more than 10% of the total weight of coils of wire in the party.

2.7, 2.8. (Changed edition, Rev. N 2).

3. ACCEPTANCE RULES

3.1. Wire take parties. The party should consist of wire of the same species and the same size and shape a single document about quality that contains:

trademark or the name and trademark of manufacturer;

symbol wire;

the net mass;

the results of the tests;

the date of manufacture.

(Changed edition, Rev. N 2).

3.2. For visual inspection and measurement of wire, and also to check the weight of the skeins from each batch selected 3% of the skeins, but not less than three skeins.

3.3. From the wire, as adopted pursuant to section 3.2 this standard shall take 3% of the skeins, but not less than three coils, to check its mechanical properties, the quality of zinc coating and electrical resistance.

3.4. If unsatisfactory test results of at least one of the indicators it is carried out re-tests on twice the number of samples taken from coils of the number of not passed tests.

The results of repeated tests apply to the entire party.

3.3, 3.4. (Changed edition, Rev. N 2).

4. TEST METHODS

4.1 a. To determine the mechanical properties of the wire, adhesion of the zinc coating to the steel core, the surface density of zinc, the number of dives, the electrical resistance is taken one sample from each controlled roll.

(Added, Rev. N 2).

4.1. Visual inspection of wire is carried out visually.

4.2. Wire diameter is measured measuring instrument with a scale interval of 0.01 mm in two mutually perpendicular directions of the same cross-section in at least three areas of a coil. To measure the diameter choose a section of wire with a smooth surface without nodules zinc.

4.3. Test wire tensile is carried out according to GOST 10446 on samples with calculated length less than 200 mm.

4.4. Test the wire on the bend is carried out according to GOST 1579.

4.5. The copper content in the wire is certified by a document of the supplier of the original metal.

At the request of the consumer to check the finished copper wire copper content GOST and GOST 22536.0 22536.8.

4.6. Quality testing of zinc coating wire winding is carried out according to GOST 10447.

4.7. Surface density of zinc determine the weight or volume-gasometrical methods.

The weight method is used for particularly precise definition in the case of disagreements in the assessment of the quality of the wire.

The length of the wire specimen to determine the surface density of zinc must conform to the standards specified in table.5.

Table 5

mm

The samples are allowed to cut into any number of segments depending on the test conditions.

(Changed edition, Rev. N 2).

4.7.1. Space-gasometrical method

Removing zinc coating produced in a device consisting of a reservoir and connected to it with a rubber hose, a glass burette with two taps, in full immersion of the samples in the solution at ambient temperature until the cessation of gassing.

The test is carried out in the following order:

take several samples of wire and measure set for test length in accordance with the requirements of table.5;

degreased wire samples in alcohol, benzene, or gasoline and wipe with a clean cloth;

dissolve the zinc coating, completely catching the evolved hydrogen;

measure the volume of evolved hydrogen gas and lead to normal conditions (pressure of 760 mm Hg.St., temperature 0 °C) using the correction factor table;

calculate the average surface density of zinc per 1 mof the wire surface, (a) in grams by the formula

,

where is the volume of hydrogen under normal conditions, cm;

 — the nominal diameter of the wire specimen, mm;

 — length of sample, mm.

Bleeding zinc is produced in an aqueous solution of the mixture of acids:

sulfuric according to GOST 4204 — 100 g/DM,

a salt according to GOST 3118 — 34 g/DM

or in the inhibited solution of sulfuric acid prepared in the following manner: 2 g of SbOor AsOdissolved in 60 cmof hydrochloric acid according to GOST 3118, density of 1.19 g/cmand made up to 1 DMof sulfuric acid according to GOST 4204, a concentration of 80 g/DM.

The bleed solution is replaced as it is exhaustion.

(Changed edition, Rev.

N 2, 3).

4.7.2. Weight method

Surface density of zinc is determined by dissolving the coating from the samples of wire in a solution of inhibited sulphuric acid of the composition specified in claim 4.7.1.

The test is carried out in the following order:

samples of galvanized wire is degreased in alcohol, benzene, or gasoline and wipe with a clean cloth;

weighed samples;

dissolve the zinc coating;

washed the samples in distilled water;

wipe with a clean cloth to remove moisture and weighed again;

measure the actual diameter of the specimen after etching zinc;

calculate the average surface density of zinc per 1 mof the wire surface () in grams by the formula

,

where is the mass of the sample wire (Swatch group) before removing the coating, g;

the mass of the sample wire (Swatch group) after removing the coating, g;

 — diameter of the wire specimen after the etching of the coating, mm.

The magnitude of and compute with accuracy to 0.001 g, the size  — accurate to 0.01 mm, the average surface density of zinc, up to 0.1 g/m.

(Changed edition, Rev. N 2)

.

4.8. The continuity and uniformity of the zinc coating is controlled by immersion of the sample of galvanized wire in a solution of copper sulphate, prepared by dissolving one part by weight of dry crystal of copper sulphate according to GOST 4165 in five weight parts of distilled water and neutralized with an excess of freshly precipitated hydrate of copper oxide. After neutralization the solution should be filtered. The density of the filtered neutralized solution should be 1,114−1,116 g/cm.

The temperature of the solution of copper sulphate during the test must be (18±2) °C.

The order of testing the following:

take several samples of wire of 150 mm, washed with alcohol, gasoline or benzene.

If the samples are washed with petrol or benzene, to produce additional rinsing them with distilled water and wipe to remove moisture;

immerse the samples in a solution of copper sulphate to a depth of not less than 100 mm.

The samples must take exactly 1 min.

After each immersion in the solution samples immediately washed with distilled water and wipe with a clean cloth. The number of samples simultaneously immersed in the solution should not be more than six.

Samples of wire must be copper sulfate solution in a stationary position, not in contact with each other and with the walls of the vessel.

Acceptable number of samples for test in the same solution of copper sulphate with a volume of 200 cmshall be those specified in table.6.

Table 6

If after a set number of dives in the solution on the surface of the wire specimen will be the areas covered with copper, which, when wiping the sample with cotton wool or a clean cloth, then the sample is considered to be not stand the test. The samples are examined with the naked eye.

On the surface of samples allowed:

the heterogeneity in color and luster;

redness in the area, located at a distance of 25 mm from the solution level and at a distance of 20 mm from the immersed in the solution the lower end of the sample;

brown color and the redness of point character, disappearing or increasing in value and color intensity with an additional immersion of the sample in a copper sulfate solution for 1−2 s.

4.9. Electrical resistance to direct current is determined with the aid of double bridge Thompson with accuracy to 0.00001 Ohm. Simultaneously measures the temperature of the room in which carry out the test.

The recalculation of the resistance of a wire of length 1 m at a temperature of °C on the resistance of the same wire at a temperature of 20 °C produces according to the formula

.

Electrical resistivity is calculated according to the formula

,

where is the cross-sectional area of the wire.

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Each coil of wire shall be tied in at least three places soft galvanized wire according to GOST 3282, or another wire in the normative documentation and is wrapped with a layer of paper, then a layer of non-woven materials or fabrics from chemical fibers, or a polymer film.

In mechanised packing of each coil of wire shall be wrapped by layer cable crepe paper according to GOST 10396 or paper brand CMS-170, or other creped paper, equal in protective properties.

The quality of packaging materials used:

the waxed paper according to GOST 9569 (you may use a double layer of wrapping paper according to GOST 8828 or other securities that provide protection against corrosion);

the polymeric film according to GOST 10354 or GOST 16272, or other polymer film;

container holstoproshivny or laminated fabric, stitched ribbon from textile industry waste or woven fabrics of the chemical fibers in the normative documentation.

By agreement between the consumer and the manufacturer, the wire does not pack.

Wire that is sent to the far North and remote areas, Packed in accordance with GOST 15846.

(Changed edition, Rev. N 1, 2, 3).

5.2. Coils of wire of the same diameter and of the same type can be connected in parcels.

5.3. Coil’s weight or Bay must not exceed 80 kg.

With the consent of the consumer allowed the increased weight of a coil or Bay.

The formation of packages in the transport packet is performed according to GOST 21650, GOST 24597 and goods transportation regulations approved by the relevant departments.

(Changed edition, Rev. N 1, 2, 3).

5.4. To each of the coils of wire shall be securely attached a label, which indicate:

trademark or the name and trademark of manufacturer;

the symbol wire.

(Changed edition, Rev. N 1,2).

5.5. (Deleted, Rev. N 2).

5.6. Wire transporterowych by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.

The placement and fastening of cargo in rail vehicles must comply with the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

Transportation of the wire rail made in small or carload shipments.

Allowed the transport of wire in universal containers according to GOST 15102,20435 GOST, GOST 22225.

(Changed edition, Rev. N 3).

5.7. Storage of wire shall be in accordance with the requirements of GOST 15150, storage conditions 5.

(Changed edition, Rev. N 2).

5.8. Transport marking under GOST 14192.

(Added, Rev. N 2).

ANNEX 1 (reference). Maximum permissible electric resistance of 1 m copper wire

ANNEX 1
Reference

Maximum permissible electric resistance of 1 m copper wire
(no more of 0.146 Ohms·mm/m)

ANNEX 2 (informative). Maximum permissible electric resistance of 1 m and an ordinary copper wire

ANNEX 2
Reference

Maximum permissible electric resistance of 1 m of ordinary
and copper wire (not more than 0,138 Ohm·mm/m)

APPENDIX 2. (Changed edition, Rev. N 3).

APPENDIX 3 (reference). Maximum permissible electric resistance of 1 m of ordinary wire

APPENDIX 3
Reference

Maximum permissible electric resistance of 1 m of ordinary
wire (not more than 0,130 Ohm·mm/m)

APPENDIX 3. (Added, Rev. N 3).