GOST 8803-89

• gost-8803-89.pdf (403.62 KiB)
  ГОСТ 8803-89

GOST 8803−89 round Wire of precision alloys with high electrical resistance for the thinnest of resistive elements. Specifications (with Change No. 1)

GOST 8803−89
Group В73

INTERSTATE STANDARD
ROUND WIRE OF PRECISION ALLOYS WITH HIGH
ELECTRIC RESISTANCE FINEST
FOR RESISTIVE ELEMENTS

Specifications
High electric resistance precision alloys minimum diameter round wire for resistors.
Specifications

ISS 77.140.65
OKP 12 2600

Date of introduction 1991−01−01

INFORMATION DATA

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

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 09.06.89 N 1515

3. REPLACE GOST 8803−77

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. By the resolution of Gosstandard dated 08.07.92 N 663 the restriction of validity period

6. EDITION with Change No. 1, approved in July 1992 (IUS 9−92)


This standard applies to the thinnest round wire alloy with high electrical resistance for the manufacture of resistive elements in devices.

The standard does not apply to the wire alloy with high electrical resistance for the manufacture of heaters.

1. TECHNICAL REQUIREMENTS

1.1. Wire shall be manufactured in accordance with the requirements of this standard.

1.1.1. Wire classification:

at sight surface:

bright,

oxidized — 0;

temperature coefficient of electrical resistance in groups A and b;

for permissible deviation of electric resistance of 1 m wire into classes: 1, 2, 3;

weight of wire on bobbin:

high — B

high — P,

normal;

use:

for enameled wire — e,

for wires without enameling.

1.2. Basic parameters and dimensions

1.2.1. Wire depending on the brand of alloy is manufactured with the diameters specified in the table.1.

Table 1

Note. Wire of alloy grade EP 277-V, and the wire diameter is 0.011 mm all brands not recommended for new designs.

1.2.2. Limit deviations of the diameter of the wire CR20NI80 alloy-VI intended for enameled wire, should correspond to GOST 2771квалитетам:

for diameters from 0.020 mm to 0.040 mm incl. — 5; 6;

for diameter of 0.050 mm — 6;

(Changed edition, Rev. N 1).

1.2.3. For a wire diameter of 0.020 mm and more from the alloy grade CR20NI80-VI intended for enameled wire, diameter of the helix formed by the free length of wire must be at least 40 mm.

1.2.4. Ovality of wire with a diameter of 0.1 mm or more from the alloy grade CR20NI80-VI intended for enameled wire must not exceed half of the limit deviation for diameter.

Example of designation of wire diameter, 0,100 mm from the alloy grade CR20NI80-VI, 2nd class, with a bright surface with increased weight on the reel for enameled wire:

Wire 0,100−2-P-e-CR20NI80-VI GOST 8803−89.

1.2.3, 1.2.4. (Changed edition, Rev. N 1).

1.3. Features

1.3.1. Wire produced from the alloys CR20NI80, H15N60, CR20NI80-VI, N80KHJUD-VI with the chemical composition according to GOST 10994 and alloy grade EP 277-VI according to normative-technical documentation.

1.3.2. Wire produced in the heat-treated condition.

1.3.3. The surface of the light wires should be clean, free of oxides and grease. Wire alloys N80KHJUD-VI and EP 277-VI allowed a light gray color surface.

The oxidized surface of the wire can be dark and with colors of tint.

1.3.4. The nominal electrical resistance of 1 m wire must conform to the requirements given in table.2.

Table 2

(Changed edition, Rev. N 1).

1.3.5. The permissible deviation of electric resistance of 1 m wire must meet the requirements given in table.3.

Table 3

Note. Wire of the third class is made from the alloy grade CR20NI80-VI intended for enameled wire high mass.

1.3.6. Temperature coefficient of electrical resistance wire alloy N80KHJUD-VI in a stable condition and wire of alloy EP 227-VI in the hardened state shall conform to the requirements given in table.4.

Table 4

Note. By agreement between the consumer and the manufacturer wire of alloy grade N80KHJUD-VI are made with a resolution of TKS at 5·10To.

1.3.7. Elongation of wire shall conform to the requirements given in table.5.

Table 5

1.3.8. Weight of wire on the spool should meet the requirements given in table.6.

Table 6

Notes:

1. Wire for enamelled wires produce only high or high mass.

2. Wire of the third class produce only high mass.

3. The increased weight of wire of alloy grade N80KHJUD-VI diameter 0,320−0,400 mm should be not less than 1800

1.3.9. Electrical resistivity, the wire diameter is 0.020 mm or more, in addition to the wire for enamelled wires shall conform to the requirements given in table.7.

Table 7

Note. Rules with a «*" are not a symptom of rejection to 01.01.95. The determination required for the accumulation of statistical data.


(Changed edition, Rev. N 1).

1.3.10. Physical and electrical properties of alloys is given in Appendix 2.

1.4. Marking

1.4.1. Each coil shall be attached a label showing:

the name and trademark, or trademark of the manufacturer;

legend wire;

the actual electrical resistance of each segment of wire on the reel;

temperature coefficient of electrical resistance for alloys that are controlled by this parameter;

stamp of technical control or personal stigma.

1.4.2. Transport marking under GOST 14192. The container should be handling marks «Fragile. Caution» and «Keep away from moisture» according to GOST 14192.

1.5. Packaging

1.5.1. The wire should be coiled without kinks on the coil tight separatornyi rows, providing free spooling of the reel. The reel needs to be a single length of wire.

1.5.2. The wire on the coils should be wrapped in paper stamps ODP-35 according to GOST 16711или other paper for NTD and tightly Packed in wooden boxes according to GOST 18617 or other containers (metal, plastic) according to normative-technical documentation, inside lined with waterproof paper according to GOST 8828 or paraffined paper GOST 9569.

Between the layers of coils are laid cardboard according to GOST 7376 or another NTD.

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

1.5.3. When transporting multiple packaging ground wire to one of the consumer enlarged cargo space in bags according to GOST 24597, GOST 21650.

1.5.4. Weight of cargo space — not more than 1250 kg.

1.5.5. Allowed in one package, several parties, drawn up by one document on quality.

2. ACCEPTANCE

2.1. Wire take parties. The party should consist of wire of the same nominal diameter, one bottoms, one mode of heat treatment and must be issued a document about quality that contains:

trademark or the name and trademark of manufacturer;

symbol wire;

the weight of the party;

the results of the tests;

the chemical composition of the alloy;

the melting number.

Note. To 01.01.95 test results of the electrical resistivity in the document about quality not indicate.


(Changed edition, Rev. N 1).

2.2. To check the quality of wire taken from the party:

diameter control, diameter of the helix, the surface electrical resistance of 1 m wire, ground wire on the coil — 100% of the coils;

to control the temperature coefficient of electrical resistance, resistivity — 0,5% of the coils, but not less than three; the party, consisting of one or two coils — 100% of the coils;

to control the elongation of the wire is 2% of the coils, but not less than three coils; the party, consisting of one or two coils — 100% of the coils;

to check the chemical composition — one sample from melting.

2.3. The chemical composition of the alloys shall be certified on the document about the quality of the enterprise, smelting metal.

2.4. If unsatisfactory test results, re-testing is carried out in accordance with GOST 7566.

3. CONTROL METHODS

3.1. The wire diameter is determined by measuring the electrical resistance of 1 m wire.

The wire diameter corresponds to the nominal, if the resistance of 1 m wire meets the requirements of table.2 and 3.

The actual diameter of the wire to determine the maximum deviation is measured in at least two mutually perpendicular directions of the three sections of the segment wire length of 1 m from the outer end of the coil with a micrometer table with a needle indicating device with a scale division of not more than 0.001 mm in NTD or other tool to ensure the required accuracy.

3.2. Sampling for chemical analysis is carried out according to GOST 7565.

Chemical composition of alloys determined according to GOST 28473, 12344 GOST-GOST 12357 or other methods providing the required accuracy.

3.3. The surface condition is checked visually on the outer layer of wire wound on a spool. In doubtful cases the wire is inspected at magnification 25.

3.4. To check the electrical resistance of 1 m wire temperature coefficient of resistance and relative elongation of each selected coil take one sample at a distance of not less than 1 m from the outer end of the coil.

3.5. Electrical resistivity (, μω·m) is calculated according to the formula

,

where  — electrical resistance of a wire, Ohm;

 — the area of cross section, m;

 — length of sample, m

Determination of electrical resistance of 1 m wire is carried out according to GOST 7229 with the use of instruments of accuracy class of 0.05, the sample length less than 250 mm.

3.6. Determination of temperature coefficient of resistance of wire should be carried out according to the method given in Appendix 3. Wire of alloy grade EP 227-VI experience in the delivery condition. Tested in temperature ranges from -60 to +20 °C and from +150 to +300 °C the manufacturer does not hold.

3.7. The diameter of the helix is determined by measurement with a ruler (GOST 427) the minimum diameter of the ring formed at the free down on the horizontal surface of a segment of wire of length 1 m.

3.8. Determination of elongation of wire is carried out according to GOST 10446 on samples with an estimated length of 100 mm.

3.9. Determination of the mass of the wire is carried out on the scales the absolute error for wire diameter:

less than 0,016 mm — 0,01 g;

from 0.016 to 0.025 mm incl. — 0,10 g;

St. 0.025 mm — 1.0 g

4. TRANSPORTATION AND STORAGE

4.1. Wire transporterowych all types of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.

The wire transport by rail is carried out in covered wagons small shipments.

Allowed sending wire postal parcels in accordance with the rules of the Ministry of communications of the USSR.

4.2. Wire should be stored in Packed form in closed premises at temperature from -30° to +50 °C, relative humidity of 95%. Long-term storage (1 month or more) must comply with GOST 15150, storage conditions 1L in the absence of air in alkaline, acidic and other aggressive contaminants.

5. MANUFACTURER’S WARRANTY

The manufacturer guarantees compliance wire requirements of this standard while complying with the storage conditions.

Warranty period of storage — 3 years from date of manufacture.

(Changed edition, Rev. N 1).

6. OPERATING INSTRUCTIONS

Wire the consumer has to be unwound from the spool at a speed of 200 m/min if tensile force is not more than 0.6 breaking strength. Unwinding is not allowed the beating of the coil more than 0.1 mm.

ANNEX 2 (informative). Physical and electrical properties of alloys

ANNEX 2
Reference

Table 8

APPENDIX 1. (Deleted, Rev. N 1).

APPENDIX 3 (obligatory). THE METHOD OF DETERMINING THE TEMPERATURE COEFFICIENT OF ELECTRICAL RESISTANCE

APPENDIX 3
Mandatory

1. Sampling

1.1. Samples taken from the finished product. When the supply of wire in the hardened state, the samples are subjected to a stabilizing heat treatment according to the mode of the manufacturer.

1.2. When using bridges DC electrical resistance of the samples depending on the diameter of the wire shall be as given in table.9.

Table 9

1.3. When measuring electrical resistance with a potentiometer used samples with a length of 0.1−1 M.

2. Equipment and materials

The installation or device for determining the electrical resistance of the sample at a given temperature according to GOST 7229.

Potentiometer DC accuracy class not less than 0.005 according to GOST 9245 to determine the electrical resistance. It is possible to use other devices the same accuracy.

Allowed to 01.01.92 electrical resistance to measure single, dual or single-dual bridge DC accuracy class 0.05 according to GOST 7165.

Thermostat or furnace for variable heat and keeping the sample at a given temperature. The deviation of temperature in the area of the test not more than ±5 °C.

Thermometer to measure the temperature or thermocouple chromel-alumel GOST 3044* with measurement error no more than ±1 °C.
_______________
* On the territory of the Russian Federation GOST R 8.585−2001.

Potentiometer DC class of accuracy not worse than 0.05 for measurements of thermoelectric power of the thermocouple.

3. Preparing for the test

3.1. For the measurement of electrical resistance using the potentiometer of accuracy class 0,005 selected sample of wire is wound on the mandrel, ensuring the absence of inflection with a diameter of less than 3 mm on the sample of insulating material according to GOST 5500.

When using bridges DC accuracy class of 0.05 allowed the test specimen is wound on a standalone disc.

Winding tension should be minimal so as not to create voltage in a wire with changes in temperature, but sufficient to prevent contact between the turns during the test.

When testing a wire diameter less than 0.1 mm is allowed to apply direct samples. The sample in the testing process should not be stretched.

3.2. When determining electrical resistance with a potentiometer to each end of spiral welded sample of two lead wires, made of wire of the same alloy as the sample, or from the alloy grade CR20NI80. Wire diameter lead wire should be close to the diameter of the sample. When testing a wire diameter of 0.10 mm and less than the diameter of the lead wires should be 0.15−0.07 mm.

Welding is carried out in the welding apparatus and to provide a solid reliable contact. Lead wires should be elektroizolyator heat-resistant material.

3.3. The ends of the lead wires or test specimens, cleaned and attached to the measuring circuit.

4. Testing

4.1. The prepared samples in an amount determined by the capabilities of the equipment, placed in the thermostat (or oven) for heating. This should be secured the uniformity of temperature within ±5 °C throughout the working volume of the thermostat.

4.2. Measure the electrical resistance of the sample at room temperature, then the temperature was raised to the predetermined level. The sample is maintained at a predetermined temperature for the time required for thermal equilibrium between the sample and the environment, then record the temperature and again measure the electrical resistance of the sample.

5. Processing of the results

5.1. Temperature coefficient of electrical resistance (To) calculated by the formula

,

where is the difference between the electric resistance of the sample measured at a given temperature and at room temperature, Ohms;

 — the electrical resistance of the sample at room temperature, Ohms;

 — the algebraic difference between the set and room temperature, K.

5.2. Absolute error definition is:

±1,05·10K — potentiometers, DC class of accuracy 0,005;

±5,5·10To the — bridges DC accuracy class of 0.05.

The text of the document is verified by:
the official publication of the
Wire metal. Part 2: Sat. Standards. -
M.: IPK Publishing house of standards, 2003