GOST 10446-80

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  ГОСТ 10446-80

GOST 10446−80 (ISO 6892−84) Wire. Method of tensile test (with Amendments No. 1, 2)

GOST 10446−80
(ISO 6892−84)
Group В79

INTERSTATE STANDARD

WIRE

Test method tensile

Wire. Tensile test method

ISS 77.040.10
77.140.65
AXTU 1209

Date of introduction 1982−07−01

INFORMATION DATA

1. DESIGNED AND MADE with the USSR State Committee for standards

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 03.06.80 N 2515

3. The standard fully complies ST SEV 835−89 and meets ISO 6892−84 in part of wire

4. REPLACE GOST 10446−63

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

7. EDITION with Amendments No. 1, 2 approved in January 1987, may 1990 (IUS 4−87, 8−90)


This standard specifies the test method for static stretching at a temperature of 20°C of wire from metals and their alloys with a diameter or maximum cross-sectional dimension not exceeding 16 mm round, square, and rectangular cross-section and special profile with a ratio of width to thickness not more than 4 with constant cross-sections, and wire periodic profile.

Terms, symbols and definitions — according to GOST 1497.

The standard fully complies ST SEV 835−89 and meets ISO 6892−84 in part of wire.

(Changed edition, Rev. N 2).

1. Sampling methods

1.1. Samples for testing are segments of wire.

1.2. Sampling methods are specified in normative and technical documentation on the wire.

1.3. Working length of the wire specimen shall not be less than (+50) mm.

(Changed edition, Rev. N 2).

1.4. Full length of the sample should include areas to secure it in the clamps of the bursting machine.

1.5. The initial gauge length of the specimen wire with a diameter less than 4 mm, and the wire non-circular cross-section measuring less than 3 mm should be 100 or 200 mm, depending on the requirements of normative-technical documentation for metal products.

For samples with a diameter of not less than 4 mm and for samples of wire of noncircular cross section with a minimum thickness of 3.0 mm initial gauge length should be or, but not less than 25 mm. allowed the use of samples with an initial estimated length of 100 or 200 mm.

(Changed edition, Rev. N 2).

2. Equipment

2.1. Test equipment and measuring instruments — according to GOST 1497.

Allowed to use other measuring devices that provide measurement with an uncertainty not exceeding the specified in paragraph 3.4.

(Changed edition, Rev. N 1).

3. Preparing for the test

3.1. Before the test is allowed to edit samples, which should not influence the state of the surface and cross-sectional shape of the wire.

3.2. The initial design length with accuracy of up to 1% limit on the working length of the sample cores, risk, or other marks.

Calculate the elongation with the assignment open to the middle of the estimated length of the marks applied along the entire working length of the sample intervals. Mark applied in ink, pencil, paint or scratching; applied to scratching the sample wire can be pre-painted quick-drying paints.

3.3. The initial estimated length is measured with an accuracy of ±0.1 mm.

3.2, 3.3. (Changed edition, Rev. N 1).

3.4. The initial cross-sectional area calculated by dimensions.

Round wire with a diameter of 3 mm or flat wire with a minimum thickness of 3 mm is measured with an accuracy of ±0.5%.

When measuring a circular wire with a diameter of less than 3 mm flat wire thickness of less than 3 mm, the measurement error should be not more than 1.0%.

Wire of circular cross-section is measured in two mutually perpendicular directions, the diameter should be the arithmetic mean of these measurements.

Allowed the calculation of the cross sectional area of nominal size, if it is stipulated in the normative-technical documentation for metal products.

(Changed edition, Rev. N 2).

3.5. The cross-sectional area , mm, wire, special profile calculated by the formula

where is the mass of sample, g;

 — total length of the specimen, mm;

 — the density of the sample material, g/cm.

3.6. Rounding the calculated values of the cross sectional area is carried out in accordance with the table.

Note. Rounding , mm, numerical values of the cross section of less than 0.001 mmis carried out according to the formula

where  — wire diameter, mm;

 — a unilateral tolerance on the diameter, set the appropriate standard for wire, mm.

4. Testing

4.1. The sample should be fixed in the grips of the testing machine so that the extreme markers bounding the estimated length, defended from the grips of the machine at a distance of not less than two diameters of the test sample. Grips must ensure that no slippage of the sample during the test.

4.2. Test wire tensile with the definition of the limit of proportionality, elasticity, fluidity and strength is carried out according to the methods GOST 1497, with the following additions.

4.2.1. When determining the limit of proportionality, elasticity, and yield strength of the low level of loading is taken by 20−40 N/mm(2−4 kgf/mm).

4.2.2. In determining the yield point is allowed to set the load on a scale siloizmeritelya and residual deformation on the scale of the strain gauge corresponding to the determined characteristic.

4.3. Elongation of wire after break determined in accordance shost 1497.

The final calculated length of the sample is measured with an accuracy of ±0.1 mm.

To specify an initial estimated length of which was determined by the elongation, the elongation symbol is added by the digital code. For example: or .

(Changed edition, Rev. N 1).

4.4. For wire diameter 1.0 mm and less, depending on the requirements of normative-technical documentation, the following methods of determining the elongation.

4.4.1. The distance between the grips of tensile machine. The sample must be applied initial load =10% of the average breaking strength. Measured with an accuracy of ±1.0 mm.

4.4.2. Without destruction of the sample when load of 97 and 98% of breaking strength to determine the residual elongation.

The procedure of determination of elongation: first two or three samples to determine the average breaking strength of the wire. To the subject sample is applied initial load (=10% of the average breaking strength), and hang a strain gauge or a ruler.

Sample load up to 97% of the average breaking strength and total elongation is noted. Then the sample is unloaded to initial load and take readings of the residual elongation. The operation of loading and razrusheniya repeat for the load component of the 98% of the average breaking strength, after which the sample is brought to destruction, and celebrate the breaking strength of the sample.

If you find that the elongation is determined at a load below 97% of the breaking strength, the test is repeated.

4.5. Determination of the relative constriction after rupture of the round wire is produced in accordance with GOST 1497.

The relative narrowing is related only to a wire having a diameter of 2 mm or more, unless otherwise specified in the relevant normative-technical documentation on the wire.

(Changed edition, Rev. N 1).

4.6. To determine the gap with the sample node to tie a simple knot and gently tighten. Final tightening is done by the application of the load.

5. Processing of the results

5.1. Processing of results of tests for characterization of mechanical properties is carried out in accordance with GOST 1497.

5.2. The gap with the node (), %, is calculated by the formula

where is the rupture strength when testing the wire with the host;

 — breaking strength in the test wire without a knot.

Rounding of the values gap with the node is held to 1%.

The text of the document is verified by:
the official publication of the
Wire metal. Part 3: Sat. Standards. -
M.: IPK Publishing house of standards, 2003