GOST 9651-84

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  ГОСТ 9651-84

GOST 9651−84 (ISO 783−89) Metals. Methods of tensile tests at elevated temperatures (Change No. 1)

GOST 9651−84
(ISO 783−89)

Group B09

STATE STANDARD OF THE USSR
METALS
Methods of tensile tests at elevated temperatures

Metals. Methods of tension tests at elevated temperatures

AXTU 0909

Date of introduction 1986−01−01

INFORMATION DATA

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

DEVELOPERS

V. I. Matorin, B. M. Ovsyannikov, V. D. Khromov, A. H. Berun, A. V. Minashin, E. J., Petrenko, M. F. Gambus, V. G. Gachelin, A. V. Bogacheva

2. APPROVED AND put INTO EFFECT by decision of the USSR State Committee for standards from 16.07.84 No. 2513

3. REPLACE GOST 9651−73

4. The standard fully complies ST SEV 1194−88 and meets ISO 783−89 in essence the method, testing and processing of results

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. Validity extended until 01.01.96 by the resolution of Gosstandart of the USSR from 11.05.90 No. 1156*
_____________
* Expiration removed by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS No. 11−12, 1994). — Note the CODE.

7. REPRINT (February 1993) with amendment No. 1, approved in may 1990 (IUS 8−90)


This standard specifies methods for static tensile testing of ferrous and nonferrous metals and products from them with nominal diameter or minimum size in cross section is 3.0 mm or more, and for thin sheets and strips of a thickness of 0.5 mm determination at temperatures from 35 to 1200 °C characteristics mechanical properties:

the yield strength of the physical;

the yield strength of the conditioned;

temporary resistance;

relative uniform elongation;

elongation after rupture;

the relative narrowing of the cross section after the break.

The standard does not apply to wire and pipes.

The standard fully complies ST SEV 1194−88, ISO 783−89 in essence the method, testing and processing of results.

Terms used in this standard, and explain to them — in accordance with GOST 1497−84.

(Changed edition, Rev. No. 1).

1. SAMPLING METHOD

1.1. Types and sizes of proportional flat and cylindrical samples are given in Appendix.

If there are indications in the normative-technical documentation for steel allowed the use of proportional samples of other types and sizes.

(Changed edition, Rev. No. 1).

1.2. Requirements for the construction of the samples, their maximum deviations in sizes of the working part, the labeling in accordance with GOST 1497−84.

2. EQUIPMENT

2.1. Equipment — in accordance with GOST 1497−84 with additions.

2.1.1. Workspace testing machines should allow you to install a heating device with extension rods for mounting samples, which should provide a reliable centering of the specimen in the grips of the testing machine.

2.1.2. The heating device must provide a uniform heating of the sample by its working part to a predetermined test temperature and maintain this temperature within the limits of deviation specified in clause 4.2 of this standard throughout the test.

2.1.3. Primary thermoelectric converters (thermocouples) must meet the requirements of GOST 3044−84.

(Changed edition, Rev. No. 1).

2.1.4. The regulating and measuring instruments shall comply with the requirements of GOST 7164−78, 9245−79 GOST, GOST 9736−91 and have an accuracy class not less than 0.5.

3. PREPARATIONS FOR THE TEST

3.1. Measurement of specimen dimensions, the definition of the initial cross sectional area , the establishment, application and measurement of the initial effective lengths  — according to GOST 1497−84.

3.2. To measure the temperature on the sample set:

two primary thermocouple (thermocouple) — 100 mm (label, bounding the estimated initial length of the sample );

three primary thermocouple (thermocouple) — 100 mm (label, bounding the estimated initial length of the sample and in the middle of it).

With the exception of differences in the assessment of the quality of the metal is allowed to set on the sample with an initial estimated length of 50 mm one primary thermocouple (thermocouple) in the middle part of the estimated initial length of the specimen .

3.3. The working end of the primary thermocouple (thermocouple) must have reliable contact with the sample surface and be isolated from the radiant heating.

4. TESTING

4.1. Sample in the heating device and heated to a predetermined temperature, after the set time of aging test.

4.2. Maximum deviations from the established test temperature at the measuring points along the length of the design portion of the sample without taking into account the errors of temperature measurement caused by the thermoelectric Converter and the secondary devices must not exceed:

±5 °C — when the test temperature to 600 °C;

±7 °C — the test temperature in excess of 600 to 900 °C;

±8 °C — when the test temperature in excess of 900 to 1200 °C.

The differences in the assessment of the quality of the metal limits the temperature deviation from the set when tested at any point the calculated length of a specimen should be about 2 °C below.

Permitted maximum deviation from set temperature:

±3 °C — when the test temperature to 600 °C;

±4 °C — when the test temperature in excess of 600 to 800 °C;

±5 °C — for temperature tests in excess of 800 to 1000 °C.

(Changed edition, Rev. No. 1).

4.3. The heating time of the specimen to the test temperature and soaking time at this temperature are specified in normative and technical documentation for metal products. In the absence of such instructions, the duration of heating to the test temperature shall be not more than 1 h, the holding time is 20 to 30 min.

4.4. If there are indications in the normative-technical documentation for metal products is permitted to carry out tests in a protective (neutral gases) atmosphere.

The heating time of the specimen to the test temperature in a protective atmosphere and holding times are specified in normative and technical documentation for metal products.

4.5. Other requirements for the testing, processing the results — according to GOST 1497−84.

To specify the test temperature to the determined marking characteristics of the mechanical properties add the corresponding numeric index.

Example: , , ,  — the yield strength conditional with the tolerance on the amount of residual deformation of 0.2%, tensile strength, elongation after rupture of the sample , the relative narrowing of the cross section after rupture, defined at the test temperature of 450 °C.

APPLICATION (recommended). PROPORTIONAL FLAT (damn.1) AND CYLINDRICAL (Fig.2, 3) SAMPLES

APP
Recommended

PROPORTIONAL FLAT SAMPLES

Damn.1

Table 1

mm

PROPORTIONAL CYLINDRICAL SPECIMENS

Type 1

Damn.2

Table 2

(Changed edition, Rev. No. 1).

Type II

Damn.3

The text of the document is verified by:
the official publication of the
M.: standards Publishing house, 1993