GOST R ISO 2566-1-2009

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  ГОСТ Р ИСО 2566-1-2009

GOST R ISO 2566−1-2009 Steel. Translation of values of relative elongation. Part 1. Steel carbon and low alloy

GOST R ISO 2566−1-2009

Group B09

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

Steel

THE TRANSLATION OF THE VALUES OF THE ELONGATION

Part 1

STEEL CARBON AND LOW ALLOY

Steel. Conversion of elongation values. Part 1. Carbon and low alloy steel

OKS 77.040.10
AXTU 0709

Date of introduction 2010−06−01

Preface

The objectives and principles of standardization in the Russian Federation established by the Federal law of 27 December 2002 N 184-FZ «On technical regulation», and rules for the application of national standards of the Russian Federation — GOST R 1.0−2004 «Standardization in the Russian Federation. The main provisions"

Data on standard

1 PREPARED AND SUBMITTED by the Technical Committee for standardization TC 145 «monitoring Methods of steel products» based on the authentic translation of the standard referred to in paragraph 3, is FSUE «STANDARTINFORM"

2 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology of December 11, 2009 N 732-St

3 this standard is identical with ISO 2566−1:1984 «Steel. Translation of values of relative elongation. Part 1. Steel carbon and low alloy» steels (ISO 2566−1:1984 «Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels»)

4 INTRODUCED FOR THE FIRST TIME


Information about the changes to this standard is published in the annually issued reference index «National standards», and the text changes and amendments — in monthly indexes published information «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in a monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet

1 Scope

This standard specifies the method of translating values of elongation at room temperature after the destruction of the sample obtained on various proportional and non-proportional bases lengths, other lengths of the bases.

The standard applies to carbon, margantsevokisly, molybdenum and chrome-molybdenum steel with a tensile tensile strength from 300 to 700 N/mmin hot rolled and normalized conditions with leave or without it.

Transfer method does not cover are:

a) compressed in a cold condition;

b) quenched and tempered;

c) austenitic.

This transfer method should not be used if the base length exceeds the value of 25 , and if the ratio of the width to the thickness of the test sample exceeds 20.

2 Notation

Symbols used in this standard, are given in table 1.


Table 1

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 base length (gauge length): Any length of the parallel area of the test sample, which is used for measuring strain. This term is used to denote the original length of the base , marked on test specimen for determining elongation after fracture.

3.2 is proportional to the base length (proportional gauge length): the Length of the base, having established the dependence with the square root of the cross section, for example of 5.65 .

3.3 the disproportionate length of the base (non-proportional gauge length): the Length of the base is not connected in some way with the cross-sectional area of the test sample, which has a certain size, for example 50 mm.

4 the Basic formula

The data of this standard is based on the formula of Oliver, which is now widely used for relative translation elongation.

Oliver the formula represent the following equation

, (1)

where is the required elongation on the length of the base ;

the elongation on the length of the base 4.

Using the formula (1) can be translated relative elongation on the length of the base 4to the equivalent value of elongation for the test sample with the cross-sectional area and length of the base . For the length of the base, is equal to 5.65, the formula takes the following form

, (2)

where the elongation on the length of the base is equal to 5,65.

By the formula (2) calculated values of tables 2−22 and figures 1−5.

5 Translation from one is proportional to the length of the base to another is proportional to the length of the base

For translation relative elongation use the multiplication factor determined by the formula (1). Table 2 shows ratios for some of the most widely used proportional lengths of the samples.

A detailed translation of the relative elongation obtained on the length of the base 4, in lengthening the length of the base of 5.65given in table 6.

6 Translation from the same disproportionate length of the base of the other disproportionate the length of the base for the test specimens with the same cross-sectional area

The translation of the relative elongation values of different fixed lengths bases on test specimens with the same cross-sectional area was also carried out using the coefficients. Conversion factors for lengths of bases 50, 80, 100 and 200 mm are shown in table 3.

7 Translation from the proportional length of the base of the disproportionate length of the base

The conversion factors to change in accordance with the cross-sectional area disproportionate test sample.

Table 4 shows the multiplication factor for translation elongation in the length of the base of 5.65equivalent elongation for constant lengths of the bases equal to 50, 80, 100 and 200 mm, for range of the area of the cross section. For transfers in reverse order, i.e. elongation at the constant length of the base in the equivalent elongation on 5,65 database, use the inverse values of the coefficients.

Examples:

a) Elongation of 20% on the basis of 5.65is the equivalent of elongation, equal to 20·1,139=22,78% on the basis of test sample width of 25 mm, a thickness of 6 mm and a length of the base is 50 mm (table 4).

b) Elongation of 25% for the specimen with cross section of about 40 x 10 mm and a length of the base is 200 mm, the equivalent elongation value of 25·1/0,796=31,4% on the basis of 5.65(table 4).

From these examples it is evident that the transfers involving other proportional to the length of the bases, can be obtained by prior or subsequent use of the coefficients presented in table 2.

Table 7−10 can be used in order to obtain some of these translations, and tables 15 to 18 to obtain the elongation on a standard base length corresponding to the length of the base of 5.65.

In the same way table 11 to 14 are used to transfer base 4, and table 19−22 for the relative elongation in fixed lengths of bases in the corresponding lengthening on the base 4.

8 Transfer from disproportionate length of the base of the other disproportionate length of the base is to test specimens with different cross-sectional area

These calculations are preferably performed in two stages with the initial transfer to the base of 5.65.

Example — Relative elongation, equal to 24% for the test sample with the database of 200 mm and a cross-section 40х15 mm, transferred to the elongation of the test sample with a cross section of 30х10 mm and lengths of bases equal to 200, 100 and 50 mm.

24·1/0,863=27,8% — for the base of 5.65(table 4).

27,8·0,752=20,9% — for sample with a cross section of 30х10 mm and a length of the base is 200 mm.

27,8·0,992=27.6 per cent for the sample with cross-section 30х10 mm and a base length of 100 mm.

27,8·1,309=36.4% for the sample with a cross section of 30х10 mm and a length of the base is 50 mm.

Elongation proportional for other lengths of the bases can be obtained using the coefficients presented in table 2.

9 the Use of figures 1−5

9.1 Figures 1−5 can be used as an alternative method to accelerate the translation of relative elongation.

9.2 Figures 1−4 can be used for transfers between the lengths of the bases of 5.65and 50 mm; of 5.65and 200 mm; 4and 50 mm, and 4and 200 mm, respectively.

Example — Find the elongation on the basis of 5.65and 4equivalent to the elongation of 21% on the length of the base is 200 mm test specimen 25х12,5 mm cross-sectional area 312,5 mm.

The intersection of the ordinate corresponding to the area 312,5 mm, with the abscissa representing an elongation of 21% when the length of the base is 200 mm, lies on the sloping line represents the elongation of 28% on the length of the base of 5.65figure 2, and the position of the intersection relative to the sloping lines in figure 4 corresponds to a lengthening of 32.2 on the length of the base 4.

9.3 figure 5 can be used for the calculation of all translation elongation.

The Oliver’s formula can be applied in the following form

, (3)

where and  — coefficients of proportionality for any two test specimens:

; (4)

. (5)

Figure 5 shows the values .

To use figure 5 it is necessary to perform the following operations:

a) calculate values of coefficients of proportionality and for the two test specimens;

b) find the coefficient according to the schedule ;

c) the extension is defined as .


Table 2 — conversion Factors for the proportional lengths of the bases

Table 3 — conversion Factorsfor disproportionate lengths of the bases

Table 4 — conversion Factors from the length of the base of 5.65disproportionate to the length of the base

The values of the coefficients in the column «Coefficient for elongation at disproportionate length of the base» is calculated according to the formula

. (6)

To convert from values on the length of the base of 5.65to the values of the elongation at disproportionate length of the base, multiply them by the corresponding factor.

For the transition from the values for the disproportionate length of the base values of the base length of 5.65separate them by the corresponding factor (figures 1 and 2).