ENV 22605-2:1991

SLOVENSKI STANDARD
SIST ENV 22605-2:1997
01-maj-1997
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Steel products for pressure purposes - Derivation and verification of elevated
temperature properties - Part 2: Proof stress of austenitic steel products (ISO 2605-
2:1976)
Stahlerzeugnisse für die Anwendung bei Druck - Ableitung und Prüfung von
Eigenschaften bei erhöhter Temperatur - Teil 2: Dehngrenze von austenitischen
Stahlerzeugnissen (ISO 2605-2:1976)
Produits en acier pour récipients a pression - Dérivation et vérification des valeurs a
température élevée - Partie 2: Limite conventionelle d'élasticité des produits en acier
austénitique (ISO 2605-2:1976)
Ta slovenski standard je istoveten z: ENV 22605-2:1991
ICS:
77.140.30 Jekla za uporabo pod tlakom Steels for pressure purposes
SIST ENV 22605-2:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ENV 22605-2:1997

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SIST ENV 22605-2:1997

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SIST ENV 22605-2:1997

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SIST ENV 22605-2:1997
INTERNATIONAL STANDARD
2605lll
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEX~YHAPOfiHA(I OPl-AHM3ALWl I-IO CTAHAAPTM3ALW-i *ORGANISATION INTERNATIONALE DE NORMALISATION
Steel products for pressure purposes - Derivation and
verification of elevated temperature properties -
Part II : Proof stress of austenitic steel products
Produits en acier pour rbcipients 2 Pression - Dkivation et vhification des valeurs 2 tempkature &lev&e -
Partie // : Limite conven tionnele d’elasticite’ des produits en acier austhitique
First edition - 1976-10-15
U DC 669.14.018.452 : 620.172.224.4 Ref. No. ISO 2605/11-1976 (E)
Descriptors : iron and steel products, pressure vessels, austenitic steels, high-temperature tests, elastic limit, verifying.
Price based on 7 pages

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SIST ENV 22605-2:1997
FOREWORD
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO Member Bodies). The work of developing
International Standards is carried out through ISO Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in Iiaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the ISO Council.
International Standard ISO 2605/1 I was drawn up by Technical Committee
ISO/TC 17, Steel, and was circulated to the Member Bodies in February 1975.
lt has been approved by the Member Bodies of the following countries :
Austria Iran Spain
Bulgaria I reland Sweden
Mexico Switzerland
Czechoslovakia
Denmark Netherlands Turkey
Finland Norway United Kingdom
Germany Poland U.S.S. R.
Hungary Romania Yugoslavia
I ndia South Africa, Rep. of
The Member Bodies of the following countries expressed disapproval of the
document on technical grounds :
Australia Canada Japan
Belgium France U.S.A.
0 International Organkation for Standardkation, 1976 l
Printed in Switzerland

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SIST ENV 22605-2:1997
INTERNATIONAL STANDARD ISO 2605/1 I-l976 (E)
Steel products for pressure purposes - Derivation and
verification of elevated temperature properties -
Part II : Proof stress of austenitic steel products
0 INTRODUCTION REFERENCES IN INTRODUCTION
ISO 82, Steel - Tensile testing.
In the ISO rules for the construction of stationary boilers
ISO 375, Steel- Tensile tes ting o f tubes.
(lSO/R 831) and the draft rules for the construction of
ISO/R 783, Mechanical testing of steel at elevated temperatures -
unfired pressure vessels, minimum Iower yield or proof
Determination of lower yield stress and proof stress and proving
stress at elevated temperature is listed as one of the design
tes t.
criteria. Accordingly, International Standards for pressure
ISO/R 831, Rules for construction of stationary boilers.
vessel steels, or national Standards or specifications
conforming to the above rules, should specify lower yield
or proof stress properties at elevated temperature.
1 SCOPE AND FIELD OF APPLICATION
International Standards for austenitic pressure vessel
This International Standard defines :
steels will normally give specified elevated temperature
-
a method for deriving minimum elevated tempera-
proof stress values, for example 0,2 or 1,O %, which are
ture proof stress values for inclusion in International
derived statistically from a body of data. In all such cases
Standards for austenitic steel products for pressure
the manufacturer may satisfy the customer that the
pu rposes;’ )
product supplied consistently meets the properties by
either :
-
a verification procedure which may be used by a
manufacturer as an alternative to hot-testing for
a) hot-testing the product, or
satisfying the purchaser that his product consistently
meets the specified minimum elevated temperature
b) producing a body of data on the product.
proof stress values in such specifications.
This International Standard has been prepared in Order to
implement the alternative procedure using a body of data.
2 PROCEDURE ‘FOR DERIVING MINIMUM PROP-
lt also defines the method by which the minimum elevated
ERTIES
temperature proof stress values to be included in Inter-
national Standards for austenitic pressure vessel steels
2.1 Basis of method
should be derived.
2.1.1 The elevated temperature proof stress properties
NOTES
are derived from a weil-defined body of data on the basis
1 Whilst the validity of the derivation procedure has been of a linear regression analysis of the elevated proof stress
examined in relation to data for a variety of steels, future
values against the room temperature proof stress values at
experience indicate that modifications are desirable,
mw
the same offset, at each of a number of temperatures.
particularly in relation to the minimum quantity and distribution
of data required by the derivation and verification procedures.
2.1.2 For the purpose of this International Standard, the
2 All tests used to implement this procedure either at room
specified minimum proof stress value (Et) at a given
temperature or at elevated temperature shall be carried out in
temperature is defined as the proof stress derived from the
conformity with the appropriate ISO documents (for example
lower 95 % confidence level at a room temperature proof
ISO 82, ISO 375, at room temperature, and ISO/R 783 at elevated
stress 20 N/mm* above the specified minimum room
temperatures). However, data previously obtained using other test
methods may be used for an interim period. temperature proof stress.
1) Application to national Standards :
If a country adopts in its national Standard an ISO steel together with the properties specified in International Standards for this steel (or
properties derived in accordance with this International Standard from the agreed regression lines), then it is not necessary for the country to
separately apply the derivation procedure.
If a country specifies non-ISO steels for use in compliance with ISO boiler and pressure vessel design Codes, the procedures as given in ISO . . .,
Steel products for pressure purposes - Derivation and verification of elevated temperature properties - Part. . . : Derivation of yield or proof
stress from limited data, (in preparation) shall apply.
1

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SIST ENV 22605-2:1997
ISO 2605/1 I-l976 (E)
2.2 Basis requirements 2.5.2 The values so obtained shall then be plotted as a
function of temperature and a family of curves for different
2.2.1 The method shall be applied separately for each
room temperature proof stress levels constructed. If the
product form, thickness range, section size range or heat-
values obtained in accordance with 2.5.1 do not produce
treatment condition for which elevated temperature proof
smooth curves, then conservative curves shall be drawn
stress properties are to be specified in the relevant
through the majority of the Points at each room
International Standard, unless it tan be shown that the data
temperature proof stress level (see figure 2).
being considered belong to the same population.
2.5.3 A further elevated temperature proof stress/room
2.2.2 The data utilized shall be obtained using test samples
temperature proof stress graph shall then be constructed
which :
plotting the 95 % Iower confidence limit value at each of a
number of temperatures, the values being read off the proof
a) are representative of the product form, thickness or
stress/temperature curves prepared in accordance
section size range and heat treatment to which the ’
with 2.5.2.
specified properties apply;
A smooth family of 95 % lower confidence limit curves
b) provide room temperature proof stress values fairly
shall be constructed through these Points (see figure 3), and
uniformly distributed over a range of not less than
the specification minima as defined in 2.1.2 read fro
...