IS 17795 : 2025 Metallic Materials - Uniaxial Creep Testing in Tension - Method of Test - (ISO 204 : 2023, MOD)
[Superseding IS 3407 (Part 1) : 1983 and IS 3407 (Part 2) : 1983]
Revised Standard from Last Update.
NATIONAL FOREWORD
This Indian Standard (First Revision) which is a modified adoption of ISO 204 : 2023 'Metallic materials - Uniaxial creep testing in tension - Method of test' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Mechanical Testing of Metals Sectional Committee and approval of the Metallurgical Engineering Division Council.
This standard was first published in 2022. In this revision, the standard is aligned with ISO 204 : 2023 with certain technical modifications as suggested by the sectional committee. The portions given in dotted underlines are the matters not specified in the corresponding international standard. A list of technical modifications is given in National Annex G.
This standard supersedes the standards mentioned below since the requirements of these standards have been covered in this standard:
a) IS 3407 (Part 1) : 1983 - Method for creep testing of steel at elevated temperatures: Part 1 Tensile creep testing; and
b) IS 3407 (Part 2) : 1983 - Method for creep testing of steel at elevated temperatures: Part 2 Tensile creep stress rupture testing.
Creep is the phenomenon exhibited by materials which slowly deform when subjected to loading at elevated temperature. This document is concerned with the method used to measure such material behaviour.
Annexes are included concerning temperature measurement using thermocouples and their calibration, creep testing test pieces with circumferential V and blunt (Bridgman) notches, estimation of measurement uncertainty and methods of extrapolation of creep rupture life.
Except the deviations identified in National Annex G, the remaining text of the ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions and terminologies are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, it should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards the current practice is to use a point (.) as the decimal marker.
In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the edition indicated:
| International Standard | Corresponding Indian Standard | Degree of Equivalence |
| ISO 6892-1 | IS 1608 (Part 1) : 2022/ISO 6892-1 : 2019 - Metallic materials - Tensile testing: Part 1 Method of test at room temperature (fifth revision) | Identical |
| ISO 6892-2 | IS 1608 (Part 2) : 2020/ISO 6892-2 : 2018 - Metallic materials - Tensile testing: Part 2 Method of test at elevated temperature (fourth revision) | Identical |
| ISO 7500-2 | IS 1828 (Part 2) : 2015/ISO 7500-2 : 2006 - Metallic materials - Verification of static uniaxial testing machines: Part 2 Tension creep testing machines - Verification of the applied force (first revision) | Identical |
| ISO 9513 | IS 12872 : 2021/ISO 9513 : 2012 - Metallic materials - Calibration of extensometer systems used in uniaxial testing (second revision) | Identical |
In reporting the result of a test or analysis made in accordance with this standard, it shall be rounded off in accordance with IS 2 : 2022 'Rules for rounding off numerical values (second revision)'.