ISO 4680:2022 PDF

Corrosion of metals and alloys — Uniaxial constant-load test method for evaluating susceptibility of metals and alloys to stress corrosion cracking in high-purity water at high temperatures

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Title (English):

ISO 4680:2022

Corrosion of metals and alloys — Uniaxial constant-load test method for evaluating susceptibility of metals and alloys to stress corrosion cracking in high-purity water at high temperatures

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 27
Publication date:: December 19, 2022
Edition:: ISO IS 4680 edition 1 version 1
ICS:: 77.060

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Description (English):

The document specifies a method for undertaking uniaxial constant load testing of the susceptibility of a metal, or an alloy, to stress corrosion cracking (SCC) in high-purity water environments at high temperature (above the boiling point of water at normal pressures) and pressure. The test method is particularly applicable to simulated primary water environments of light water reactors (LWRs). The test method enables assessment of the relative resistance to SCC of a material in different environments and the comparative resistance of different materials (using the same environment, specimen dimensions and loading). The terms “metal” and “alloy”, as used in the document, include weld metals and weld heat affected zones.

Technical details

Technical committee: ISO/TC 156 - Corrosion of metals and alloys
SKU: ISO 4680:2022

Abstract

Overview

ISO 4680:2022 - Corrosion of metals and alloys - Uniaxial constant-load test method - defines a laboratory procedure to evaluate the susceptibility of metals and alloys to stress corrosion cracking (SCC) in high‑purity water at high temperatures. The method is tailored for simulated primary water environments of light water reactors (LWRs) and specifies uniaxial constant‑load testing under controlled chemistry, temperature and pressure (temperatures above the boiling point of water at normal pressures). The standard covers specimen design, test apparatus (autoclave, loading mechanism, circulating loop), monitoring methods and test reporting.

Key topics and technical requirements

Test principle: apply a constant uniaxial load to specimens in a controlled high‑purity water environment and evaluate SCC by time‑to‑initiation, time‑to‑failure, extent of cracking or electrical resistance changes.
Specimens: guidance on specimen categories, shapes (rod, plate, tubular), orientation, surface finishing, machined notches and weld/weld heat‑affected zones.
Test apparatus: requirements for loading fixtures, autoclaves, circulating loops and instrumentation for corrosion potential and temperature control.
Environment control & measurement: protocols for water chemistry, corrosion potential monitoring and measurement parameters; annexes provide examples for BWR and PWR primary water chemistries.
Accelerated testing: permitted accelerating factors (without changing crack mechanism) and examples - e.g., addition of sodium sulfate (Na2SO4) or crevice formation for simulated BWR environments, and elevated temperature for simulated PWR environments.
Monitoring & evaluation: in‑situ electrical resistance methods, crack morphology observation, validity of failure location and other evaluation indices.
Safety & reporting: safety warning for hazardous operations and a detailed test‑report checklist (see informative annexes).

Practical applications and users

ISO 4680:2022 is intended for:

Corrosion and materials engineers conducting SCC susceptibility testing and materials selection for nuclear and high‑temperature water systems.
Nuclear industry laboratories validating components and materials for LWR primary systems (BWR/PWR).
R&D organizations and failure analysis teams assessing comparative SCC resistance of alloys, weld metals and heat‑affected zones.
Regulators and plant operators specifying qualification tests and interpreting accelerated SCC data for life‑assessment.

Use cases include material qualification, comparative screening of alloys, investigation of SCC initiation mechanisms, and validation of mitigation measures.

Related standards

ISO 7539‑1, ISO 7539‑4 (stress corrosion testing guidance and specimen preparation)
ISO 8044 (corrosion vocabulary)
ISO 3785 (test specimen axes designation)
ISO 6892‑1 (tensile testing at room temperature)

Keywords: ISO 4680:2022, stress corrosion cracking, SCC testing, uniaxial constant‑load, high‑purity water, LWR, PWR, BWR, autoclave, accelerated testing, Na2SO4, crevice, materials testing.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Test principle: apply a constant uniaxial load to specimens in a controlled high‑purity water environment and evaluate SCC by time‑to‑initiation, time‑to‑failure, extent of cracking or electrical resistance changes.
Specimens: guidance on specimen categories, shapes (rod, plate, tubular), orientation, surface finishing, machined notches and weld/weld heat‑affected zones.
Test apparatus: requirements for loading fixtures, autoclaves, circulating loops and instrumentation for corrosion potential and temperature control.
Environment control & measurement: protocols for water chemistry, corrosion potential monitoring and measurement parameters; annexes provide examples for BWR and PWR primary water chemistries.
Accelerated testing: permitted accelerating factors (without changing crack mechanism) and examples - e.g., addition of sodium sulfate (Na2SO4) or crevice formation for simulated BWR environments, and elevated temperature for simulated PWR environments.
Monitoring & evaluation: in‑situ electrical resistance methods, crack morphology observation, validity of failure location and other evaluation indices.
Safety & reporting: safety warning for hazardous operations and a detailed test‑report checklist (see informative annexes).

Practical applications and users

ISO 4680:2022 is intended for:

Corrosion and materials engineers conducting SCC susceptibility testing and materials selection for nuclear and high‑temperature water systems.
Nuclear industry laboratories validating components and materials for LWR primary systems (BWR/PWR).
R&D organizations and failure analysis teams assessing comparative SCC resistance of alloys, weld metals and heat‑affected zones.
Regulators and plant operators specifying qualification tests and interpreting accelerated SCC data for life‑assessment.

Use cases include material qualification, comparative screening of alloys, investigation of SCC initiation mechanisms, and validation of mitigation measures.

Related standards

ISO 7539‑1, ISO 7539‑4 (stress corrosion testing guidance and specimen preparation)
ISO 8044 (corrosion vocabulary)
ISO 3785 (test specimen axes designation)
ISO 6892‑1 (tensile testing at room temperature)

Keywords: ISO 4680:2022, stress corrosion cracking, SCC testing, uniaxial constant‑load, high‑purity water, LWR, PWR, BWR, autoclave, accelerated testing, Na2SO4, crevice, materials testing.

ISO 4680:2022 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Corrosion of metals and alloys - Stress corrosion testing - Part 10: Reverse U-bend method (ISO 7539-10:2020)

Corrosion of metals and alloys. Stress corrosion testing - Preparation and use of uniaxially loaded tension s…

Corrosion of metals and alloys - Vocabulary (ISO 8044:2024)

Metallic materials - Designation of test specimen axes in relation to product texture (ISO 3785:2023)

Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1:2019)