DIN EN ISO 7539-6 2018-12 PDF

Full title and description

STB DIN EN ISO 7539-6:2018-12 — Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of compact tensile specimens (ISO 7539-6:2016, modified)

Abstract

This document specifies procedures for preparing, mounting and using compact tensile specimens for stress corrosion testing of metallic materials. It gives guidance on specimen dimensions, surface finish, pre-cracking or notch creation where relevant, test-piece marking and the application of tensile load during exposure. The part is intended to ensure reproducible test conditions for evaluating susceptibility of metallic materials to stress-corrosion cracking under controlled laboratory conditions.

General information

• Status: Published / current technical standard
• Publication date: December 2018
• Publisher: DIN (German Institute for Standardization) / adoption of EN ISO text
• ICS / categories: 71.040 (Corrosion of metals) / 03.120.10 (Metallurgy)
• Edition / version: Edition incorporating ISO 7539-6:2016; national adoption as DIN EN ISO 7539-6:2018-12
• Number of pages: Typically 10–20 pages (national adoptions of ISO parts commonly in this range)

Scope

This part of ISO 7539 specifies the preparation and use of compact tensile (CT) specimens for stress corrosion testing of metallic materials. It covers geometry and dimensions of CT specimens, requirements for surface condition and notches/pre-cracks where applicable, clamping and gripping arrangements, and recommended practices for applying and maintaining tensile load during exposure to corrosive environments. The document is intended for laboratory testing to assess susceptibility to stress-corrosion cracking; it does not specify the test environment, exposure media or acceptance criteria, which are given in other parts or specific test methods.

Key topics and requirements

• Definition of compact tensile specimen geometry and dimensional tolerances.
• Requirements for surface finish, machining marks and specimen cleaning prior to testing.
• Instructions for producing notches or fatigue pre-cracks when required for reproducible crack initiation.
• Specification of marking, orientation and storage of specimens before testing.
• Guidance on fixture design, gripping and load application to ensure pure tensile mode and prevent bending.
• Recommendations for monitoring and controlling applied stress or displacement during exposure.
• Notes on test reproducibility, safety and reporting of results (test parameters, specimen condition, environment).

Typical use and users

Used by materials testing laboratories, corrosion researchers, quality engineers and manufacturers of metallic components to evaluate stress-corrosion cracking susceptibility. Typical users include aerospace, oil & gas, automotive, power generation and petrochemical industry laboratories, as well as academic research groups conducting comparative studies of alloys and corrosion-mitigation measures.

Related standards

Related documents include other parts of ISO 7539 (general guidance and specimen types), national and international standards on stress-corrosion testing procedures, fatigue pre-cracking methods and fracture mechanics testing (for example standards covering specimen machining, test environments, and reporting). Complementary standards addressing corrosion test environments, specimen dismantling and metallographic examination are also relevant.

Keywords

stress corrosion testing; compact tensile specimen; CT specimen; stress-corrosion cracking; SCC; specimen preparation; pre-crack; notch; tensile loading; corrosion testing; metallic materials

FAQ

Q: What is this standard?

A: This is the national adoption (DIN EN ISO) of ISO 7539-6 providing requirements for the preparation and use of compact tensile specimens for stress corrosion testing of metallic materials.

Q: What does it cover?

A: It covers CT specimen geometry, preparation (surface finish, notches or pre-cracks), marking, mounting and guidance on applying tensile loads during exposure to corrosive environments to assess stress-corrosion cracking susceptibility.

Q: Who typically uses it?

A: Materials testing laboratories, corrosion engineers and researchers in industries where SCC is a concern (aerospace, oil & gas, power generation, automotive, petrochemical) and academic laboratories conducting comparative material assessments.

Q: Is it current or superseded?

A: The entry reflects the December 2018 national publication of DIN EN ISO 7539-6 adopting ISO 7539-6:2016. Users should verify with their national body for any newer revisions or corrigenda since publication.

Q: Is it part of a series?

A: Yes. ISO 7539 is a multi-part series addressing stress corrosion testing of metals and alloys; part 6 specifically deals with compact tensile specimens while other parts cover different specimen types and general principles.

Q: What are the key keywords?

A: Compact tensile specimen, CT, stress-corrosion cracking, SCC, specimen preparation, pre-crack, tensile loading, corrosion testing.