June 2026 Update: New ISO Standard Advances Non-Destructive Testing in Metallurgy

The international metallurgy community has marked a significant milestone this June 2026 with the publication of one crucial new ISO standard. ISO 22500:2026 addresses advanced non-destructive testing, specifically magnetic flux leakage (MFL) testing for assessing the integrity of in-service steel plates and pipes. With a growing demand for rigorous corrosion detection and asset reliability in pressure vessels and storage tanks, this standard brings unified requirements and modern practices for enhanced safety, quality, and regulatory compliance.

Overview / Introduction

The metallurgy sector underpins global infrastructure and industrial processes, relying on robust materials and rigorous quality controls. Standards play a pivotal role in ensuring the structural integrity, operational safety, and longevity of steel products utilized in critical equipment such as pipelines, pressure vessels, and storage tanks.

Non-destructive testing (NDT), and magnetic flux leakage (MFL) testing in particular, has emerged as a frontline methodology for detecting hidden corrosion and mechanical damage. ISO 22500:2026 establishes a comprehensive and harmonized framework for MFL testing, ensuring that companies worldwide can assess steel integrity with confidence and precision.

In this article, industry professionals will find an in-depth analysis of the new standard, key requirements, compliance considerations, and actionable insights to adopt best-in-class practice in metallurgy.

Detailed Standards Coverage

ISO 22500:2026 – Magnetic Flux Leakage Testing for Corrosion Detection

Non-destructive testing — Magnetic flux leakage testing — Corrosion of steel plates and steel pipes of in-service equipment

ISO 22500:2026 provides the first internationally harmonized methodology for using magnetic flux leakage (MFL) to identify and evaluate corrosion and mechanical damage in steel structures that are already in service. This standard targets equipment made of ferromagnetic materials—especially seamless steel pipes, pressure vessel shells, and storage tank bottom plates exposed to demanding operational conditions.

Scope and Applicability

This standard defines:

• The principles of MFL testing for identifying volume defects, such as corrosion or damage on both the test and opposite surfaces of steel plates and tubular components.
• Provisions for MFL inspection through non-conductive coatings up to 6 mm thick.
• Requirements for external MFL testing of seamless steel pipes and pressure vessel shells with external diameters of ≥38 mm and wall thicknesses up to 20 mm.
• Guidance for MFL of pressure vessel bases and storage tank floors with wall thicknesses no greater than 20 mm.

Key Requirements and Specifications

ISO 22500:2026 structures the testing process through:

• Qualification of Test Personnel: Only personnel qualified in MT-FL methods as per ISO 9712 (or equivalent) are permitted to conduct MFL inspections. This ensures foundational knowledge of electromagnetics and industrial safety.
• Equipment Standards: Specifies criteria for magnetization devices, probes, channels (sensors and acquisition units), scanning devices, and display systems. Functional checks, maintenance, and system verification (using reference blocks) are essential parts of compliance.
• Testing Procedure: Outlines mandatory site investigation, adjustment of testing system sensitivity, and scanning modes to capture complete surface and subsurface data. The standard mandates detailed procedural records and test reports for traceability.
• Evaluation and Actions: Sets criteria for evaluating defect signals (using tangential and normal MFL signal components) and recommends necessary follow-up, such as additional inspection, remediation, or documentation.
• Documentation: Requires instruction, recordkeeping, and detailed test reports covering procedures, results, and actions taken.

Practical Implementation

The application of ISO 22500:2026 is vital for organizations operating pressurized systems and storage tanks where undetected corrosion could compromise safety or disrupt operations. By standardizing test methodology, equipment requirements, and personnel qualifications, the standard promotes:

• Unified quality assurance across borders
• Improved failure prediction and asset management
• Enhanced safety in industries such as oil & gas, chemical processing, and water utilities

Key highlights:

• Applies to ferromagnetic steel pipes, pressure vessels, and tank plates in service
• Allows testing through coatings up to 6 mm thick
• Requires personnel certification as per ISO 9712 or equivalent
• Details equipment setup, scanning methods, data evaluation, and required documentation
• Provides guidance on evaluating and responding to detected defects

Access the full standard:View ISO 22500:2026 on iTeh Standards

Industry Impact & Compliance

Adoption of ISO 22500:2026 is poised to benefit metallurgy businesses substantially. The harmonized procedures facilitate:

• Heightened Safety: Proactive corrosion detection reduces the risk of catastrophic failures, environmental incidents, and workplace injuries.
• Regulatory Compliance: Many regulatory bodies increasingly require internationally recognized NDT practices for pressure vessels and pipelines. Using ISO 22500:2026 ensures alignment with auditor expectations.
• Risk Mitigation: Reliable defect identification enables timely repairs, limiting unplanned shutdowns and high-cost asset replacements.
• Quality Management: Standardized procedures enhance cross-border operations, supplier qualification, and audit readiness.

Compliance Considerations

Organizations should plan for:

• Personnel Training & Certification: Ensure all NDT team members have updated certification as stipulated by ISO 9712.
• Equipment Review & Upgrade: Validate existing MFL systems meet standard requirements for magnetization, sensor configuration, and verification blocks.
• Procedural Integration: Update testing protocols, record templates, and report structures to reflect new documentation guidance.
• Timeline: While adoption deadlines may vary by jurisdiction, proactive implementation positions companies ahead of compliance audits and reduces business risk.

Risks of Non-Compliance:

• Incomplete or inaccurate inspections leading to undetected defects
• Regulatory or insurance non-conformities
• Increased liability for catastrophic failures

Technical Insights

Common Technical Requirements

• Qualified Personnel: Only MT-FL certified staff—proven via internationally recognized certification schemes—may perform MFL inspections.
• Coating Considerations: Steel surfaces may have non-conductive coatings up to 6 mm thick without hindering detection capability.
• Sensor and Probe Specifications: Multiple magnetic field sensors within a probe collect tangential and normal signal components during surface scanning.
• Reference Blocks: System verification and calibration with standardized reference blocks are mandatory, ensuring comparability of results and testing sensitivity.

Best Practices in Implementation

1. Pre-Test Preparation:
   • Conduct thorough site investigations and gather operational histories.
   • Prepare coated surfaces to satisfy maximum thickness requirements.
2. Equipment Setup:
   • Use magnetization devices and scanning probes that comply with system verification and functional check requirements.
   • Calibrate using manufacturer-specified reference blocks, documenting all settings.
3. Testing Execution:
   • Employ appropriate scanning modes to cover target areas, logging all procedural steps.
   • Monitor for MFL signal features indicating corrosion or mechanical damage.
4. Data Evaluation:
   • Employ both tangential and normal MFL signal analysis.
   • Document findings, and recommend further action as required.

Testing and Certification

• Document all test steps, calibration routines, and personnel qualifications for regulatory and client audits.
• Establish regular review cycles for equipment maintenance and functional verification.
• Participate in continuous professional development to maintain personnel certification under ISO 9712.

Conclusion / Next Steps

The publication of ISO 22500:2026 marks a leap forward in non-destructive testing best practices for the metallurgy sector, bringing clarity, rigor, and international harmonization to routine asset integrity inspections. By adopting this standard, organizations can significantly reduce safety risks, optimize maintenance planning, and ensure regulatory compliance across global operations.

Key Takeaways:

• ISO 22500:2026 introduces a unified methodology for MFL testing in steel plates and pipes
• Detailed requirements for personnel qualification, equipment calibration, and defect evaluation
• Practical benefits span safety, regulatory, and quality domains

Recommendations for Organizations:

• Review your current NDT procedures and upgrade to align with ISO 22500:2026
• Certify your NDT personnel and validate equipment readiness
• Implement robust documentation and reporting systems to support ongoing compliance

Stay ahead of industry demands and regulatory expectations—explore the latest international metallurgy standards and access the full text of ISO 22500:2026 on iTeh Standards.