Overview
EN ISO 148-3:2016 (ISO 148-3:2016) specifies requirements for the preparation and characterization of Charpy V‑notch reference test pieces used for the indirect verification of pendulum impact testing machines. It complements ISO 148‑1 (test method) and ISO 148‑2 (machine verification) by defining stricter tolerances, qualification procedures and certification methods for reference specimens used to ensure consistent, traceable Charpy pendulum impact test results.
Key topics and requirements
- Reference test pieces: Notched Charpy V‑notch specimens with nominal dimensions identical to ISO 148‑1 but manufactured to more stringent tolerances for use in indirect verification.
- Material and heat treatment: Chemical composition and/or heat treatment are varied to produce specific energy levels; batches are qualified on dedicated reference machines.
- Reference machines: Characteristics and verification procedures for machines used to determine certified values (reference pendulum impact testing machines) are described.
- Batch qualification and certification: Procedures to qualify a batch of reference test pieces, issue certificates (including certified KV values) and document uncertainty are specified.
- Marking and traceability: Requirements for marking and traceability of reference test pieces and sets for use in industrial machine verification.
- Uncertainty assessment: Informative guidance (Annex A) on the uncertainty of the certified Charpy KV value for reference materials.
Practical applications
- Ensures consistent calibration and indirect verification of industrial pendulum impact machines used for material acceptance testing.
- Provides reference specimens for accreditation laboratories, calibration service providers, manufacturers of impact testing machines and quality control departments in metal production and fabrication.
- Useful where contract requirements or certification schemes mandate indirect verification using reference test pieces to avoid discrepancies between machines.
- Supports traceability and comparability of Charpy impact energy results across laboratories and supply chains.
Who should use this standard
- Mechanical testing laboratories and calibration laboratories
- Test equipment manufacturers and service engineers
- Quality managers in steel, alloy and metal fabrication industries
- Accreditation bodies and standards committees concerned with Charpy impact testing
Related standards
Keywords: Charpy pendulum impact test, Charpy V‑notch, EN ISO 148-3:2016, reference test pieces, indirect verification, pendulum impact machines, ISO 148-1, ISO 148-2, calibration, certified KV value.