prEN ISO 148-3

• Abstract:

  ISO 148-3:2016 specifies the requirements, preparation and methods for qualifying test pieces used for the indirect verification of pendulum impact testing machines in accordance with ISO 148‑2.; It specifies notched test pieces with nominal dimensions identical to those specified in ISO 148‑1; however, the tolerances are more stringent.; NOTE 1 The chemical composition or heat treatment, or both, are varied according to the energy level desired.; NOTE 2 Reference test pieces are qualified on reference pendulum impact testing machines which are also described in this part of ISO 148.

• Status: Not Published
• Publication Date: 02-May-2027
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 31-Aug-2026
• Completion Date: 31-Aug-2026
• Ref Project: oSIST prEN ISO 148-3:2025 - Metallic materials - Charpy pendulum impact test - Part 3: Preparation and characterization of Charpy V-notch reference certified test pieces for indirect verification of pendulum impact testing machines (ISO/DIS 148-3:2025)

• Revises: EN ISO 148-3:2016 - Metallic materials - Charpy pendulum impact test - Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines (ISO 148-3:2016)
• Effective Date: 04-Oct-2023

Overview

prEN ISO 148-3 (ISO/DIS 148-3:2025) defines the preparation and characterization of Charpy V‑notch certified reference test pieces for the indirect verification of pendulum impact testing machines. This fourth‑edition draft updates ISO 148-3:2016 and complements Part 1 (test method) and Part 2 (machine verification) of the Charpy series. The standard covers requirements for producing, qualifying and certifying notched test pieces used to check the performance of Charpy pendulum impact testing machines.

Key topics and technical requirements

• Reference test piece dimensions: Nominal dimensions match ISO 148‑1 Charpy V‑notch pieces, but with more stringent tolerances for certified reference use.
• Material and heat treatment: Chemical composition and/or heat treatment are adjusted to achieve specific reference absorbed energy levels for different energy classes.
• Reference testing machines: Characteristics and verification of the reference pendulum impact testing machine are specified (geometrical features, capacity, hardness, vibration limits, energy‑indicating mechanism). Reference machines are used to determine the certified K (absorbed energy) values.
• Batch qualification and certification: Procedures for qualification of a batch, marking, issuing of certificates for certified reference test pieces, and formation of certified sets are described.
• Measurement and uncertainty: Informative guidance (Annex A) covers the uncertainty of the certified K value assigned to reference test pieces.
• Documentation and traceability: Certificates and supporting data ensure traceability of reference values and support indirect machine verification per ISO 148‑2.

Practical applications and users

This standard is essential for organizations that need reliable, reproducible Charpy impact results and for demonstrating machine performance beyond direct calibration:

• Calibration and metrology laboratories that certify reference Charpy specimens.
• Materials testing laboratories performing periodic indirect verification of industrial pendulum machines.
• Manufacturers and suppliers of certified reference test pieces.
• Quality assurance teams and procurement specifying acceptance testing for steel, alloys and other metallic materials.
• Standards bodies and auditors enforcing conformity with impact testing requirements.

Using certified reference test pieces per ISO 148-3 helps avoid inter‑machine discrepancies in absorbed energy results and supports consistent acceptance testing of metallic materials.

Related standards

• ISO 148‑1: Charpy test method (test piece dimensions and procedure)
• ISO 148‑2: Verification of testing machines (direct and indirect verification requirements)
• Historically referenced documents: EN 10045‑2 (obsolete) and ASTM E23 - other industry codes may also require indirect verification using certified reference pieces.