Certification of Charpy V-notch reference test pieces of 150 J nominal absorbed energy : certified reference material ERM-FA415t

This certification report describes the processing and characterisation of ERM-FA415t, a batch of Charpy V-notch certified reference test pieces. Sets of five of these test pieces are used for the verification of pendulum impact test machines according to EN 10045-2 (Charpy impact test on metallic materials, Part 2. Method for the verification of impact testing machines) or according to ISO 148-2 (Metallic materials - Charpy pendulum impact test - Part 2: Verification of test machines). The certified value for KV (= energy required to break a V-notched test piece using a pendulum impact test machine) is 153 J. The associated uncertainty (9 J, k = 2 corresponding to a confidence level of about 95 %) is calculated for the mean of a set of five test pieces. The absorbed energy (KV) is procedurally defined and refers to the impact energy required to break a V-notched bar of standardised dimensions, as defined in EN 10045-1 and ISO 148-1. The certified value of ERM-FA415t is traceable to the SI, via the SI-traceable certified value of the master batch ERM-FA415b, by testing samples of ERM-FA415b and ERM-FA415t under repeatability conditions on an impact pendulum verified and calibrated with SI-traceably calibrated tools. The certified value is valid only for strikers with a 2 mm tip radius. The certified value is valid at (20 ± 2) °C.