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Standard Reference Materials - Certification Report for SRM 2237, 2238, 2239: RHS (Miniaturized) Charpy V-Notch Impact Specimens



Enrico Lucon, Raymond L. Santoyo, Jolene D. Splett


This Certification Report documents the procedures used to develop certified values of absorbed energy (KV) for the following RHS (Reduced Half-Size)-type miniaturized verification Charpy V-notch impact specimens: • SRM 2237 (low-energy level, KV = 3.87 J) • SRM 2238 (high-energy level, KV = 14.01 J) • SRM 2239 (super-high energy level, KV = 35.26 J). Certified values were obtained from the statistical analysis of a large number of impact tests performed on RHS specimens by means of a tabletop small-scale Charpy machine at NIST in Boulder, Colorado. The RHS specimens tested were machined from previously tested (broken) full-size Charpy V-notch verification specimens with energy levels corresponding to low energy (SRM 2092), high energy (SRM 2096), and super-high energy (SRM 2098). This report is intended to provide outside observers with accurate and detailed information on how the materials were certified and how the certification program was conducted. All certified values were established at room temperature (21 °C ± 1 °C).
Special Publication (NIST SP) - 260-211
Report Number


Charpy testing, indirect verification, MCVN, miniaturized Charpy specimens, RHS, small specimens, small-scale impact testers


Lucon, E. , Santoyo, R. and Splett, J. (2021), Standard Reference Materials - Certification Report for SRM 2237, 2238, 2239: RHS (Miniaturized) Charpy V-Notch Impact Specimens, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 24, 2024)


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Created May 11, 2021, Updated November 29, 2022