Abstract
Since 2014, considerable attention has been paid to the standardization of small punch test technique within the American Society of Testing and Materials (ASTM). In 2016 large inter-laboratory study has been launched within the ASTM subcommittee E10.2 - Behavior and Use of Nuclear Structural Materials, involving 12 laboratories and 6 evaluated structural materials from the nuclear power plant components. Paper describes the current status of ASTM standardization, results of the inter-laboratory study, lessons learned and open questions remaining to be solved for the successful completion of the standardization process.