EN ISO 21028-2:2018

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Requirements for steels with specified yield
  strength <=460 N/mm2
6 General test requirements
7 Welds
8 Requirements for aluminium and aluminium
  alloys, copper and copper alloys and austenitic stainless steels
Annex A (informative) - Case proposal - Technical justification
        for temperature adjustment term
Annex B (informative) - Example of calculation of the
        lowest temperature authorized during operation
Bibliography
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of Directive
         2014/68/EU of the European Parliament and of the
         Council of 15 May 2014 on the harmonization of
         the laws of the Member States relating to the
         making available on the market of pressure equipment

ISO 21028-2:2018 specifies the toughness requirements of metallic materials for use at temperatures between −20 °C and −80 °C to ensure their suitability for cryogenic vessels. This document is applicable to fine-grain and low-alloyed steels with specified yield strength ≤460 N/mm2, aluminium and aluminium alloys, copper and copper alloys and austenitic stainless steels.NOTE For steel materials listed in EN 13445‑2 or EN 13480‑2 or for steel materials and weldings complying with the same fundamental safety requirements, the requirements for prevention of brittle fracture at low temperatures according to EN 13445‑2:2014, Annex B, method 2, or EN 13480‑2:2012, Annex B, method 2 can be applied.