UNE-EN ISO 15156-2:2020

This document gives requirements and recommendations for the selection and qualification of carbonand low-alloy steels for service in equipment used in oil and natural gas production and natural gastreatment plants in H2S-containing environments, whose failure can pose a risk to the health and safetyof the public and personnel or to the environment. It can be applied to help to avoid costly corrosiondamage to the equipment itself. It supplements, but does not replace, the materials requirements of theappropriate design codes, standards or regulations.This document addresses the resistance of these steels to damage that can be caused by sulfide stresscracking(SSC) and the related phenomena of stress-oriented hydrogen-induced cracking (SOHIC) andsoft-zone cracking (SZC).This document also addresses the resistance of these steels to hydrogen-induced cracking (HIC) and itspossible development into stepwise cracking (SWC).This document is concerned only with cracking. Loss of material by general (mass loss) or localizedcorrosion is not addressed.Table 1 provides a non-exhaustive list of equipment to which this document is applicable, includingexclusions.This document applies to the qualification and selection of materials for equipment designed andconstructed using load controlled design methods. For design utilizing strain-based design methods,see ISO 15156-1:2020, Clause 5.Annex A lists SSC-resistant carbon and low alloy steels, and A.2.4 includes requirements for the use ofcast irons.This document is not necessarily suitable for application to equipment used in refining or downstreamprocesses and equipment.