Abstract

This document specifies requirements and gives recommendations for assessment of the service environment, and the selection of metallic materials used in oil and gas production in H₂S-containing environments, where the failure can pose a risk to the functionality of the equipment, to the health and safety of the public and personnel or to the environment. This document is not intended for application to equipment for carbon capture, utilisation and/or storage (CCUS, CCS) or downstream oil and gas (for downstream applications see ISO 17945/NACE MR0103), but the guidance and principles can be applied by the equipment user for these applications. This document addresses the selection of carbon and low alloy steels, cast irons, corrosion-resistant alloys and other alloys for resistance to damage mechanisms that are a consequence of H₂S, or which are exacerbated by H₂S. This includes sulphide stress cracking, hydrogen-induced cracking, stepwise cracking, stress-oriented hydrogen-induced cracking, soft-zone cracking, galvanically induced hydrogen stress cracking and stress corrosion cracking. Some of these mechanisms can also occur in environments that do not contain H₂S, but these are not included in the scope of this document. These are not included in the scope of this document. Materials with established service limits, or which have a successful history of application are listed. A path for qualifying and accepting materials that are not listed is described in ISO 15156-3. NOTE H₂S can also influence degradation mechanisms other than cracking, including general and localized corrosion. This document is intended primarily for equipment users and other parties that select and accept materials and equipment for service in H₂S-containing environments. It stipulates when materials need to be specified to be in conformance with ISO 15156-1 or qualified in conformance with ISO 15156-3. All oil and gas production equipment categories handling H₂S-containing fluids are within the scope of this document, including but not limited to: a) drilling, well construction, and well-servicing equipment; b) wells including subsurface equipment, gas lift equipment, wellheads, and tree equipment; c) flow-lines, gathering lines, field facilities, and field processing plants; d) water-handling, injection and disposal equipment; e) gas-handling and injection equipment including those used for CO₂ enhanced oil recovery; f) natural gas treatment plants (for gas sweeting plants see also API RP 945); g) transportation pipelines for liquids, gases, and multi-phase fluids. Exclusions to the scope of this document are given in Table 1.

Begin

2025-10-13

WI

00012474

Planned document number

DIN EN ISO 15156-2

Project number

10900522

Responsible national committee

NA 109-00-01-67 AK - Materials, coatings and corrosion testing – Mirror committee of ISO/TC 67/WG 7, ISO/TC 67/WG 8 and ISO/TC 67/WG 11  

Responsible european committee

CEN/TC 12 - Oil and gas industries including lower carbon energy.  

Responsible international committee

ISO/TC 67/WG 7 - Corrosion resistant materials  

previous edition(s)

Petroleum and natural gas industries - Materials for use in H₂S-containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low-alloy steels, and the use of cast irons (ISO 15156-2:2020); German version EN ISO 15156-2:2020
2025-02

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