ISO 15156-2:2015为含有硫化氢的环境中用于石油和天然气生产的设备和天然气处理厂的碳和低合金钢的使用选择和鉴定提出了要求和建议，其故障可能会造成风险对公众和人员或环境的健康和安全。它可以用于帮助避免对设备本身造成昂贵的腐蚀损坏。它补充，但不能取代相应设计规范，标准或法规的材料要求。 ISO 15156-2:2015针对硫化物应力开裂（SSC）和应力取向氢诱发裂纹（SOHIC）和软区裂纹（SZC）的相关现象，可以解决这些钢对损伤的阻力。 ISO 15156-2:2015还解决了这些钢对氢致裂纹（HIC）的阻力及其可能发展为逐步开裂（SWC）。 ISO 15156-2:2015只关心破解。一般材料损失（质量损失）或局部腐蚀未得到解决。 表1提供了ISO 15156适用部分的非详尽的设备清单，包括允许的排除。 ISO 15156-2:2015适用于设备材料的鉴定和选择

ISO 15156-2:2015 gives requirements and recommendations for the selection and qualification of carbon and low-alloy steels for service in equipment used in oil and natural gas production and natural gas treatment plants in H2S-containing environments, whose failure can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the materials requirements of the appropriate design codes, standards or regulations. ISO 15156-2:2015 addresses the resistance of these steels to damage that can be caused by sulfide stress-cracking (SSC) and the related phenomena of stress-oriented hydrogen-induced cracking (SOHIC) and soft-zone cracking (SZC). ISO 15156-2:2015 also addresses the resistance of these steels to hydrogen-induced cracking (HIC) and its possible development into stepwise cracking (SWC). ISO 15156-2:2015 is concerned only with cracking. Loss of material by general (mass loss) or localized corrosion is not addressed. Table 1 provides a non-exhaustive list of equipment to which this part of ISO 15156 is applicable, including permitted exclusions. ISO 15156-2:2015 applies to the qualification and selection of materials for equipment designed and constructed using load controlled design methods. For design utilizing strain-based design methods, see ISO 15156-1:2015, Clause 5. Annex A lists SSC-resistant carbon and low alloy steels, and A.2.4 includes requirements for the use of cast irons. ISO 15156-2:2015 is not necessarily suitable for application to equipment used in refining or downstream processes and equipment.