ISO INTERNATIONAL STANDARD 15156-2 Fourth edition 2020-11 Petroleum and natural gas industries Materials for use in H,S- containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low- alloy steels, and the use of cast irons Industries du pétrole etdugaz naturel-Materiaux pourutilisation dansdesenvironnements contenant de I'hydrogene sulfure (H2S)dans laproductiondepétroleetdegaz- Partie 2:Aciers au carbone et aciers faiblementallies résistantsa la fissuration,etutilisationdefontes Reference number ISO 15156-2:2020(E) ISO @IS02020 IS0 15156-2:2020(E) COPYRIGHTPROTECTEDDOCUMENT ?ISO2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may below or ISo's member body in the country of the requester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS02020-Allrights reserved IS015156-2:2020(E) Contents Page Foreword iv Introduction A 1 Scope .1 2 Normativereferences .2 3 Terms and definitions .3 4 Symbols and abbreviatedterms. .6 5 Purchasing information .7 6 Factors affecting the behaviour of carbon and low alloy steels in H2S-containing environments. 7 7 Qualificationand selectionof carbonand low-alloysteelswithresistancetoSsC, SOHIC and SZC. .8 7.1 Option1-Selection of SsC-resistant steels (andcast irons)usingA.2 .8 7.1.1 For PH,s < 0,3 kPa (0,05 psi) .8 7.1.2 For PHs ≥ 0,3 kPa (0,05 psi) .8 7.2 Option 2 - Seiection of steels for specific sour-service applications or for ranges of sour service .8 7.2.1 Sulfide stress cracking .8 7.2.2 SOHIC and SZC 10 7.3 Hardness requirements 10 7.3.1 General. 10 7.3.2 Parent metals 10 7.3.3 Welds 11 7.4 Other fabrication methods. .16 8 Evaluationof carbon and low alloy steelsfor theirresistancetoHIc/SwC. .16 9 Marking,labelling,anddocumentation .17 Annex A (normative) SsC-resistant carbon and low alloy steels (and requirements and recommendationsfortheuseofcastirons) .18 AnnexB (normative)Qualificationofcarbonand low-alloysteelsforH2Sserviceby laboratory testing .27 Annex C (informative) Determination of H,Spartial pressure and use ofalternativeparameters.35 AnnexD(informative)RecommendationsfordeterminingpH .40 Annex E (informative) Information that should be supplied for material purchasing .45 Bibliography .47 @ IS0 2020 - All rights reserved iii