{"id":708,"date":"2019-01-14T22:15:20","date_gmt":"2019-01-14T22:15:20","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=708"},"modified":"2019-01-14T22:25:21","modified_gmt":"2019-01-14T22:25:21","slug":"susceptibility-of-p91-and-p92-pipework-to-type-iv-cracking","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=708","title":{"rendered":"Susceptibility of P91 and P92 pipework to Type IV cracking"},"content":{"rendered":"<p><strong>Component:<\/strong><\/p>\r\n<ul>\r\n    <li>Main steam pipework fabricated from advanced 9Cr steels<\/li>\r\n<\/ul>\r\n<div><strong>Objective:<\/strong><\/div>\r\n<ul>\r\n    <li>To determine the operating temperatures and timescales at which advanced steel pipework might be susceptible to Type IV cracking&#160;&#160;<\/li>\r\n<\/ul>\r\n<div><strong>Approach:&#160;<\/strong><\/div>\r\n<ul>\r\n    <li>Study of the known behaviour of CrMoV and X20 piping systems<\/li>\r\n    <li>Cross-weld testing of advanced steels<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Determination of typical and critical system stresses<\/li>\r\n    <li>Quantification of weldment strength relative to parent material, as a function of service conditions<\/li>\r\n    <li>Production of maps for predicting weld failure location and time<\/li>\r\n    <li>Definition of service conditions for which these steels are relatively immune to Type IV cracking<\/li>\r\n<\/ul>\r\n<div>&#160;<figure id=\"attachment_710\" aria-describedby=\"caption-attachment-710\" style=\"width: 800px\" class=\"wp-caption alignleft\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/P91-map.gif\" alt=\"\" width=\"800\" height=\"435\" class=\"size-full wp-image-710\" \/><figcaption id=\"caption-attachment-710\" class=\"wp-caption-text\">Failure mechanism map for P91 pipework weldments, based on full-thickness cross-weld tests<\/figcaption><\/figure><\/div>\r\n<h4><strong>Published:<\/strong><\/h4>\r\n<div>Brear, J.M. <br \/>\r\n\u201cWeld life prediction \u2013 building on experience\u201d<br \/>\r\nInternational VDI Conference \u2018Alloys in Power Plant Technology\u2019, Berlin 11-12 November 2014<\/div>\r\n<div>&#160;<\/div>\r\n<div>Brear, J.M. and Fleming, A<\/div>\r\n<div>\u201cPrediction of P91 life under plant operating conditions\u201d<\/div>\r\n<div>ETD Int Conf \u2018High Temperature Plant Integrity and Life Extension\u2019 Robinson College, Cambridge, 14-16 Apr 2004<\/div>\r\n<div>&#160;<\/div>\r\n<div>Middleton, C.J., Brear, J.M, Munson, R and Viswanathan, R<br \/>\r\n\u201cAn assessment of the risk of Type IV cracking in welds to header, pipework and turbine components constructed from the advanced ferritic 9% and 12% chromium steels\u201d<br \/>\r\n3rd EPRI Conf \u2018Advances in Material Technology for Fossil Power Plants\u2019, Swansea, April 2001.&#160; EPRI Report 1001462.&#160; Inst Materials, London, Book 0770 pp.69-78<\/div>\r\n<div>&#160;<\/div>\r\n<div>&#160;<\/div>","protected":false},"excerpt":{"rendered":"<p>Component: Main steam pipework fabricated from advanced 9Cr steels Objective: To determine the operating temperatures and timescales at which advanced steel pipework might be susceptible to Type IV cracking&#160;&#160; Approach:&#160; Study of the known behaviour of CrMoV and X20 piping systems Cross-weld testing of advanced steels Benefits: Determination of typical and critical system stresses Quantification &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=708\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Susceptibility of P91 and P92 pipework to Type IV cracking<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":167,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-708","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=708"}],"version-history":[{"count":4,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/708\/revisions"}],"predecessor-version":[{"id":711,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/708\/revisions\/711"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/167"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}