{"id":75397,"date":"2025-02-10T17:46:55","date_gmt":"2025-02-10T15:46:55","guid":{"rendered":"https:\/\/unm.fr\/?p=75397"},"modified":"2025-02-10T17:48:13","modified_gmt":"2025-02-10T15:48:13","slug":"nf-en-iso-4937-determination-du-chrome-dans-les-aciers-et-les-fontes","status":"publish","type":"post","link":"https:\/\/unm.fr\/en\/standards-of-the-month\/nf-en-iso-4937-determination-du-chrome-dans-les-aciers-et-les-fontes\/","title":{"rendered":"NF EN ISO 4937\u00a0: D\u00e9termination du chrome dans les aciers et les fontes"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"75397\" class=\"elementor elementor-75397\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3e20688 e-flex e-con-boxed e-con e-parent\" data-id=\"3e20688\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d709679 elementor-widget elementor-widget-text-editor\" data-id=\"d709679\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L\u2019ISO 4937 <em>Aciers et fontes\u00a0\u2014 D\u00e9termination du chrome\u00a0\u2014 M\u00e9thode par titrage potentiom\u00e9trique ou visuel<\/em> de 1986 a \u00e9t\u00e9 r\u00e9vis\u00e9e par l\u2019ISO\/TC 17\/SC 1 <em>M\u00e9thodes de d\u00e9termination de la composition chimique<\/em> en collaboration avec le CEN\/TC 459\/SC 2 et gr\u00e2ce \u00e0 la forte implication de Mme Maria PEL\u00c9 (Compalab), la pr\u00e9sidente de la commission UNM AC 102 <em>M\u00e9thodes d\u2019analyse chimique pour les aciers et les fontes<\/em>.<\/p><p>La nouvelle \u00e9dition de la NF EN ISO 4937 remplace la NF\u00a0EN\u00a024937 de septembre 1990. Cette norme sp\u00e9cifie une m\u00e9thode de d\u00e9termination par titrage potentiom\u00e9trique (ce qui signifie d\u00e9terminer une quantit\u00e9 de substance par l\u2019interm\u00e9diaire d\u2019une r\u00e9action chimique) ou visuel du chrome dans les aciers et les fontes.<\/p><p>La participation de la France aux travaux de r\u00e9vision a \u00e9t\u00e9 n\u00e9cessaire puisque la NF A06-329 <em>Analyse chimique des aciers et fontes\u00a0\u2014 Dosage du chrome (m\u00e9thode volum\u00e9trique)<\/em> qui traitait du m\u00eame sujet a \u00e9t\u00e9 annul\u00e9e depuis ao\u00fbt 1987.<\/p><p>En effet, les travaux de r\u00e9vision ont \u00e9t\u00e9 l&#8217;occasion de mettre la norme \u00e0 jour\u00a0:<\/p><ul><li>conform\u00e9ment \u00e0 l\u2019\u00e9tat de l\u2019art\u00a0;<\/li><li>d\u2019introduire une \u00e9lectrode de platine-Ag\/AgCl en option pour le titrage potentiom\u00e9trique\u00a0;<\/li><li>de r\u00e9\u00e9valuer les donn\u00e9es de fid\u00e9lit\u00e9 et de re-confirmer la limite sup\u00e9rieure des teneurs en vanadium dans les prises d&#8217;essai pour le titrage visuel.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>L\u2019ISO 4937 Aciers et fontes \u2014 D\u00e9termination du chrome \u2014 M\u00e9thode par titrage potentiom\u00e9trique ou visuel de 1986 a \u00e9t\u00e9 r\u00e9vis\u00e9e <\/p>\n","protected":false},"author":8,"featured_media":75305,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"date-de-webinaire":0,"heure-webinaire":"","duree-webinaire":"","lien-bouton-cta":"","footnotes":""},"categories":[38],"tags":[],"normes-associees":[3551,3554],"thematique":[79],"class_list":["post-75397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-focus-norme","normes-associees-en-iso-4937","normes-associees-nf-en-24937","thematique-acier"],"_links":{"self":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/75397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/comments?post=75397"}],"version-history":[{"count":11,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/75397\/revisions"}],"predecessor-version":[{"id":75426,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/75397\/revisions\/75426"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media\/75305"}],"wp:attachment":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media?parent=75397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/categories?post=75397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/tags?post=75397"},{"taxonomy":"normes-associees","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/normes-associees?post=75397"},{"taxonomy":"thematique","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/thematique?post=75397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}