{"id":2619,"date":"2025-09-18T01:36:06","date_gmt":"2025-09-18T01:36:06","guid":{"rendered":"https:\/\/greenyellow-gerbil-196913.hostingersite.com\/?post_type=product&#038;p=2619"},"modified":"2025-09-18T01:39:44","modified_gmt":"2025-09-18T01:39:44","slug":"large-square-billet-300x300mm-q345b","status":"publish","type":"product","link":"https:\/\/baosteelmaterials.com\/fr\/produit\/large-square-billet-300x300mm-q345b\/","title":{"rendered":"Grandes billettes carr\u00e9es 300x300mm Q345B"},"content":{"rendered":"<table>\n<thead>\n<tr>\n<th>Param\u00e8tres<\/th>\n<th>Valeur<\/th>\n<th>Remarques<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Standard<\/strong><\/td>\n<td>GB\/T 1591-2008<\/td>\n<td>Norme pour les aciers de construction \u00e0 haute r\u00e9sistance faiblement alli\u00e9s<\/td>\n<\/tr>\n<tr>\n<td><strong>Grade<\/strong><\/td>\n<td>Q345B<\/td>\n<td>Impact test\u00e9 \u00e0 20\u2103<\/td>\n<\/tr>\n<tr>\n<td><strong>Composition chimique (wt%)<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>- Carbone (C)<\/td>\n<td>\u22640.20<\/td>\n<td>Pour garantir une soudabilit\u00e9 et une formabilit\u00e9 ad\u00e9quates des billettes de grande section<\/td>\n<\/tr>\n<tr>\n<td>- Silicium (Si)<\/td>\n<td>\u22640.55<\/td>\n<td>Contribue \u00e0 la d\u00e9soxydation et influe sur les propri\u00e9t\u00e9s de r\u00e9sistance et de t\u00e9nacit\u00e9.<\/td>\n<\/tr>\n<tr>\n<td>- Mangan\u00e8se (Mn)<\/td>\n<td>\u22641.70<\/td>\n<td>Am\u00e9liore la r\u00e9sistance et la t\u00e9nacit\u00e9 de la section \u00e9paisse<\/td>\n<\/tr>\n<tr>\n<td>- Phosphore (P)<\/td>\n<td>\u22640.040<\/td>\n<td>Maintenu \u00e0 un niveau bas pour \u00e9viter la fragilisation des grandes billettes<\/td>\n<\/tr>\n<tr>\n<td>- Soufre (S)<\/td>\n<td>\u22640.040<\/td>\n<td>Minimis\u00e9 pour r\u00e9duire le risque de fissuration pendant le traitement<\/td>\n<\/tr>\n<tr>\n<td>- Niobium (Nb)<\/td>\n<td>\u22640.07<\/td>\n<td>El\u00e9ment de microalliage pour l'affinement du grain, am\u00e9liorant les propri\u00e9t\u00e9s m\u00e9caniques<\/td>\n<\/tr>\n<tr>\n<td>- Vanadium (V)<\/td>\n<td>\u22640.15<\/td>\n<td>Aide au renforcement et \u00e0 l'am\u00e9lioration de la r\u00e9sistance \u00e0 la chaleur dans les sections \u00e9paisses<\/td>\n<\/tr>\n<tr>\n<td>- Titane (Ti)<\/td>\n<td>\u22640.20<\/td>\n<td>Contribue \u00e0 am\u00e9liorer la t\u00e9nacit\u00e9 et la stabilit\u00e9 structurelle<\/td>\n<\/tr>\n<tr>\n<td>- Azote (N)<\/td>\n<td>\u22640.012<\/td>\n<td>Contr\u00f4l\u00e9 pour \u00e9viter les probl\u00e8mes de porosit\u00e9 et de fragilisation<\/td>\n<\/tr>\n<tr>\n<td><strong>Propri\u00e9t\u00e9s m\u00e9caniques<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>- Limite d'\u00e9lasticit\u00e9 (ReL)<\/td>\n<td>\u2265345 MPa<\/td>\n<td>Pour la gamme d'\u00e9paisseur applicable \u00e0 la section 300x300mm ; ajust\u00e9 selon les exigences de la norme<\/td>\n<\/tr>\n<tr>\n<td>- R\u00e9sistance \u00e0 la traction (Rm)<\/td>\n<td>470 - 630 MPa<\/td>\n<td>Garantit la capacit\u00e9 \u00e0 supporter de lourdes charges dans les applications structurelles<\/td>\n<\/tr>\n<tr>\n<td>- Allongement (A)<\/td>\n<td>\u226521%<\/td>\n<td>Fournit la ductilit\u00e9 n\u00e9cessaire \u00e0 la fabrication et au fonctionnement<\/td>\n<\/tr>\n<tr>\n<td>- \u00c9nergie d'impact (Akv)<\/td>\n<td>\u226534 J<\/td>\n<td>\u00c0 20\u2103 (\u00e9chantillon longitudinal), important pour r\u00e9sister \u00e0 un impact soudain et maintenir l'int\u00e9grit\u00e9.<\/td>\n<\/tr>\n<tr>\n<td>- Essai de flexion<\/td>\n<td>180\u00b0<\/td>\n<td>Diam\u00e8tre de courbure : 3a (o\u00f9 \"a\" repr\u00e9sente la longueur du c\u00f4t\u00e9 de la billette carr\u00e9e ou la dimension pertinente, ici pour une billette de 300x300mm)<\/td>\n<\/tr>\n<tr>\n<td><strong>Dimensions<\/strong><\/td>\n<td>300 x 300 mm (section carr\u00e9e)<\/td>\n<td>Taille nominale ; avec des plages de tol\u00e9rances admissibles selon les normes de fabrication<\/td>\n<\/tr>\n<tr>\n<td><strong>Longueur<\/strong><\/td>\n<td>Habituellement 6 - 12m (personnalisable)<\/td>\n<td>Longueurs de livraison standard, pouvant \u00eatre ajust\u00e9es en fonction des besoins sp\u00e9cifiques du projet<\/td>\n<\/tr>\n<tr>\n<td><strong>Qualit\u00e9 de la surface<\/strong><\/td>\n<td>Ils doivent \u00eatre exempts de fissures, de d\u00e9fauts de surface importants tels que des rayures profondes, et de traces d'oxydation excessives.<\/td>\n<td>Pour s'assurer de l'ad\u00e9quation avec les \u00e9tapes de traitement ult\u00e9rieures telles que le forgeage, le laminage, etc.<\/td>\n<\/tr>\n<tr>\n<td><strong>Conditions de livraison<\/strong><\/td>\n<td>Lamin\u00e9s \u00e0 chaud, normalis\u00e9s ou TMCP (Thermo-Mechanical Control Process)<\/td>\n<td>Sur la base d'exigences sp\u00e9cifiques pour optimiser les propri\u00e9t\u00e9s m\u00e9caniques et les besoins de fabrication<\/td>\n<\/tr>\n<tr>\n<td><strong>Applications typiques<\/strong><\/td>\n<td>\u00c9l\u00e9ments de structure pour grands ponts, ch\u00e2ssis de machines industrielles lourdes, billettes de fabrication de tuyaux de grand diam\u00e8tre, structures de fondation pour immeubles de grande hauteur et composants pour grands r\u00e9cipients sous pression.<\/td>\n<td>Id\u00e9al pour les applications exigeant des mat\u00e9riaux en acier de grande taille, \u00e0 haute r\u00e9sistance et \u00e0 bonne usinabilit\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>La grande billette carr\u00e9e 300x300mm Q345B est un acier de construction faiblement alli\u00e9 \u00e0 hautes performances, con\u00e7u pour r\u00e9pondre aux exigences les plus strictes des infrastructures \u00e0 grande \u00e9chelle, de la machinerie lourde et de la fabrication industrielle. Conforme aux normes GB\/T 1591-2008, cette billette carr\u00e9e de 300 x 300 mm combine une r\u00e9sistance exceptionnelle, une stabilit\u00e9 dimensionnelle et une facilit\u00e9 de traitement, ce qui en fait la pierre angulaire des m\u00e9gaprojets o\u00f9 la fiabilit\u00e9 et l'int\u00e9grit\u00e9 structurelle ne sont pas n\u00e9gociables.<\/p>","protected":false},"featured_media":2570,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[27],"product_tag":[],"class_list":["post-2619","product","type-product","status-publish","has-post-thumbnail","product_cat-square-billets","desktop-align-left","tablet-align-left","mobile-align-left","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product\/2619","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/comments?post=2619"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/media\/2570"}],"wp:attachment":[{"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/media?parent=2619"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_brand?post=2619"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_cat?post=2619"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_tag?post=2619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}