{"id":2618,"date":"2025-09-18T01:36:04","date_gmt":"2025-09-18T01:36:04","guid":{"rendered":"https:\/\/greenyellow-gerbil-196913.hostingersite.com\/?post_type=product&#038;p=2618"},"modified":"2025-09-18T01:53:29","modified_gmt":"2025-09-18T01:53:29","slug":"large-square-billet-250x250mm-q345b","status":"publish","type":"product","link":"https:\/\/baosteelmaterials.com\/fr\/produit\/large-square-billet-250x250mm-q345b\/","title":{"rendered":"Grande pi\u00e8ce carr\u00e9e 250x250mm 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>Assure une bonne soudabilit\u00e9 et une bonne formabilit\u00e9 pour le traitement de grandes sections<\/td>\n<\/tr>\n<tr>\n<td>- Silicium (Si)<\/td>\n<td>\u22640.55<\/td>\n<td>Favorise la d\u00e9soxydation et contribue \u00e0 la conservation de la force<\/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 des sections \u00e9paisses<\/td>\n<\/tr>\n<tr>\n<td>- Phosphore (P)<\/td>\n<td>\u22640.040<\/td>\n<td>Minimis\u00e9 pour \u00e9viter la fragilisation des grandes billettes<\/td>\n<\/tr>\n<tr>\n<td>- Soufre (S)<\/td>\n<td>\u22640.040<\/td>\n<td>La faible teneur r\u00e9duit la fissuration \u00e0 chaud pendant la fabrication<\/td>\n<\/tr>\n<tr>\n<td>- Niobium (Nb)<\/td>\n<td>\u22640.07<\/td>\n<td>Microalliage pour l'affinement du grain, essentiel pour les grandes sections<\/td>\n<\/tr>\n<tr>\n<td>- Vanadium (V)<\/td>\n<td>\u22640.15<\/td>\n<td>Am\u00e9liore l'uniformit\u00e9 de la r\u00e9sistance sur les sections transversales \u00e9paisses<\/td>\n<\/tr>\n<tr>\n<td>- Titane (Ti)<\/td>\n<td>\u22640.20<\/td>\n<td>Am\u00e9lioration de la t\u00e9nacit\u00e9 et de la stabilit\u00e9 structurelle des grandes billettes<\/td>\n<\/tr>\n<tr>\n<td>- Azote (N)<\/td>\n<td>\u22640.012<\/td>\n<td>Contr\u00f4l\u00e9 pour \u00e9viter la porosit\u00e9 dans l'acier \u00e9pais<\/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 une \u00e9paisseur \u226416mm ; ajust\u00e9 pour une section de 250mm selon la norme.<\/td>\n<\/tr>\n<tr>\n<td>- R\u00e9sistance \u00e0 la traction (Rm)<\/td>\n<td>470-630 MPa<\/td>\n<td>Assure la capacit\u00e9 de charge dans les applications structurelles lourdes<\/td>\n<\/tr>\n<tr>\n<td>- Allongement (A)<\/td>\n<td>\u226521%<\/td>\n<td>Assure la ductilit\u00e9 pour l'usinage \u00e0 chaud\/\u00e0 froid de grandes billettes<\/td>\n<\/tr>\n<tr>\n<td>- \u00c9nergie d'impact (Akv)<\/td>\n<td>\u226534 J<\/td>\n<td>\u00c0 20\u2103 (\u00e9chantillon longitudinal), r\u00e9siste \u00e0 la fracture dans les sections \u00e9paisses.<\/td>\n<\/tr>\n<tr>\n<td>- Essai de flexion<\/td>\n<td>180\u00b0<\/td>\n<td>Diam\u00e8tre du coude : 3a (pour une section de 250 mm, \"a\" = dimension pertinente)<\/td>\n<\/tr>\n<tr>\n<td><strong>Dimensions<\/strong><\/td>\n<td>250 x 250 mm (section carr\u00e9e)<\/td>\n<td>Taille nominale ; tol\u00e9rance conforme \u00e0 GB\/T 702-2017<\/td>\n<\/tr>\n<tr>\n<td><strong>Longueur<\/strong><\/td>\n<td>6-12m (personnalisable)<\/td>\n<td>Gamme de livraison standard ; longueurs plus importantes disponibles sur demande<\/td>\n<\/tr>\n<tr>\n<td><strong>Qualit\u00e9 de la surface<\/strong><\/td>\n<td>Exempt de fissures, de plis et d'\u00e9cailles excessives<\/td>\n<td>Assure l'aptitude au traitement ult\u00e9rieur (forgeage, laminage)<\/td>\n<\/tr>\n<tr>\n<td><strong>Conditions de livraison<\/strong><\/td>\n<td>Lamin\u00e9s \u00e0 chaud, normalis\u00e9s ou TMCP<\/td>\n<td>TMCP recommand\u00e9 pour des propri\u00e9t\u00e9s m\u00e9caniques optimales dans les grandes sections<\/td>\n<\/tr>\n<tr>\n<td><strong>Applications typiques<\/strong><\/td>\n<td>Ch\u00e2ssis de machines lourdes, \u00e9l\u00e9ments structurels de ponts, billettes de tuyaux de grand diam\u00e8tre, coques d'appareils \u00e0 pression et structures industrielles \u00e0 forte charge<\/td>\n<td>Id\u00e9al pour les projets n\u00e9cessitant des mati\u00e8res premi\u00e8res de grande taille et de haute r\u00e9sistance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>Le grand billet carr\u00e9 250x250mm Q345B est un produit en acier de premi\u00e8re qualit\u00e9, faiblement alli\u00e9 et \u00e0 haute r\u00e9sistance, con\u00e7u pour r\u00e9pondre aux exigences rigoureuses de la fabrication lourde et des projets d'infrastructure \u00e0 grande \u00e9chelle. Conforme aux normes GB\/T 1591-2008, ce billet carr\u00e9 de 250x250mm combine une r\u00e9sistance, une stabilit\u00e9 dimensionnelle et une maniabilit\u00e9 exceptionnelles, ce qui en fait une mati\u00e8re premi\u00e8re indispensable pour cr\u00e9er des composants robustes et porteurs dans les domaines de la construction, des machines et de l'ing\u00e9nierie industrielle.<\/p>","protected":false},"featured_media":2565,"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-2618","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\/2618","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=2618"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/media\/2565"}],"wp:attachment":[{"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/media?parent=2618"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_brand?post=2618"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_cat?post=2618"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/baosteelmaterials.com\/fr\/wp-json\/wp\/v2\/product_tag?post=2618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}