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Lédéburite — Wikipédia
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Disponible en 32 langues." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-32" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">32 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%84%D9%8A%D8%AF%D9%8A%D8%A8%D9%88%D8%B1%D9%8A%D8%AA" title="ليديبوريت – arabe" lang="ar" hreflang="ar" data-title="ليديبوريت" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Ledeburit" title="Ledeburit – azerbaïdjanais" lang="az" hreflang="az" data-title="Ledeburit" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaïdjanais" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B2%E0%A7%87%E0%A6%A1%E0%A6%BF%E0%A6%AC%E0%A7%81%E0%A6%B0%E0%A6%BE%E0%A6%87%E0%A6%9F" title="লেডিবুরাইট – bengali" lang="bn" hreflang="bn" data-title="লেডিবুরাইট" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Ledeburit" title="Ledeburit – bosniaque" lang="bs" hreflang="bs" data-title="Ledeburit" data-language-autonym="Bosanski" data-language-local-name="bosniaque" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Ledeburita" title="Ledeburita – catalan" lang="ca" hreflang="ca" data-title="Ledeburita" data-language-autonym="Català" data-language-local-name="catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Ledeburit" title="Ledeburit – tchèque" lang="cs" hreflang="cs" data-title="Ledeburit" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Ledeburit" title="Ledeburit – allemand" lang="de" hreflang="de" data-title="Ledeburit" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9B%CE%B5%CE%B4%CE%B5%CE%B2%CE%BF%CF%85%CF%81%CE%AF%CF%84%CE%B7%CF%82" title="Λεδεβουρίτης – grec" lang="el" hreflang="el" data-title="Λεδεβουρίτης" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Ledeburite" title="Ledeburite – anglais" lang="en" hreflang="en" data-title="Ledeburite" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Ledeburita" title="Ledeburita – espagnol" lang="es" hreflang="es" data-title="Ledeburita" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Ledeburita" title="Ledeburita – basque" lang="eu" hreflang="eu" data-title="Ledeburita" data-language-autonym="Euskara" data-language-local-name="basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%84%D8%AF%D8%A8%D9%88%D8%B1%DB%8C%D8%AA" title="لدبوریت – persan" lang="fa" hreflang="fa" data-title="لدبوریت" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Ledeburit" title="Ledeburit – croate" lang="hr" hreflang="hr" data-title="Ledeburit" data-language-autonym="Hrvatski" data-language-local-name="croate" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ledeburite" title="Ledeburite – italien" lang="it" hreflang="it" data-title="Ledeburite" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%AC%E3%83%BC%E3%83%87%E3%83%96%E3%83%A9%E3%82%A4%E3%83%88" title="レーデブライト – japonais" lang="ja" hreflang="ja" data-title="レーデブライト" data-language-autonym="日本語" data-language-local-name="japonais" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9B%D0%B5%D0%B4%D0%B5%D0%B1%D1%83%D1%80%D0%B8%D1%82" title="Ледебурит – kazakh" lang="kk" hreflang="kk" data-title="Ледебурит" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9B%D0%B5%D0%B4%D0%B5%D0%B1%D1%83%D1%80%D0%B8%D1%82" title="Ледебурит – kirghize" lang="ky" hreflang="ky" data-title="Ледебурит" data-language-autonym="Кыргызча" data-language-local-name="kirghize" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Ledeburitas" title="Ledeburitas – lituanien" lang="lt" hreflang="lt" data-title="Ledeburitas" data-language-autonym="Lietuvių" data-language-local-name="lituanien" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Ledeburiet" title="Ledeburiet – néerlandais" lang="nl" hreflang="nl" data-title="Ledeburiet" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ledeburyt" title="Ledeburyt – polonais" lang="pl" hreflang="pl" data-title="Ledeburyt" data-language-autonym="Polski" data-language-local-name="polonais" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Ledeburita" title="Ledeburita – portugais" lang="pt" hreflang="pt" data-title="Ledeburita" data-language-autonym="Português" data-language-local-name="portugais" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Ledeburit%C4%83" title="Ledeburită – roumain" lang="ro" hreflang="ro" data-title="Ledeburită" data-language-autonym="Română" data-language-local-name="roumain" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9B%D0%B5%D0%B4%D0%B5%D0%B1%D1%83%D1%80%D0%B8%D1%82" title="Ледебурит – russe" lang="ru" hreflang="ru" data-title="Ледебурит" data-language-autonym="Русский" data-language-local-name="russe" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Ledeburit" title="Ledeburit – serbo-croate" lang="sh" hreflang="sh" data-title="Ledeburit" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croate" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Ledeburit" title="Ledeburit – slovaque" lang="sk" hreflang="sk" data-title="Ledeburit" data-language-autonym="Slovenčina" data-language-local-name="slovaque" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9B%D0%B5%D0%B4%D0%B5%D0%B1%D1%83%D1%80%D0%B8%D1%82" title="Ледебурит – serbe" lang="sr" hreflang="sr" data-title="Ледебурит" data-language-autonym="Српски / srpski" data-language-local-name="serbe" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ledeburit" title="Ledeburit – suédois" lang="sv" hreflang="sv" data-title="Ledeburit" data-language-autonym="Svenska" data-language-local-name="suédois" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Ledeb%C3%BCrit" title="Ledebürit – turc" lang="tr" hreflang="tr" data-title="Ledebürit" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9B%D0%B5%D0%B4%D0%B5%D0%B1%D1%83%D1%80%D0%B8%D1%82" title="Ледебурит – ukrainien" lang="uk" hreflang="uk" data-title="Ледебурит" data-language-autonym="Українська" data-language-local-name="ukrainien" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Ledeburit" title="Ledeburit – ouzbek" lang="uz" hreflang="uz" data-title="Ledeburit" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="ouzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ledeburit" title="Ledeburit – vietnamien" lang="vi" hreflang="vi" data-title="Ledeburit" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamien" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%8E%B1%E6%B0%8F%E4%BD%93" title="莱氏体 – chinois" lang="zh" hreflang="zh" data-title="莱氏体" data-language-autonym="中文" data-language-local-name="chinois" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q923944#sitelinks-wikipedia" title="Modifier les liens interlangues" class="wbc-editpage">Modifier les liens</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espaces de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div 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class="vector-page-tools-landmark" aria-label="Outils de la page"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Apparence"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Apparence</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">masquer</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="fr" dir="ltr"><p>La <b>lédéburite</b> est l'<a href="/wiki/Eutectique" title="Eutectique">eutectique</a> du diagramme fer-carbone, correspondant à une teneur de 4,3 % en masse de carbone ; sa <a href="/wiki/Formule_brute" title="Formule brute">formule brute</a> est (Fe<sub>3</sub>C:2Fe), il fond à <span title="2 098,4 °F ou 1 421,2 K" style="cursor:help">1 148</span> <abbr class="abbr" title="degré Celsius">°C</abbr>. Son nom vient d'<a href="/wiki/Adolf_Ledebur" title="Adolf Ledebur">Adolf Ledebur</a> (1837-1906), <a href="/wiki/M%C3%A9tallurgie" title="Métallurgie">métallurgiste</a> allemand, qui la décrivit en 1882. </p><p>D'un point de vue morphologique, lors du refroidissement d'un alliage fer-carbone contenant entre 2,11 et 6,67 % en masse de carbone, il se forme une matrice de <a href="/wiki/C%C3%A9mentite" title="Cémentite">cémentite</a> Fe<sub>3</sub>C contenant des globules d'<a href="/wiki/Aust%C3%A9nite" title="Austénite">austénite</a> à 2,11 % de carbone (limite gauche de l'horizontale à l'eutectique). Puis, en dessous de la température A<sub>1</sub> (<span title="1 340,6 °F ou 1 000,2 K" style="cursor:help">727</span> <abbr class="abbr" title="degré Celsius">°C</abbr>), l'austénite se transforme en <a href="/wiki/Perlite_(acier)" title="Perlite (acier)">perlite</a> ; l'alliage porte alors le nom de <a href="/wiki/Fonte_(m%C3%A9tallurgie)" title="Fonte (métallurgie)">fonte blanche</a>. </p><p>La cémentite est un composé <a href="/wiki/M%C3%A9tastabilit%C3%A9" title="Métastabilité">métastable</a>, qui tend à se décomposer en ferrite α et en <a href="/wiki/Graphite" title="Graphite">graphite</a> si l'on attend « suffisamment longtemps » : </p> <dl><dd>Fe<sub>3</sub>C → 3Fe + C</dd></dl> <p>Si le refroidissement de la fonte est suffisamment lent, et surtout si elle contient des éléments d'alliage dits « graphitisants » (<a href="/wiki/Silicium" title="Silicium">silicium</a>, <a href="/wiki/Cuivre" title="Cuivre">cuivre</a>, <a href="/wiki/Nickel" title="Nickel">nickel</a>), il ne se forme pas de lédéburite mais un eutectique à 4,25 %C, composé de graphite + austénite à 2,03 % en masse de carbone (fonte grise), et dont la température de fusion est <span title="2 107,4 °F ou 1 426,2 K" style="cursor:help">1 153</span> <abbr class="abbr" title="degré Celsius">°C</abbr>. </p> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/Fichier:Diagramme_fer_carbone.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Diagramme_fer_carbone.svg/400px-Diagramme_fer_carbone.svg.png" decoding="async" width="400" height="351" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Diagramme_fer_carbone.svg/600px-Diagramme_fer_carbone.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Diagramme_fer_carbone.svg/800px-Diagramme_fer_carbone.svg.png 2x" data-file-width="1047" data-file-height="919" /></a><figcaption>Diagramme fer-carbone.</figcaption></figure> <div class="clear" style="clear:both;"></div> <div class="mw-heading mw-heading2"><h2 id="Voir_aussi">Voir aussi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A9d%C3%A9burite&veaction=edit&section=1" title="Modifier la section : Voir aussi" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A9d%C3%A9burite&action=edit&section=1" title="Modifier le code source de la section : Voir aussi"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="ouvrage" id="BarralisMaeder1991"><span class="ouvrage" id="J._BarralisG._Maeder1991">J. Barralis et G. Maeder, <cite class="italique">Précis de métallurgie — Élaboration, structures-propriétés et normalisation</cite>, Nathan/Afnor, <time>1991</time> <small style="line-height:1em;">(<a href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/2-09-194017-8" title="Spécial:Ouvrages de référence/2-09-194017-8"><span class="nowrap">2-09-194017-8</span></a>)</small>, <abbr class="abbr" title="page(s)">p.</abbr> 51, 58<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Pr%C3%A9cis+de+m%C3%A9tallurgie+%E2%80%94+%C3%89laboration%2C+structures-propri%C3%A9t%C3%A9s+et+normalisation&rft.pub=Nathan%2FAfnor&rft.aulast=Barralis&rft.aufirst=J.&rft.au=G.+Maeder&rft.date=1991&rft.pages=51%2C+58&rft.isbn=2-09-194017-8&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AL%C3%A9d%C3%A9burite"></span></span></span></li></ul> <div class="navbox-container" style="clear:both;"> <table class="navbox collapsible noprint autocollapse" style=""> <tbody><tr><th class="navbox-title" colspan="2" style=""><div style="float:left; width:6em; text-align:left"><div class="noprint plainlinks nowrap tnavbar" style="padding:0; font-size:xx-small; color:var(--color-emphasized, #000000);"><a href="/wiki/Mod%C3%A8le:Palette_Fer_carbone" title="Modèle:Palette Fer carbone"><abbr class="abbr" title="Voir ce modèle.">v</abbr></a> · <a class="external text" href="https://fr.wikipedia.org/w/index.php?title=Mod%C3%A8le:Palette_Fer_carbone&action=edit"><abbr class="abbr" title="Modifier ce modèle. Merci de prévisualiser avant de sauvegarder.">m</abbr></a></div></div><div style="font-size:110%"><a href="/wiki/Fer" title="Fer">Fer</a> et <a href="/wiki/Carbone" title="Carbone">carbone</a></div></th> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Phase_(thermodynamique)" title="Phase (thermodynamique)">Phases</a></th> <td class="navbox-list" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Aust%C3%A9nite" title="Austénite">Austénite</a></li> <li><a href="/wiki/Bainite" title="Bainite">Bainite</a></li> <li><a href="/wiki/C%C3%A9mentite" title="Cémentite">Cémentite</a></li> <li><a href="/wiki/Ferrite_(acier)" title="Ferrite (acier)">Ferrite</a></li> <li><a href="/wiki/Graphite" title="Graphite">Graphite</a></li> <li><a class="mw-selflink selflink">Lédéburite</a></li> <li><a href="/wiki/Martensite" title="Martensite">Martensite</a></li> <li><a href="/wiki/Perlite_(acier)" title="Perlite (acier)">Perlite</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style=""><a href="/wiki/Acier" title="Acier">Aciers</a></th> <td class="navbox-list navbox-even" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Acier_Corten" title="Acier Corten">Acier Corten</a></li> <li><a href="/wiki/Acier_duplex" title="Acier duplex">Acier duplex</a></li> <li><a href="/wiki/Acier_%C3%A9lectrique" title="Acier électrique">Acier électrique</a></li> <li><a href="/wiki/Acier_inoxydable" title="Acier inoxydable">Acier inoxydable</a></li> <li><a href="/wiki/Acier_maraging" title="Acier maraging">Acier maraging</a></li> <li><a href="/wiki/Acier_rapide" title="Acier rapide">Acier rapide</a></li> <li><a href="/wiki/Low-background_steel" title="Low-background steel">Low-background steel</a></li> <li><a href="https://fr.wikibooks.org/wiki/Mat%C3%A9riaux/D%C3%A9signation_normalis%C3%A9e_des_aciers" class="extiw" title="b:Matériaux/Désignation normalisée des aciers">Désignation normalisée</a></li></ul> </div></td> </tr> <tr> <th class="navbox-group" style="">Autres produits ferreux</th> <td class="navbox-list" style=""><div class="liste-horizontale"> <ul><li><a href="/wiki/Fonte_(m%C3%A9tallurgie)" title="Fonte (métallurgie)">Fonte</a> (dont la <a href="/wiki/Fonte_brute" title="Fonte brute">fonte brute</a>)</li> <li><a href="/wiki/Puddlage" title="Puddlage">Fer puddlé</a></li> <li><a href="/wiki/Fer_forg%C3%A9" title="Fer forgé">Fer forgé</a></li></ul> </div></td> </tr> </tbody></table> </div> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Chimie" title="Portail de la chimie"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/24px-Nuvola_apps_edu_science.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/36px-Nuvola_apps_edu_science.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/48px-Nuvola_apps_edu_science.svg.png 2x" data-file-width="128" data-file-height="128" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Chimie" title="Portail:Chimie">Portail de la chimie</a></span> </span></li> <li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Physique" title="Portail de la physique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/24px-Circle-icons-physics-logo.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/36px-Circle-icons-physics-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/48px-Circle-icons-physics-logo.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Physique" title="Portail:Physique">Portail de la physique</a></span> </span></li> <li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Mat%C3%A9riaux" title="Portail des sciences des matériaux"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Circle-icons-material-logo.svg/24px-Circle-icons-material-logo.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Circle-icons-material-logo.svg/36px-Circle-icons-material-logo.svg.png 1.5x, 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