{"id":165,"date":"2018-01-03T09:47:15","date_gmt":"2018-01-03T06:47:15","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=165"},"modified":"2020-11-02T12:00:49","modified_gmt":"2020-11-02T09:00:49","slug":"stal","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/fr\/acier\/","title":{"rendered":"Acier : propri\u00e9t\u00e9s, marquages, normes GOST et types d&#039;acier"},"content":{"rendered":"<p>L&#039;acier, l&#039;un des m\u00e9taux les plus courants, est celui qui b\u00e9n\u00e9ficie aujourd&#039;hui de la plus large application. Traitement et <a href=\"https:\/\/metallsmaster.pro\/fr\/tous-types-de-decoupe-de-metaux\/\">coupe<\/a> Ce mat\u00e9riel est une t\u00e2che qui peut \u00eatre r\u00e9solue en utilisant une grande vari\u00e9t\u00e9 d\u2019outils et de technologies. <strong>Propri\u00e9t\u00e9s de l&#039;acier <\/strong>permettent un traitement pr\u00e9cis et rapide en utilisant les types de traitement suivants\u00a0:<\/p>\n<ul>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/gilote-en-metal\/\">d\u00e9coupe m\u00e9canique<\/a>;<\/li>\n<li>jet d&#039;eau;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/soudage-a-larc-sous-argon\/\">arc \u00e0 argon<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/soudage-a-larc-electrique-des-metaux\/\">arc \u00e9lectrique<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/equipement-de-coupage-au-gaz\/\">gaz<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/coupage-a-larc-plasma\/\">plasma<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/fr\/decoupe-laser\/\">laser<\/a>.<\/li>\n<\/ul>\n<p>Selon <strong>nuances d&#039;acier<\/strong> et les r\u00e9sultats requis, utilisez la technologie de traitement des m\u00e9taux la plus appropri\u00e9e.<\/p>\n<h2>Propri\u00e9t\u00e9s de l&#039;acier<\/h2>\n<p>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<br \/>\nIl existe 4 principaux domaines d\u2019indicateurs qui distinguent l\u2019acier et ses alliages.<\/p>\n<p>Parmi ces domaines :<\/p>\n<ul>\n<li>propri\u00e9t\u00e9s chimiques de l&#039;acier;<\/li>\n<li>technologique;<\/li>\n<li>propri\u00e9t\u00e9s m\u00e9caniques de l&#039;acier;<\/li>\n<li>propri\u00e9t\u00e9s magn\u00e9tiques de l&#039;acier.<\/li>\n<\/ul>\n<p>Parlons maintenant de chacun d\u2019eux plus en d\u00e9tail.<\/p>\n<h3>Propri\u00e9t\u00e9s chimiques de l&#039;acier<\/h3>\n<ul>\n<li><strong>Oxydabilit\u00e9.<\/strong>\u00a0Il s&#039;agit d&#039;une mesure de la capacit\u00e9 \u00e0 se combiner avec l&#039;oxyg\u00e8ne. L&#039;oxydation augmente avec la temp\u00e9rature du m\u00e9tal. Les aciers \u00e0 faible teneur en carbone s&#039;oxydent pour former de la rouille (oxydes de fer) lorsqu&#039;ils sont expos\u00e9s \u00e0 l&#039;eau ou \u00e0 l&#039;air humide\u00a0;<\/li>\n<li><strong>R\u00e9sistance \u00e0 la corrosion.\u00a0<\/strong>Cela signifie donc que la substance ne subit pas de r\u00e9actions chimiques et ne s&#039;oxyde pas. Il est toutefois important de noter que cette propri\u00e9t\u00e9 n&#039;est pas pr\u00e9sente dans tous les alliages d&#039;acier et est davantage caract\u00e9ristique de nuances exceptionnelles.<\/li>\n<li><strong>R\u00e9sistance \u00e0 la chaleur.<\/strong>\u00a0La r\u00e9sistance \u00e0 la chaleur caract\u00e9rise la capacit\u00e9 d&#039;un mat\u00e9riau \u00e0 ne pas s&#039;oxyder sous l&#039;influence de temp\u00e9ratures \u00e9lev\u00e9es et \u00e0 ne pas former de tartre ;<\/li>\n<li><strong>R\u00e9sistance \u00e0 la chaleur.<\/strong>\u00a0La r\u00e9sistance \u00e0 la chaleur d\u00e9termine la capacit\u00e9 d&#039;un alliage \u00e0 maintenir sa r\u00e9sistance \u00e0 haute temp\u00e9rature. Cela permet d&#039;utiliser l&#039;acier dans la fabrication de composants et de m\u00e9canismes soumis \u00e0 des contraintes thermiques.<\/li>\n<\/ul>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Propri\u00e9t\u00e9s technologiques de l&#039;acier<\/h3>\n<p>Les propri\u00e9t\u00e9s technologiques de l&#039;acier refl\u00e8tent la capacit\u00e9 d&#039;un m\u00e9tal ou d&#039;un alliage \u00e0 subir divers types de transformation. Parmi celles-ci, on peut citer\u00a0:<\/p>\n<ul>\n<li>Usinabilit\u00e9. Tous les aciers sont assez faciles \u00e0 usiner, aussi bien \u00e0 la main (avec une scie \u00e0 m\u00e9taux, un ciseau ou une lime) qu&#039;avec des machines-outils (per\u00e7age, tournage ou fraisage).<\/li>\n<li>Mall\u00e9abilit\u00e9. Cette propri\u00e9t\u00e9 est prise en compte lors du laminage, du forgeage et de l&#039;emboutissage. L&#039;acier pr\u00e9sente une assez bonne mall\u00e9abilit\u00e9 lorsqu&#039;il est chauff\u00e9.<\/li>\n<li>Soudabilit\u00e9. Ce proc\u00e9d\u00e9 s&#039;applique \u00e0 tous les types d&#039;acier.<\/li>\n<li>Fluidit\u00e9. Cette propri\u00e9t\u00e9 est essentielle \u00e0 la production de produits semi-finis, c&#039;est-\u00e0-dire de pi\u00e8ces moul\u00e9es ressemblant \u00e0 des pi\u00e8ces finies et ne n\u00e9cessitant qu&#039;un l\u00e9ger usinage suppl\u00e9mentaire.<\/li>\n<li>Trempabilit\u00e9. La trempabilit\u00e9 d\u00e9pend de la taille des pi\u00e8ces et des produits, ainsi que de la composition chimique de l&#039;acier. Pour accro\u00eetre cette trempabilit\u00e9, des composants d&#039;alliage tels que le chrome et le tungst\u00e8ne sont ajout\u00e9s \u00e0 l&#039;acier.<\/li>\n<li>R\u00e9sistance \u00e0 l&#039;usure. Pour accro\u00eetre cette r\u00e9sistance, les pi\u00e8ces frottantes (dents d&#039;engrenage) sont soumises \u00e0 un traitement thermique (trempe) et chimico-thermique (c\u00e9mentation, nitruration). Des \u00e9l\u00e9ments d&#039;alliage tels que le mangan\u00e8se et le silicium sont ajout\u00e9s \u00e0 l&#039;acier \u00e0 cette m\u00eame fin.<\/li>\n<li>R\u00e9sistance \u00e0 la corrosion. Pour accro\u00eetre cette r\u00e9sistance, on ajoute du nickel, du chrome et du titane \u00e0 l&#039;acier, ce qui produit des aciers dits inoxydables.<\/li>\n<\/ul>\n<h3>Propri\u00e9t\u00e9s m\u00e9caniques de l&#039;acier<\/h3>\n<ul>\n<li><strong>Force.<\/strong>\u00a0Capacit\u00e9 d&#039;un m\u00e9tal \u00e0 supporter des charges externes importantes. Cette propri\u00e9t\u00e9 est caract\u00e9ris\u00e9e par sa limite d&#039;\u00e9lasticit\u00e9 et sa r\u00e9sistance \u00e0 la traction.\n<ul>\n<li><strong>R\u00e9sistance \u00e0 la traction.<\/strong>\u00a0La contrainte m\u00e9canique maximale au-dessus de laquelle l&#039;acier se rompt.<\/li>\n<li><strong>Limite d&#039;\u00e9lasticit\u00e9.<\/strong>\u00a0Ce param\u00e8tre indique la contrainte m\u00e9canique au-dessus de laquelle le mat\u00e9riau continue de s&#039;allonger dans des conditions sans charge.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Plastique.<\/strong>\u00a0Capacit\u00e9 \u00e0 changer de forme sous charge et \u00e0 la conserver \u00e0 vide. Elle est quantifi\u00e9e par l&#039;allongement relatif et l&#039;angle de flexion.<\/li>\n<li><strong>R\u00e9sistance aux chocs.<\/strong>\u00a0Capacit\u00e9 d&#039;un m\u00e9tal \u00e0 r\u00e9sister aux charges dynamiques. Cette caract\u00e9ristique est \u00e9valu\u00e9e quantitativement par le travail n\u00e9cessaire \u00e0 la fracture d&#039;un \u00e9chantillon, divis\u00e9 par sa section transversale.<\/li>\n<li><strong>Duret\u00e9.<\/strong>\u00a0Capacit\u00e9 \u00e0 r\u00e9sister \u00e0 l&#039;impact d&#039;objets solides. Caract\u00e9ris\u00e9e quantitativement par la charge par surface d&#039;empreinte lorsqu&#039;elle est press\u00e9e avec une pyramide de diamant (m\u00e9thode Vickers) ou une bille d&#039;acier (m\u00e9thode Brinell).<\/li>\n<\/ul>\n<h3>Propri\u00e9t\u00e9s magn\u00e9tiques de l&#039;acier<\/h3>\n<p>Comme on le sait, presque tous les aciers (\u00e0 l\u2019exception de certains aciers inoxydables) sont magn\u00e9tiques.<\/p>\n<blockquote><p>Il convient de pr\u00e9ciser tout de suite que l\u2019acier inoxydable est en r\u00e9alit\u00e9 magn\u00e9tique.<\/p><\/blockquote>\n<p>Tous les aciers inoxydables ne sont pas magn\u00e9tiques, mais ils le sont tout de m\u00eame. Il n&#039;existe pas de r\u00e9ponse d\u00e9finitive, car les propri\u00e9t\u00e9s magn\u00e9tiques des alliages sont d\u00e9termin\u00e9es par les propri\u00e9t\u00e9s de leurs composants structurels. Ainsi, un type d&#039;acier inoxydable peut attirer un aimant, tandis qu&#039;un autre y est totalement indiff\u00e9rent. Alors, comment cela fonctionne-t-il\u00a0?<\/p>\n<p>Tout est une question de composition structurelle.<\/p>\n<p class=\"font_8\">La martensite, du point de vue des propri\u00e9t\u00e9s magn\u00e9tiques, est un ferromagn\u00e9tique pur.<\/p>\n<p class=\"font_8\">La ferrite peut pr\u00e9senter deux modifications. \u00c0 des temp\u00e9ratures inf\u00e9rieures au point de Curie, elle est, comme la martensite, ferromagn\u00e9tique. La ferrite delta \u00e0 haute temp\u00e9rature est paramagn\u00e9tique.<\/p>\n<p class=\"font_8\">Ainsi, les aciers r\u00e9sistants \u00e0 la corrosion dont la structure est constitu\u00e9e de martensite sont des aciers inoxydables magn\u00e9tiques. Ces alliages r\u00e9agissent \u00e0 un aimant comme l&#039;acier au carbone ordinaire. Les aciers ferritiques ou ferrito-martensitiques peuvent avoir des propri\u00e9t\u00e9s diff\u00e9rentes selon le rapport de leurs composants de phase, mais ils sont le plus souvent ferromagn\u00e9tiques.<\/p>\n<p>Par cons\u00e9quent, le chrome et certains alliages d\u2019acier inoxydable au chrome-nickel sont consid\u00e9r\u00e9s comme magn\u00e9tiques.<\/p>\n<p>Les alliages non magn\u00e9tiques comprennent les aciers au chrome-nickel et au chrome-mangan\u00e8se-nickel.<\/p>\n<p>Il est assez facile de d\u00e9terminer si l&#039;acier dont vous avez affaire est de l&#039;acier inoxydable v\u00e9ritable. Nettoyez la surface jusqu&#039;\u00e0 ce qu&#039;elle brille, puis appliquez et frottez deux ou trois gouttes d&#039;une solution concentr\u00e9e de sulfate de cuivre. Si la couche de cuivre transpara\u00eet (le sulfate devient une couche de cuivre), il ne s&#039;agit pas d&#039;acier inoxydable. En l&#039;absence de changement ou d&#039;impact, vous avez affaire \u00e0 de l&#039;acier inoxydable v\u00e9ritable.<\/p>\n<blockquote><p>Il est important de noter qu\u2019il est impossible de d\u00e9terminer \u00e0 la maison si l\u2019acier inoxydable est de qualit\u00e9 alimentaire.<\/p><\/blockquote>\n<p>Par cons\u00e9quent, vous ne devez pas utiliser de m\u00e9taux non test\u00e9s pour les ustensiles de cuisine.<\/p>\n<h4>Un peu plus sur les propri\u00e9t\u00e9s des aciers<\/h4>\n<p>L&#039;utilisation g\u00e9n\u00e9ralis\u00e9e du m\u00e9tal s&#039;explique par plusieurs caract\u00e9ristiques avantageuses, parmi lesquelles\u00a0: <strong>propri\u00e9t\u00e9s de l&#039;acier :<\/strong><\/p>\n<ul>\n<li>Capacit\u00e9 thermique sp\u00e9cifique \u00e0 20 \u00b0C : 462 J\/(kg \u00b0C) (110 cal\/(kg \u00b0C)) ;<\/li>\n<li>Densit\u00e9 : 7700-7900 kg\/m\u00b3 ;<\/li>\n<li>Point de fusion : 1450-1520 \u00b0C ;<\/li>\n<li>Densit\u00e9 : 75\u00a0500-77\u00a0500 N\/m\u00b3 (7\u00a0700-7\u00a0900 kgf\/m\u00b3 dans le syst\u00e8me MKGSS) ;<\/li>\n<li>Chaleur sp\u00e9cifique de fusion : 84 kJ\/kg (20 kcal\/kg, 23 W h\/kg) ;<\/li>\n<li>Le coefficient de conductivit\u00e9 thermique varie en fonction du type d&#039;acier et des impuret\u00e9s dans sa composition et peut aller de 15,5 W\/(m\u00b7K) \u00e0 54,4 W\/(m\u00b7K) ;<\/li>\n<li>Le coefficient de dilatation thermique lin\u00e9aire est compris entre 11,9 \u00b7 10<sup>-6 <\/sup>1\/<sup>0<\/sup>De 11,0 \u00e0 10<sup>-6 <\/sup>1\/<sup>0<\/sup>C et d\u00e9pend de la marque et des composants suppl\u00e9mentaires de l&#039;alliage.<\/li>\n<\/ul>\n<p>La r\u00e9sistance \u00e0 la traction est d\u00e9termin\u00e9e pour chaque type d&#039;acier s\u00e9par\u00e9ment et poss\u00e8de les indicateurs suivants, donn\u00e9s ci-dessous :<\/p>\n<ul>\n<li>Structurel 373-412 MPa;<\/li>\n<li>Silicium-chrome-mangan\u00e8se, utilis\u00e9 dans la fabrication d&#039;outils 1,52 GPa ;<\/li>\n<li>Ing\u00e9nierie du carbone 314-785 MPa ;<\/li>\n<li>Rail 690-785 MPa.<\/li>\n<\/ul>\n<p>Les propri\u00e9t\u00e9s du mat\u00e9riau varient \u00e9galement en fonction de la teneur en carbone. Voici les propri\u00e9t\u00e9s suivantes\u00a0: <strong>types d&#039;acier<\/strong>:<\/p>\n<ul>\n<li>faible teneur en carbone (moins de 0,25% de carbone) ;<\/li>\n<li>carbone moyen (0,3 \u2013 0,55% carbone) ;<\/li>\n<li>\u00e0 haute teneur en carbone (0,6 \u2013 2% carbone).<\/li>\n<\/ul>\n<p>Pour am\u00e9liorer l&#039;aptitude \u00e0 l&#039;emploi de l&#039;acier, on proc\u00e8de \u00e0 un alliage\u00a0: l&#039;ajout de m\u00e9taux \u00e0 l&#039;acier fondu modifie les propri\u00e9t\u00e9s de l&#039;alliage (augmentation de la r\u00e9sistance m\u00e9canique, de la conductivit\u00e9 \u00e9lectrique, de la r\u00e9sistance \u00e0 la corrosion, ainsi que des conductivit\u00e9s magn\u00e9tique et thermique). Le molybd\u00e8ne, l&#039;aluminium, le chrome, le nickel et plusieurs autres m\u00e9taux sont utilis\u00e9s comme m\u00e9taux d&#039;alliage. On distingue\u00a0: <strong>types d&#039;acier<\/strong> alli\u00e9:<\/p>\n<ul>\n<li>Faiblement alli\u00e9 \u2013 inclusions de m\u00e9taux d\u2019alliage ne d\u00e9passant pas 4% ;<\/li>\n<li>Moyennement alli\u00e9 \u2013 les m\u00e9taux d\u2019alliage ne constituent pas plus de 11% inclusions\u00a0;<\/li>\n<li>Alliage \u00e9lev\u00e9 \u2013 plus que 11%.<\/li>\n<\/ul>\n<h3>Nuances d&#039;acier<\/h3>\n<p><strong>Marquage de l&#039;acier selon GOST<\/strong> est produit par d\u00e9signation alphab\u00e9tique. Gr\u00e2ce \u00e0 l&#039;ordre des r\u00e8gles de d\u00e9signation, il est possible de conna\u00eetre et de lire <strong>marquages en acier <\/strong>Ce n&#039;est pas une t\u00e2che difficile avec de telles d\u00e9signations. Il existe un certain nombre de d\u00e9signations \u00e9tablies. <strong>marquage<\/strong> <strong>acier<\/strong> <strong>Par<\/strong> <strong>GOST<\/strong>:<\/p>\n<ul>\n<li>H \u2013 nickel;<\/li>\n<li>M \u2013 molybd\u00e8ne;<\/li>\n<li>T \u2013 titane;<\/li>\n<li>X \u2013 chrome;<\/li>\n<li>K \u2013 cobalt;<\/li>\n<li>B \u2013 tungst\u00e8ne;<\/li>\n<li>T \u2013 titane;<\/li>\n<li>D \u2013 cuivre;<\/li>\n<li>G \u2013 mangan\u00e8se;<\/li>\n<li>C \u2013 silicium;<\/li>\n<li>F \u2013 vanadium;<\/li>\n<li>R \u2013 bore;<\/li>\n<li>A \u2013 azote;<\/li>\n<li>B \u2013 niobium;<\/li>\n<li>E \u2013 s\u00e9l\u00e9nium;<\/li>\n<li>C \u2013 zirconium;<\/li>\n<li>U \u2013 aluminium;<\/li>\n<li>\u0427 \u2013 signifie la pr\u00e9sence de m\u00e9taux des terres rares.<\/li>\n<\/ul>\n<p>Pour d\u00e9signer diff\u00e9rents types en fonction de la composition et de la destination de l&#039;acier, les s\u00e9ries de d\u00e9signations de lettres suivantes sont utilis\u00e9es :<\/p>\n<ul>\n<li>PS \u2013 semi-calme ;<\/li>\n<li>KP \u2013 \u00e9bullition ;<\/li>\n<li>SP \u2013 calme.<\/li>\n<\/ul>\n<p>En cons\u00e9quence, en voyant les d\u00e9signations susmentionn\u00e9es dans le marquage de l&#039;alliage, nous pouvons d\u00e9terminer sa composition et comprendre quel type de mat\u00e9riau nous avons devant nous.<\/p>\n<p>Une bonne aide serait la table de marquage en acier<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1278 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/\u0442\u0430\u0431\u043b\u0438\u0446\u0430-\u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0438-\u0441\u0442\u0430\u043b\u0438.png\" alt=\"\" width=\"295\" height=\"171\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/\u0442\u0430\u0431\u043b\u0438\u0446\u0430-\u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0438-\u0441\u0442\u0430\u043b\u0438.png 295w, 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