{"id":552,"date":"2019-02-01T12:36:16","date_gmt":"2019-02-01T09:36:16","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=552"},"modified":"2020-11-02T11:42:52","modified_gmt":"2020-11-02T08:42:52","slug":"sredneuglerodistaya-stal","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/fr\/acier-au-carbone-moyen\/","title":{"rendered":"Acier \u00e0 moyen carbone : nuances, propri\u00e9t\u00e9s et caract\u00e9ristiques des alliages"},"content":{"rendered":"<p>L&#039;acier \u00e0 teneur moyenne en carbone est un acier sans \u00e9l\u00e9ments d&#039;alliage, dont la teneur en carbone est comprise entre 0,25 et 0,61 TP3T et qui contient des impuret\u00e9s constantes. Cet alliage est class\u00e9 comme acier de qualit\u00e9 standard, fondu dans des fours \u00e0 oxyg\u00e8ne basiques, et est consid\u00e9r\u00e9 comme peu co\u00fbteux en raison de ses co\u00fbts de production relativement faibles. Ses propri\u00e9t\u00e9s m\u00e9caniques sont nettement inf\u00e9rieures \u00e0 celles des autres alliages.<\/p>\n<p>Ce type d&#039;acier est \u00e9galement consid\u00e9r\u00e9 comme un acier durcissable, ce qui signifie qu&#039;il n\u00e9cessite un traitement thermique suppl\u00e9mentaire, notamment une trempe et un revenu \u00e0 haute temp\u00e9rature. L&#039;acier \u00e0 teneur moyenne en carbone peut \u00eatre alli\u00e9, ce qui lui conf\u00e8re des propri\u00e9t\u00e9s m\u00e9caniques uniques. L&#039;ajout de mangan\u00e8se augmente la r\u00e9sistance de l&#039;acier et lui conf\u00e8re une \u00e9lasticit\u00e9 \u00e9lev\u00e9e\u00a0; ces propri\u00e9t\u00e9s sont acquises apr\u00e8s trempe, revenu et parfois normalisation. L&#039;ajout de chrome et de nickel augmente la r\u00e9sistance, la t\u00e9nacit\u00e9 et d&#039;autres propri\u00e9t\u00e9s de mise en \u0153uvre. Les alliages de cette classe pr\u00e9sentent une trempabilit\u00e9 profonde.<\/p>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>L&#039;acier faiblement alli\u00e9 \u00e0 teneur moyenne en carbone est utilis\u00e9 en construction m\u00e9canique apr\u00e8s traitement thermique, trempe et revenu. Certaines nuances sont \u00e9galement revenues et normalis\u00e9es. Cela permet la fabrication de pi\u00e8ces soumises \u00e0 des frottements relativement \u00e9lev\u00e9s, avec vibrations et charges statiques \u00e9lev\u00e9es. L&#039;acier de construction \u00e0 teneur moyenne en carbone est utilis\u00e9 avec succ\u00e8s pour les pi\u00e8ces m\u00e9caniques, mais n\u00e9cessite des am\u00e9liorations. Il est notamment utilis\u00e9 pour la fabrication d&#039;embrayages de freins fonctionnant \u00e0 sec et de pi\u00e8ces soumises \u00e0 des frottements importants.<\/p>\n<p>Cet alliage, qui conserve durablement sa duret\u00e9 \u00e9lev\u00e9e et ses excellentes propri\u00e9t\u00e9s de coupe, est utilis\u00e9 dans la fabrication d&#039;outils de coupe. Sa teneur en silicium augmente la r\u00e9sistance tout en r\u00e9duisant la t\u00e9nacit\u00e9, ce qui r\u00e9duit la trempabilit\u00e9 des pi\u00e8ces. Ce type d&#039;alliage est utilis\u00e9 pour la fabrication de ressorts. La pr\u00e9sence de chrome et de mangan\u00e8se dans l&#039;acier \u00e0 teneur moyenne en carbone augmente \u00e9galement la r\u00e9sistance m\u00e9canique et la r\u00e9sistance \u00e0 l&#039;usure. Soudable, ce m\u00e9tal est id\u00e9al pour la cr\u00e9ation de structures ou de composants soud\u00e9s durables.<\/p>\n<h2>Nuances d&#039;acier \u00e0 teneur moyenne en carbone<\/h2>\n<blockquote><p>Les nuances d&#039;acier \u00e0 moyen carbone sont r\u00e9glement\u00e9es par les normes GOST : GOST 1050-75, GOST 380-71.<\/p><\/blockquote>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>Selon les normes \u00e9tablies, tous les alliages sont divis\u00e9s en groupes :<\/p>\n<ul>\n<li>A - fourni selon les propri\u00e9t\u00e9s m\u00e9caniques ;<\/li>\n<li>B - par composition chimique ;<\/li>\n<li>B \u2013 selon les propri\u00e9t\u00e9s m\u00e9caniques, mais en tenant compte des exigences individuelles en mati\u00e8re de composition chimique.<\/li>\n<\/ul>\n<p>Les nuances d&#039;acier \u00e0 moyen carbone du groupe A portent les noms suivants :<\/p>\n<ul>\n<li>Art. 0;<\/li>\n<li>Art. 1;<\/li>\n<li>Art. 2;<\/li>\n<li>Art. 3;<\/li>\n<li>Art. 4;<\/li>\n<li>Art. 5;<\/li>\n<li>Art. 6;<\/li>\n<li>Art. 7.<\/li>\n<\/ul>\n<p>Si l&#039;alliage est bouillant, l&#039;abr\u00e9viation \u00ab kp \u00bb est indiqu\u00e9e, semi-calm\u00e9 \u2013 \u00ab ps \u00bb, en l&#039;absence d&#039;abr\u00e9viation, il faut supposer que l&#039;acier est cal\u00e9.<\/p>\n<blockquote><p>Les nuances d&#039;acier \u00e0 teneur moyenne en carbone du groupe B sont produites \u00e0 l&#039;aide de m\u00e9thodes de conversion, de Bessemer et de four ouvert.<\/p><\/blockquote>\n<p>Lors du marquage, la m\u00e9thode de production est indiqu\u00e9e par une abr\u00e9viation de lettre :<\/p>\n<ul>\n<li>&quot;M&quot; - foyer ouvert;<\/li>\n<li>\u00ab B \u00bb Bessemer;<\/li>\n<li>Enveloppe &quot;K&quot;.<\/li>\n<\/ul>\n<p>Pour le groupe d&#039;acier Bessemer B, il est d&#039;usage de produire uniquement les nuances suivantes : BSt. O, BSt. 3, BSt. 4, BSt. 5, BSt. 6.<\/p>\n<p>Les nuances d&#039;acier \u00e0 moyen carbone du groupe B sont produites par les proc\u00e9d\u00e9s de conversion et de four \u00e0 sole. Les nuances suivantes sont accept\u00e9es pour l&#039;acier four \u00e0 sole du groupe B\u00a0: VMSt. 2, VMSt. 3, VMSt. 4, VMSt. 5. Pour l&#039;acier de conversion du groupe B, les m\u00eames nuances sont d\u00e9sign\u00e9es par la lettre \u00ab\u00a0K\u00a0\u00bb (VKSt. 2, VKSt. 3).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-553 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c.webp\" alt=\"Acier \u00e0 teneur moyenne en carbone\" width=\"688\" height=\"417\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c.webp 688w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c-300x182.webp 300w, 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