{"id":85,"date":"2017-12-27T20:46:01","date_gmt":"2017-12-27T17:46:01","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=85"},"modified":"2020-11-02T12:08:45","modified_gmt":"2020-11-02T09:08:45","slug":"chugun-s-vermikulyarnym-grafitom","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/ghisa-a-grafite-vermicolare\/","title":{"rendered":"Ghisa vermicolare: caratteristiche, principio di produzione e caratteristiche tecniche"},"content":{"rendered":"<p><strong>Ghisa a grafite vermicolare - <\/strong>Si tratta di un metallo con propriet\u00e0 meccaniche superiori a quelle della ghisa grigia. La struttura di questa lega non contiene grafite lamellare, ma grafite sferoidale. La frazione in massa delle inclusioni di grafite sferoidale \u00e8 di circa 20%, mentre le inclusioni vermicolari costituiscono la maggior parte della componente di grafite, rappresentando circa 80% delle inclusioni totali di grafite.<\/p>\n<p><strong>Ghisa a grafite vermicolare<\/strong> Presenta propriet\u00e0 meccaniche superiori alla ghisa grigia, ma si colloca a met\u00e0 strada tra i materiali a grafite lamellare e sferoidale. Questo metallo (comunemente noto come ghisa a grafite vermicolare) \u00e8 pi\u00f9 facilmente fuso rispetto alla ghisa grigia.<\/p>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>Le inclusioni di grafite rendono il metallo pi\u00f9 resistente e duttile, migliorandone la resistenza ai carichi d&#039;urto. Inoltre, la lega presenta un&#039;elevata conduttivit\u00e0 termica, che la rende adatta all&#039;impiego nei circuiti degli impianti di riscaldamento. Pertanto, la combinazione di eccellenti propriet\u00e0 meccaniche e buona conduttivit\u00e0 termica consente a questa ghisa di essere utilizzata per getti destinati ad applicazioni soggette a fluttuazioni di temperatura.<\/p>\n<blockquote><p><strong>Ghisa a grafite vermicolare<\/strong> Si ottiene elaborando la fusione di metalli delle terre rare sotto forma di numerosi componenti di lega, che vengono introdotti nella siviera sul flusso di metallo.<\/p><\/blockquote>\n<p>Per prevenire la formazione di ledeburite o cementite nel prodotto finale, si esegue una modifica secondaria dopo il trattamento con elementi di lega, pi\u00f9 comunemente con ferrosilicio 75%. Questo tipo di ghisa viene fuso principalmente in stampi di sabbia. La tecnologia \u00e8 simile a quella utilizzata per le fusioni grigie, a temperature di 1360-1400 \u00b0C. Data la bassa sensibilit\u00e0 di questo metallo alle variazioni di spessore delle pareti, \u00e8 possibile produrre sezioni trasversali maggiori (circa 500 mm) mantenendo buone propriet\u00e0 meccaniche. <strong>Ghisa a grafite vermicolare<\/strong> Viene fuso in modo simile alla ghisa sferoidale. Questo metallo \u00e8 utilizzato nell&#039;ingegneria pesante e leggera, e trova impiego anche in molti componenti e blocchi di alloggiamenti (blocchi di motori a combustione interna, ecc.).<\/p>\n<h2>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h2>\n<h2>Marcatura della ghisa con grafite vermicolare secondo GOST<\/h2>\n<p>Secondo GOST, esistono quattro gradi principali di questa lega. Queste designazioni sono regolate dalla norma interstatale GOST 28394-89 &quot;Ghisa a grafite vermicolare per getti. Gradi&quot;. Questa norma distingue:<\/p>\n<ul>\n<li>ChVG 30;<\/li>\n<li>ChVG 35;<\/li>\n<li>ChVG 40;<\/li>\n<li>ChVG 45.<\/li>\n<\/ul>\n<p>L&#039;abbreviazione &quot;\u0427\u0412\u0413&quot; sta per ghisa a grafite compatta. I numeri nella designazione forniscono informazioni sulla resistenza minima alla trazione in condizioni di trazione. Ad esempio, \u0427\u0412\u0413 40 ha un valore di 400 MPa.<\/p>\n<p>Ulteriori informazioni sui principali marchi di CVG sono presentate nella tabella sottostante.<\/p>\n<p><strong><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-87 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/2753bdc842d7d4ae6577c609a44c6a32.webp\" alt=\"Ghisa a grafite vermicolare\" width=\"620\" height=\"444\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/2753bdc842d7d4ae6577c609a44c6a32.webp 620w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/2753bdc842d7d4ae6577c609a44c6a32-300x215.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/2753bdc842d7d4ae6577c609a44c6a32-254x182.webp 254w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/strong><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1177 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/\u0427\u0443\u0433\u0443\u043d-\u0441-\u0432\u0435\u0440\u043c\u0438\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u043c-\u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c-\u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438.webp\" alt=\"Caratteristiche della ghisa a grafite compatta\" width=\"620\" height=\"238\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/\u0427\u0443\u0433\u0443\u043d-\u0441-\u0432\u0435\u0440\u043c\u0438\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u043c-\u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c-\u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438.webp 620w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/\u0427\u0443\u0433\u0443\u043d-\u0441-\u0432\u0435\u0440\u043c\u0438\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u043c-\u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c-\u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438-300x115.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/\u0427\u0443\u0433\u0443\u043d-\u0441-\u0432\u0435\u0440\u043c\u0438\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u043c-\u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c-\u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438-254x98.webp 254w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La ghisa vermicolare \u00e8 un metallo le cui propriet\u00e0 meccaniche sono superiori a quelle della ghisa grigia\u2026<\/p>","protected":false},"author":1,"featured_media":87,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-85","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metalls"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0427\u0443\u0433\u0443\u043d \u0441 \u0432\u0435\u0440\u043c\u0438\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u043c \u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c \u0434\u043b\u044f \u043e\u0442\u043b\u0438\u0432\u043e\u043a, \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u0432\u043e\u0439\u0441\u0442\u0432, \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u043a\u0430\u0447\u0435\u0441\u0442\u0432, \u0441\u0444\u0435\u0440\u0430 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