{"id":80,"date":"2017-12-26T09:46:51","date_gmt":"2017-12-26T06:46:51","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=80"},"modified":"2020-11-02T12:09:14","modified_gmt":"2020-11-02T09:09:14","slug":"chugun-s-sharovidnym-grafitom","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/ghisa-nodulare\/","title":{"rendered":"Ghisa nodulare"},"content":{"rendered":"<p><strong>Ghisa nodulare <\/strong>Si tratta di un materiale strutturale ad alta resistenza con eccellenti caratteristiche prestazionali. Il magnesio viene aggiunto durante il processo di fusione, ottenendo una grafite colata che non ha la forma di una scaglia, ma piuttosto una forma sferica quasi perfetta. Il risultato <strong>ghisa nodulare<\/strong> Presenta qualit\u00e0 migliori rispetto al grigio e pu\u00f2 competere con l&#039;acciaio quando si confrontano alcune propriet\u00e0.<\/p>\n<p>Il processo di fusione della lega \u00e8 piuttosto semplice. Forse il metodo pi\u00f9 comune per produrre questo tipo di ghisa \u00e8 il processo al magnesio. La tecnologia prevede l&#039;aggiunta di leghe di magnesio e vari modificatori complessi contenenti magnesio al magnesio metallico fuso. Propriet\u00e0 <strong>ghisa a grafite sferoidale <\/strong>I vari tipi di materiali da fusione sono molteplici, ma si distinguono per l&#039;eccellente combinazione di propriet\u00e0 di fusione ed elevata resistenza. Questo materiale \u00e8 altamente duttile, il che lo rende facile da lavorare. \u00c8 abbastanza resistente a carichi variabili e ha una bassa sensibilit\u00e0 ai concentratori di stress. La struttura di base del metallo pu\u00f2 essere ferritica o perlitica. I materiali ferritici possono contenere fino a 20% di inclusioni di perlite, mentre i materiali perlitici possono contenere fino a 20% di ferrite.<\/p>\n<h2>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<\/h2>\n<h2>Gradi di ghisa nodulare<\/h2>\n<p>La tecnologia di marcatura per le ghise a grafite sferoidale segue uno specifico standard GOST e utilizza designazioni sia alfabetiche che numeriche. Ad esempio, la marcatura &quot;\u0412\u0427&quot; indica la ghisa ad alta resistenza, seguita da numeri che indicano la resistenza alla trazione. I dati sono forniti in MPa; per ottenere il valore completo, il valore specificato deve essere moltiplicato per 10.<\/p>\n<p>Il simbolo pu\u00f2 apparire cos\u00ec: \u0412\u042750 GOST 7293-85, il numero 50 indica la resistenza alla trazione di 500 MPa, \u0412\u042745 - resistenza alla trazione di 450 MPa, \u0412\u042780 - resistenza alla trazione di 800 MPa, ecc. L&#039;elenco\u00a0 <strong>gradi di ghisa a grafite sferoidale<\/strong> \u00c8 facile da tagliare, fonde a temperature pi\u00f9 basse e ha eccellenti propriet\u00e0 meccaniche e di fusione, solo leggermente peggiori dell&#039;acciaio. <strong>Gradi di ghisa nodulare <\/strong>\u0412\u0427100-4-3, \u0412\u0427110-6-5 hanno una resistenza alla trazione di 100-120 kgf\/mm<sup>2<\/sup> Conforme allo standard GOST 7293-70. Questi gradi sono utilizzati per la fusione di alberi motore, canne cilindro, alberi a camme e altri componenti soggetti a carichi elevati. I gradi ad alta resistenza VCh80 e 100 possono essere ottenuti tramite microlegatura seguita da normalizzazione della fusione.<\/p>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Ghisa ad alta resistenza con grafite sferoidale<\/h3>\n<p>Grazie al fatto che <strong>ghisa duttile con grafite nodulare<\/strong> La lega presenta inclusioni di grafite nodulari anzich\u00e9 lamellari ed \u00e8 caratterizzata da elevata resistenza, resistenza all&#039;usura e buone propriet\u00e0 meccaniche e di fusione. Per questo motivo, <strong>ghisa duttile con grafite nodulare <\/strong>Viene utilizzato con grande successo per la produzione di parti critiche nell&#039;ingegneria meccanica: alberi motore e alberi a camme, pistoni di motori diesel, bilancieri delle valvole, varie parti della frizione e altre strutture che operano sotto carichi elevati e variabili.<\/p>\n<p>Per le fusioni vengono utilizzati i seguenti gradi: VCh35, VCh40, VCh45, VCh50, VCh60, VCh70, VCh80 e VCh100. Viene inoltre utilizzato per la produzione di tubi ad alta resistenza per l&#039;approvvigionamento idrico, nonch\u00e9 di gasdotti e oleodotti. I tubi realizzati con questo materiale sono piuttosto resistenti, durevoli e caratterizzati da eccellenti propriet\u00e0 prestazionali. In base alle sue caratteristiche <strong>ghisa duttile con grafite nodulare <\/strong>corrisponde quasi completamente alla ghisa a grafite sferoidale.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-81 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-300x282.webp\" alt=\"Pistone diesel in ghisa nodulare\" width=\"300\" height=\"282\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-300x282.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-202x190.webp 202w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0.webp 514w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-82 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-300x154.webp\" alt=\"albero a camme in ghisa\" width=\"300\" height=\"154\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-300x154.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-768x395.webp 768w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1.webp 1024w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-254x131.webp 254w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La ghisa nodulare \u00e8 un materiale strutturale ad alta resistenza con ottime caratteristiche prestazionali\u2026.<\/p>","protected":false},"author":1,"featured_media":81,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-80","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metalls"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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