{"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\/it\/acciaio\/","title":{"rendered":"Acciaio: propriet\u00e0, marcature, standard GOST e tipi di acciaio"},"content":{"rendered":"<p>L&#039;acciaio, essendo uno dei metalli pi\u00f9 comuni, ha ricevuto oggi la pi\u00f9 ampia applicazione. Lavorazione e <a href=\"https:\/\/metallsmaster.pro\/it\/tutti-i-tipi-di-taglio-dei-metalli\/\">taglio<\/a> Questo materiale \u00e8 un compito che pu\u00f2 essere risolto utilizzando un&#039;ampia gamma di strumenti e tecnologie. <strong>Propriet\u00e0 dell&#039;acciaio <\/strong>consentono un&#039;elaborazione precisa e ad alta velocit\u00e0 utilizzando i seguenti tipi di elaborazione:<\/p>\n<ul>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/gilotina-po-metallu\/\">taglio meccanico<\/a>;<\/li>\n<li>getto d&#039;acqua;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/saldatura-ad-arco-di-argon\/\">arco di argon<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/saldatura-ad-arco-elettrico-dei-metalli\/\">arco elettrico<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/attrezzatura-per-il-taglio-del-gas\/\">gas<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/taglio-ad-arco-al-plasma\/\">plasma<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/it\/taglio-laser\/\">laser<\/a>.<\/li>\n<\/ul>\n<p>A seconda di <strong>gradi di acciaio<\/strong> e per ottenere i risultati desiderati, utilizzare la tecnologia di lavorazione dei metalli pi\u00f9 appropriata.<\/p>\n<h2>Propriet\u00e0 dell&#039;acciaio<\/h2>\n<p>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<br \/>\nEsistono 4 principali aree di indicatori che distinguono l&#039;acciaio e le sue leghe.<\/p>\n<p>Tra queste aree:<\/p>\n<ul>\n<li>propriet\u00e0 chimiche dell&#039;acciaio;<\/li>\n<li>tecnologico;<\/li>\n<li>propriet\u00e0 meccaniche dell&#039;acciaio;<\/li>\n<li>propriet\u00e0 magnetiche dell&#039;acciaio.<\/li>\n<\/ul>\n<p>Ora parliamo di ognuno di essi pi\u00f9 nel dettaglio.<\/p>\n<h3>Propriet\u00e0 chimiche dell&#039;acciaio<\/h3>\n<ul>\n<li><strong>Ossidabilit\u00e0.<\/strong>\u00a0Questa \u00e8 una misura della capacit\u00e0 di combinarsi con l&#039;ossigeno. L&#039;ossidazione aumenta con l&#039;aumentare della temperatura del metallo. Gli acciai a basso tenore di carbonio si ossidano formando ruggine (ossidi di ferro) quando esposti all&#039;acqua o all&#039;aria umida;<\/li>\n<li><strong>Resistenza alla corrosione.\u00a0<\/strong>Ci\u00f2 significa che la sostanza non subisce reazioni chimiche e non si ossida. Tuttavia, \u00e8 importante notare che questa propriet\u00e0 non \u00e8 presente in tutte le leghe di acciaio ed \u00e8 pi\u00f9 tipica di gradi eccezionali;<\/li>\n<li><strong>Resistenza al calore.<\/strong>\u00a0La resistenza al calore caratterizza la capacit\u00e0 di un materiale di non ossidarsi sotto l&#039;influenza di alte temperature e di non formare incrostazioni;<\/li>\n<li><strong>Resistenza al calore.<\/strong>\u00a0La resistenza al calore determina la capacit\u00e0 di una lega di mantenere la propria resistenza alle alte temperature. Ci\u00f2 consente all&#039;acciaio di essere utilizzato nella creazione di componenti e meccanismi soggetti a stress termico.<\/li>\n<\/ul>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Propriet\u00e0 tecnologiche dell&#039;acciaio<\/h3>\n<p>Le propriet\u00e0 tecnologiche dell&#039;acciaio riflettono la capacit\u00e0 di un metallo o di una lega di subire diversi tipi di lavorazione. Tra queste:<\/p>\n<ul>\n<li>Lavorabilit\u00e0. Tutti gli acciai sono piuttosto facili da lavorare, sia a mano (con un seghetto, uno scalpello o una lima) sia con macchine utensili (foratura, tornitura o fresatura).<\/li>\n<li>Malleabilit\u00e0. Questa propriet\u00e0 viene presa in considerazione durante la laminazione, la forgiatura e lo stampaggio. L&#039;acciaio mostra una discreta malleabilit\u00e0 quando riscaldato.<\/li>\n<li>Saldabilit\u00e0. Questo processo \u00e8 applicabile a tutti i tipi di acciaio.<\/li>\n<li>Fluidit\u00e0. Questa propriet\u00e0 \u00e8 essenziale per la produzione di prodotti semilavorati, ovvero getti che assomigliano a parti finite e richiedono solo piccole lavorazioni successive.<\/li>\n<li>Temprabilit\u00e0. La temprabilit\u00e0 dipende dalle dimensioni dei pezzi e dei prodotti, nonch\u00e9 dalla composizione chimica dell&#039;acciaio. Per aumentare la temprabilit\u00e0, all&#039;acciaio vengono aggiunti componenti di lega come cromo e tungsteno.<\/li>\n<li>Resistenza all&#039;usura. Per aumentare la resistenza all&#039;usura, le parti in attrito (denti degli ingranaggi) vengono sottoposte a trattamento termico (tempra) e chimico-termico (cementazione, nitrurazione). Allo stesso scopo, all&#039;acciaio vengono aggiunti elementi di lega come manganese e silicio.<\/li>\n<li>Resistenza alla corrosione. Per aumentare questa resistenza, all&#039;acciaio vengono aggiunti nichel, cromo e titanio, producendo i cosiddetti acciai inossidabili.<\/li>\n<\/ul>\n<h3>Propriet\u00e0 meccaniche dell&#039;acciaio<\/h3>\n<ul>\n<li><strong>Forza.<\/strong>\u00a0Capacit\u00e0 di un metallo di resistere a carichi esterni significativi. Questa propriet\u00e0 \u00e8 caratterizzata dal limite di snervamento e dalla resistenza alla trazione.\n<ul>\n<li><strong>Resistenza alla trazione.<\/strong>\u00a0La massima sollecitazione meccanica oltre la quale l&#039;acciaio si rompe.<\/li>\n<li><strong>Limite di snervamento.<\/strong>\u00a0Questo parametro indica lo stress meccanico oltre il quale il materiale continua ad allungarsi in condizioni di assenza di carico.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Plastica.<\/strong>\u00a0Capacit\u00e0 di cambiare forma sotto carico e di mantenerla quando non \u00e8 sotto carico. \u00c8 quantificata dall&#039;allungamento relativo e dall&#039;angolo di piegatura;<\/li>\n<li><strong>Resistenza all&#039;impatto.<\/strong>\u00a0Capacit\u00e0 di un metallo di resistere a carichi dinamici. Questa caratteristica \u00e8 valutata quantitativamente dal lavoro necessario per fratturare un campione, diviso per la sua sezione trasversale;<\/li>\n<li><strong>Durezza.<\/strong>\u00a0Capacit\u00e0 di resistere all&#039;impatto di oggetti solidi. \u00c8 caratterizzata quantitativamente dal carico per area dell&#039;impronta quando viene premuta con una piramide di diamante (metodo Vickers) o una sfera d&#039;acciaio (metodo Brinell).<\/li>\n<\/ul>\n<h3>Propriet\u00e0 magnetiche dell&#039;acciaio<\/h3>\n<p>Come \u00e8 noto, quasi tutti gli acciai (tranne alcuni acciai inossidabili) sono magnetici.<\/p>\n<blockquote><p>Vale la pena dire subito che l&#039;acciaio inossidabile \u00e8 in realt\u00e0 magnetico.<\/p><\/blockquote>\n<p>Non tutto l&#039;acciaio inossidabile \u00e8 magnetico, ma lo \u00e8 comunque. Non esiste una dichiarazione definitiva, poich\u00e9 le propriet\u00e0 magnetiche delle leghe sono determinate dalle propriet\u00e0 dei loro componenti strutturali. Pertanto, un tipo di acciaio inossidabile pu\u00f2 attrarre con successo una calamita, mentre un altro \u00e8 completamente indifferente. Quindi, come funziona?<\/p>\n<p>Tutto ruota attorno alla composizione strutturale.<\/p>\n<p class=\"font_8\">Dal punto di vista delle propriet\u00e0 magnetiche, la martensite \u00e8 un ferromagnete puro.<\/p>\n<p class=\"font_8\">La ferrite pu\u00f2 avere due varianti. A temperature inferiori al punto di Curie, come la martensite, \u00e8 ferromagnetica. La ferrite delta ad alta temperatura \u00e8 paramagnetica.<\/p>\n<p class=\"font_8\">Pertanto, gli acciai resistenti alla corrosione la cui struttura \u00e8 costituita da martensite sono acciai inossidabili magnetici. Queste leghe reagiscono a un magnete come il comune acciaio al carbonio. Gli acciai ferritici o ferritico-martensitici possono avere propriet\u00e0 diverse a seconda del rapporto tra le loro componenti di fase, ma sono pi\u00f9 spesso ferromagnetici.<\/p>\n<p>Di conseguenza, il cromo e alcune leghe di acciaio inossidabile al cromo-nichel sono considerati magnetici.<\/p>\n<p>Le leghe non magnetiche includono gli acciai al cromo-nichel e al cromo-manganese-nichel.<\/p>\n<p>\u00c8 abbastanza facile stabilire se l&#039;acciaio con cui hai a che fare \u00e8 autentico acciaio inossidabile. Pulisci la superficie fino a farla brillare, quindi applica e strofina due o tre gocce di una soluzione concentrata di solfato di rame. Se il rivestimento di rame \u00e8 visibile (il solfato diventa un rivestimento di rame), non \u00e8 acciaio inossidabile. Se non si notano cambiamenti o impatti, si tratta di autentico acciaio inossidabile.<\/p>\n<blockquote><p>\u00c8 importante notare che \u00e8 impossibile stabilire a casa se l&#039;acciaio inossidabile \u00e8 idoneo all&#039;uso alimentare.<\/p><\/blockquote>\n<p>Per questo motivo, non si dovrebbero utilizzare metalli non testati per gli utensili da cucina.<\/p>\n<h4>Un po&#039; di pi\u00f9 sulle propriet\u00e0 degli acciai<\/h4>\n<p>L&#039;ampio utilizzo del metallo \u00e8 dovuto a una serie di caratteristiche vantaggiose. Tra queste: <strong>propriet\u00e0 dell&#039;acciaio:<\/strong><\/p>\n<ul>\n<li>Capacit\u00e0 termica specifica a 20 \u00b0C: 462 J\/(kg \u00b0C) (110 cal\/(kg \u00b0C));<\/li>\n<li>Densit\u00e0: 7700-7900 kg\/m\u00b3;<\/li>\n<li>Punto di fusione: 1450-1520 \u00b0C;<\/li>\n<li>Peso specifico: 75500-77500 N\/m\u00b3 (7700-7900 kgf\/m\u00b3 nel sistema MKGSS);<\/li>\n<li>Calore specifico di fusione: 84 kJ\/kg (20 kcal\/kg, 23 W h\/kg);<\/li>\n<li>Il coefficiente di conduttivit\u00e0 termica varia a seconda del tipo di acciaio e delle impurit\u00e0 presenti nella sua composizione e pu\u00f2 variare da 15,5 W\/(m K) a 54,4 W\/(m K);<\/li>\n<li>Il coefficiente di dilatazione lineare termica \u00e8 compreso nell&#039;intervallo 11,9 \u00b7 10<sup>-6 <\/sup>1\/<sup>0<\/sup>Da 11.0 a 10<sup>-6 <\/sup>1\/<sup>0<\/sup>C e dipende dalla marca e dai componenti aggiuntivi della lega.<\/li>\n<\/ul>\n<p>La resistenza alla trazione viene determinata separatamente per ogni tipo di acciaio e presenta i seguenti indicatori, riportati di seguito:<\/p>\n<ul>\n<li>Strutturale 373-412 MPa;<\/li>\n<li>Silicio-cromo-manganese, utilizzato nella produzione di utensili 1,52 GPa;<\/li>\n<li>Ingegneria del carbonio 314-785 MPa;<\/li>\n<li>Rotaia 690-785 MPa.<\/li>\n<\/ul>\n<p>Le propriet\u00e0 del materiale cambiano anche a seconda del contenuto di carbonio. Esistono le seguenti <strong>tipi di acciaio<\/strong>:<\/p>\n<ul>\n<li>basso tenore di carbonio (meno di 0,25% di carbonio);<\/li>\n<li>carbonio medio (0,3 \u2013 0,55% carbonio);<\/li>\n<li>ad alto tenore di carbonio (0,6 \u2013 2% carbonio).<\/li>\n<\/ul>\n<p>Per aumentare l&#039;utilizzabilit\u00e0 dell&#039;acciaio, si ricorre alla legatura: l&#039;aggiunta di metalli all&#039;acciaio fuso ne altera le propriet\u00e0 (aumentandone la resistenza meccanica, la conduttivit\u00e0 elettrica, la resistenza alla corrosione e la conduttivit\u00e0 magnetica e termica). Molibdeno, alluminio, cromo, nichel e molti altri metalli vengono utilizzati come leganti. Si distinguono i seguenti: <strong>tipi di acciaio<\/strong> legato:<\/p>\n<ul>\n<li>Bassamente legati \u2013 inclusioni di metalli di lega non superiori a 4%;<\/li>\n<li>Mediamente legati: i metalli di lega non contengono pi\u00f9 di 111 inclusioni TP3T;<\/li>\n<li>Altolegato \u2013 pi\u00f9 di 11%.<\/li>\n<\/ul>\n<h3>Gradi di acciaio<\/h3>\n<p><strong>Marcatura dell&#039;acciaio secondo GOST<\/strong> \u00e8 prodotto dalla designazione delle lettere. Grazie all&#039;ordine delle regole di designazione, \u00e8 possibile conoscere e leggere <strong>marcature in acciaio <\/strong>Non \u00e8 un compito difficile con tali designazioni. Esistono diverse designazioni consolidate che vengono utilizzate <strong>marcatura<\/strong> <strong>acciaio<\/strong> <strong>Di<\/strong> <strong>GOST<\/strong>:<\/p>\n<ul>\n<li>H \u2013 nichel;<\/li>\n<li>M \u2013 molibdeno;<\/li>\n<li>T \u2013 titanio;<\/li>\n<li>X \u2013 cromo;<\/li>\n<li>K \u2013 cobalto;<\/li>\n<li>B \u2013 tungsteno;<\/li>\n<li>T \u2013 titanio;<\/li>\n<li>D \u2013 rame;<\/li>\n<li>G \u2013 manganese;<\/li>\n<li>C \u2013 silicio;<\/li>\n<li>F \u2013 vanadio;<\/li>\n<li>R \u2013 boro;<\/li>\n<li>A \u2013 azoto;<\/li>\n<li>B \u2013 niobio;<\/li>\n<li>E \u2013 selenio;<\/li>\n<li>C \u2013 zirconio;<\/li>\n<li>U \u2013 alluminio;<\/li>\n<li>\u0427 \u2013 indica la presenza di metalli delle terre rare.<\/li>\n<\/ul>\n<p>Per designare i diversi tipi a seconda della composizione e dello scopo dell&#039;acciaio, vengono utilizzate le seguenti serie di designazioni tramite lettere:<\/p>\n<ul>\n<li>PS \u2013 semi-calmo;<\/li>\n<li>KP \u2013 ebollizione;<\/li>\n<li>SP \u2013 calma.<\/li>\n<\/ul>\n<p>Di conseguenza, osservando le designazioni sopra menzionate nella marcatura della lega, possiamo determinarne la composizione e capire che tipo di materiale abbiamo di fronte.<\/p>\n<p>Un buon aiuto potrebbe essere la tabella di marcatura dell&#039;acciaio<\/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, 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\u0438-254x147.png 254w\" sizes=\"auto, (max-width: 295px) 100vw, 295px\" \/><strong><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-168 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main.webp\" alt=\"applicazione dell&#039;acciaio\" width=\"660\" height=\"325\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main.webp 660w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main-300x148.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main-254x125.webp 254w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/strong><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>L&#039;acciaio, essendo uno dei metalli pi\u00f9 comuni, \u00e8 quello che oggi ha trovato la pi\u00f9 ampia applicazione...<\/p>","protected":false},"author":1,"featured_media":166,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-165","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=\"\u0421\u0442\u0430\u043b\u044c, \u0435\u0435 \u0442\u0438\u043f\u044b \u0438 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438, \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0445 \u0441\u0432\u043e\u0439\u0441\u0442\u0432 \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u043c\u0435\u0442\u0430\u043b\u043b\u0430 \u0438 \u0435\u0433\u043e \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430, 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