{"id":802,"date":"2020-09-06T11:05:02","date_gmt":"2020-09-06T09:05:02","guid":{"rendered":"http:\/\/ghisa.kina.it\/?p=802"},"modified":"2021-10-27T10:23:30","modified_gmt":"2021-10-27T08:23:30","slug":"breve-storia-della-ghisa","status":"publish","type":"post","link":"https:\/\/www.ghisanativa.com\/it\/breve-storia-della-ghisa\/","title":{"rendered":"Breve storia della Ghisa"},"content":{"rendered":"\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Nel 1924 la tomba di Tutankhamon, in Egitto, ha restituito un prezioso pugnale della XVIII dinastia con fodero e manico d\u2019oro e lama di ferro. Eppure, nel XIV secolo a.C. i nostri antenati disponevano soltanto di tecnologie adatte alla fusione di rame, stagno, piombo e oro!<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1-768x1024.jpg\" alt=\"\" data-id=\"805\" data-full-url=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1.jpg\" data-link=\"https:\/\/www.ghisanativa.com\/?attachment_id=805\" class=\"wp-image-805\" srcset=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1-768x1024.jpg 768w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1-600x800.jpg 600w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1-225x300.jpg 225w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1-1152x1536.jpg 1152w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-1.jpg 1200w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2-768x1024.jpg\" alt=\"\" data-id=\"812\" data-full-url=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2.jpg\" data-link=\"https:\/\/www.ghisanativa.com\/?attachment_id=812\" class=\"wp-image-812\" srcset=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2-768x1024.jpg 768w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2-600x800.jpg 600w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2-225x300.jpg 225w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2-1152x1536.jpg 1152w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-2.jpg 1200w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Com\u2019\u00e8 possibile?<\/p>\n\n\n\n<p>Il mistero sta tutto nella provenienza di quel metallo, che non viene da una miniera ma dal cielo. \u00c8 una \u201croccia celeste\u201d che contiene il 10% di nickel e lo 0,6% di cobalto, percentuali riscontrabili solo nelle meteoriti e che conferiscono al metallo una eccezionale resistenza all\u2019ossidazione. Altri oggetti in ferro meteorico sono venuti alla luce in Egitto, tra cui alcune perle da collana risalenti al 3300 a.C. e anche in questo caso giunte fino a noi grazie all\u2019altissima percentuale di nickel. Per il ferro \u201cterrestre\u201d il discorso \u00e8 diverso e i manufatti antichi in questo metallo si \u201cdissolvono\u201d in tempi pi\u00f9 o meno lunghi a seconda delle condizioni atmosferiche.<\/p>\n\n\n\n<p>I pi\u00f9 antichi manufatti in ghisa giunti fino a noi sembrerebbero essere alcune piccole sfere venute alla luce nella provincia cinese di Henan e databili al sesto secolo prima di Cristo e riferibili alla dinastia Zhou.<\/p>\n\n\n\n<p>Ma la storia della ghisa era iniziata gi\u00e0 cinque secoli prima, alla fine dell\u2019et\u00e0 del Bronzo, quando i giacimenti a cielo aperto di rame e stagno \u2013 i metalli di cui \u00e8 composto il bronzo \u2013 iniziarono a scarseggiare.<\/p>\n\n\n\n<p>Si ricorse prima a un minerale presente nelle paludi, la limonite e pi\u00f9 tardi, in epoca etrusca, all\u2019ematite dell\u2019Isola d\u2019Elba.<\/p>\n\n\n\n<p>Lo stesso Virgilio nella sua \u201cEneide\u201d parla dell\u2019Elba \u2013 allora nota col nome di Ilva &#8211; definendola \u201cinexhaustis Chalybum generosa metallis\u201d, ovvero \u201cricca delle inesauribili miniere dei C\u00e0libi\u201d, essendo quest\u2019ultimi un popolo leggendario che Omero indica come l\u2019inventore della siderurgia del ferro.<\/p>\n\n\n\n<p>Portato a 1.100 gradi centigradi il metallo non si liquefaceva ma si separava dalla roccia formando una massa ricca di impurit\u00e0 che venivano eliminate con una lunga, vigorosa martellatura al fuoco della forgia, dove le particelle di carbonio emesse dalla legna si insinuavano tra le molecole del ferro aumentandone notevolmente la durezza.<\/p>\n\n\n\n<p>Si pu\u00f2 quindi dire che per entrare nell\u2019Era del Ferro, l\u2019uomo preistorico sia dovuto obbligatoriamente passare per quella della ghisa, ovvero ferro con un contenuto di carbonio compreso tra il 2 e il 6%.<\/p>\n\n\n\n<p>Nel Medioevo la ghisa entr\u00f2 prepotentemente nell\u2019industria bellica, finch\u00e9 tre secoli dopo, divenne il metallo indispensabile per costruire fabbriche, stazioni ferroviarie e ponti.<\/p>\n\n\n\n<p>Oggi la ghisa \u00e8 parte importante dell\u2019arredo urbano (panchine, scale, lampioni, chiusini), abbonda nelle abitazioni (scale, stufe e termosifoni) su treni, navi e autovetture.<\/p>\n\n\n\n<p>Senza scordare che in cucina, da secoli, ci rende la vita un po\u2019 pi\u00f9 comoda, piacevole, salutare e gustosa.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1280\" height=\"477\" src=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3.jpg\" alt=\"\" class=\"wp-image-820\" srcset=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3.jpg 1280w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3-600x224.jpg 600w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3-300x112.jpg 300w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3-1024x382.jpg 1024w, https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-3-768x286.jpg 768w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Nel 1924 la tomba di Tutankhamon, in Egitto, ha restituito un prezioso pugnale della XVIII dinastia con fodero e manico d\u2019oro e lama di ferro. Eppure, nel XIV secolo a.C. i nostri antenati disponevano soltanto di tecnologie adatte alla fusione di rame, stagno, piombo e oro!<\/p>\n","protected":false},"author":1,"featured_media":804,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26],"tags":[],"class_list":["post-802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ghisasophia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Breve storia della Ghisa - Ghisanativa<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ghisanativa.com\/it\/breve-storia-della-ghisa\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Breve storia della Ghisa - Ghisanativa\" \/>\n<meta property=\"og:description\" content=\"Nel 1924 la tomba di Tutankhamon, in Egitto, ha restituito un prezioso pugnale della XVIII dinastia con fodero e manico d\u2019oro e lama di ferro. Eppure, nel XIV secolo a.C. i nostri antenati disponevano soltanto di tecnologie adatte alla fusione di rame, stagno, piombo e oro!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ghisanativa.com\/it\/breve-storia-della-ghisa\/\" \/>\n<meta property=\"og:site_name\" content=\"Ghisanativa\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-06T09:05:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-10-27T08:23:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ghisanativa.com\/wp-content\/uploads\/2020\/09\/ghisanativa-breve-storia-ghisa-evidence.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"477\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"studiokina\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@studiokina\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"studiokina\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/\"},\"author\":{\"name\":\"studiokina\",\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/#\\\/schema\\\/person\\\/63a1bcc6d1eb0945c9339f1729cccc64\"},\"headline\":\"Breve storia della Ghisa\",\"datePublished\":\"2020-09-06T09:05:02+00:00\",\"dateModified\":\"2021-10-27T08:23:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/\"},\"wordCount\":454,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ghisanativa.com\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/ghisanativa-breve-storia-ghisa-evidence.jpg\",\"articleSection\":[\"Ghisasophia\"],\"inLanguage\":\"it-IT\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/\",\"url\":\"https:\\\/\\\/www.ghisanativa.com\\\/it\\\/breve-storia-della-ghisa\\\/\",\"name\":\"Breve storia della Ghisa - 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