{"id":6274,"date":"2026-09-19T12:36:40","date_gmt":"2026-09-19T12:36:40","guid":{"rendered":"https:\/\/beiyutitanium.com\/titanium-hardness-by-grade\/"},"modified":"2026-09-19T12:36:40","modified_gmt":"2026-09-19T12:36:40","slug":"titanium-hardness-by-grade","status":"publish","type":"post","link":"https:\/\/beiyutitanium.com\/it\/titanium-hardness-by-grade\/","title":{"rendered":"Durezza del titanio per qualit\u00e0: valori Rockwell, Brinell e Vickers"},"content":{"rendered":"<p>La durezza del titanio dipende dalla qualit\u00e0. Le qualit\u00e0 non legate si collocano sulla scala Rockwell B, da 70 HRB per il Grade 1 a 100 HRB per il Grade 4, mentre le leghe Grade 9, Grade 5 e Grade 23 passano alla scala Rockwell C, con il Grade 5 a un nominale di 33 HRC nella guida RMI Titanium Company <em>Guida alle leghe di titanio<\/em>. Sono valori tipici, non limiti: n\u00e9 ASTM B265 n\u00e9 ASTM B348 fissano un requisito di durezza, quindi un valore di durezza diventa un dato verificato solo quando l\u2019ordine lo richiede.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/beiyutitanium.com\/wp-content\/uploads\/2026\/08\/titanium-bar-diameter-measurement-1024x683.jpg\" alt=\"Digital micrometer reading titanium bar diameter on a granite surface plate\" width=\"1024\" height=\"683\" \/><figcaption>Micrometro digitale che misura il diametro di una barra di titanio su un piano di riscontro in granito<\/figcaption><\/figure>\n<h2>Durezza del titanio per qualit\u00e0<\/h2>\n<p>I valori nominali riportati di seguito provengono dalle schede tecniche per qualit\u00e0 di un\u2019unica pubblicazione, la RMI <em>Guida alle leghe di titanio<\/em> (gennaio 2000), cos\u00ec che ogni riga poggi sulla stessa base. Dove una scheda tecnica Beiyu Titanium riporta un proprio valore tipico per la stessa qualit\u00e0, questo \u00e8 indicato nell\u2019ultima colonna anzich\u00e9 unito agli altri, perch\u00e9 si tratta di valori tipici provenienti da due pubblicazioni e, per il Grade 2, su scale diverse.<\/p>\n<table>\n<tr>\n<th>Grado<\/th>\n<th>UNS<\/th>\n<th>Durezza nominale RMI<\/th>\n<th>Valore tipico della scheda tecnica Beiyu<\/th>\n<\/tr>\n<tr>\n<td>Grade 1<\/td>\n<td>R50250<\/td>\n<td>70 HRB<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 2<\/td>\n<td>R50400<\/td>\n<td>82 HRB<\/td>\n<td>Circa 150 HB, oppure da 160 a 200 HV<\/td>\n<\/tr>\n<tr>\n<td>Grade 3<\/td>\n<td>R50550<\/td>\n<td>90 HRB<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 4<\/td>\n<td>R50700<\/td>\n<td>100 HRB<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 7<\/td>\n<td>R52400<\/td>\n<td>82 HRB<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 12<\/td>\n<td>R53400<\/td>\n<td>88 HRB<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 9<\/td>\n<td>R56320<\/td>\n<td>25 HRC<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 23<\/td>\n<td>R56407<\/td>\n<td>32 HRC<\/td>\n<td>Non pubblicato<\/td>\n<\/tr>\n<tr>\n<td>Grade 5<\/td>\n<td>R56400<\/td>\n<td>33 HRC<\/td>\n<td>da 30 a 36 HRC allo stato ricotto, circa 330 HV o 334 HB; circa da 35 a 39 HRC dopo trattamento di solubilizzazione e invecchiamento<\/td>\n<\/tr>\n<\/table>\n<p>The UNS numbers are given for cross-reference; ASTM B348 itself identifies material by grade number only. Grade 23 is listed as R56407, and R56401 is the number ASTM F136 gives the implant form of the same alloy. The Grade 5 row is where the two sources can be read against each other on one scale: RMI&#8217;s nominal 33 HRC falls inside the 30 to 36 HRC annealed range on the <a href=\"https:\/\/beiyutitanium.com\/it\/grade-5-titanium-ti-6al-4v-uns-r56400\/\">scheda tecnica Grade 5<\/a>.<\/p>\n<h2>Durezza e limite di ossigeno nelle qualit\u00e0 non legate<\/h2>\n<p>Le quattro qualit\u00e0 non legate non sono quattro purezze di un unico metallo nel senso generico del termine. Si distinguono per i loro limiti di ossigeno, azoto e ferro, e i valori di durezza RMI crescono nello stesso ordine del limite di ossigeno.<\/p>\n<table>\n<tr>\n<th>Grado<\/th>\n<th>Ossigeno, max (% in peso)<\/th>\n<th>Azoto, max (% in peso)<\/th>\n<th>Ferro, max (% in peso)<\/th>\n<th>Durezza nominale RMI<\/th>\n<\/tr>\n<tr>\n<td>Grade 1<\/td>\n<td>0.18<\/td>\n<td>0.03<\/td>\n<td>0.20<\/td>\n<td>70 HRB<\/td>\n<\/tr>\n<tr>\n<td>Grade 2<\/td>\n<td>0.25<\/td>\n<td>0.03<\/td>\n<td>0.30<\/td>\n<td>82 HRB<\/td>\n<\/tr>\n<tr>\n<td>Grade 3<\/td>\n<td>0.35<\/td>\n<td>0.05<\/td>\n<td>0.30<\/td>\n<td>90 HRB<\/td>\n<\/tr>\n<tr>\n<td>Grade 4<\/td>\n<td>0.40<\/td>\n<td>0.05<\/td>\n<td>0.50<\/td>\n<td>100 HRB<\/td>\n<\/tr>\n<\/table>\n<p>Per l\u2019acquirente la lettura pratica \u00e8 che scegliere tra Grade 1 e Grade 4 significa anche scegliere tra la pi\u00f9 tenera e la pi\u00f9 dura della famiglia delle qualit\u00e0 non legate.<\/p>\n<h2>Leggere HRB, HRC, HB e HV affiancati<\/h2>\n<p>Un valore sulla scala Rockwell B e uno sulla scala Rockwell C, Brinell o Vickers non sono lo stesso numero espresso in unit\u00e0 diverse. Nella guida RMI le qualit\u00e0 non legate, il Grade 7 e il Grade 12 sono riportati su Rockwell B, mentre le leghe Grade 9, Grade 5 e Grade 23 su Rockwell C, ed \u00e8 qui che la tabella sopra cambia scala. La conversione tra scale richiede una base di conversione concordata per il materiale; un limite su un disegno deve quindi indicare la scala su cui \u00e8 scritto, e la prova deve essere eseguita su quella scala.<\/p>\n<table>\n<tr>\n<th>Scala<\/th>\n<th>Dove compare nelle fonti per qualit\u00e0 utilizzate qui<\/th>\n<\/tr>\n<tr>\n<td>HRB (Rockwell B)<\/td>\n<td>Qualit\u00e0 non legate e Grade 7 e Grade 12 nella guida RMI<\/td>\n<\/tr>\n<tr>\n<td>HRC (Rockwell C)<\/td>\n<td>Grade 5, Grade 9 e Grade 23 nella guida RMI; Grade 5 sulla scheda tecnica Beiyu<\/td>\n<\/tr>\n<tr>\n<td>HB (Brinell)<\/td>\n<td>Schede tecniche Beiyu per Grade 2 e Grade 5<\/td>\n<\/tr>\n<tr>\n<td>HV (Vickers)<\/td>\n<td>Schede tecniche Beiyu per Grade 2 e Grade 5<\/td>\n<\/tr>\n<\/table>\n<p>La durezza Mohs, la scala di scalfittura usata per i minerali, non compare per nessuna qualit\u00e0 in nessuna delle due fonti.<\/p>\n<h2>Lo stato metallurgico cambia la durezza del titanio?<\/h2>\n<p>S\u00ec, per le leghe trattabili termicamente. La scheda tecnica del Grade 5 indica da 30 a 36 HRC allo stato ricotto e circa da 35 a 39 HRC dopo solubilizzazione e invecchiamento, quindi la stessa lega pu\u00f2 arrivare in due fasce di durezza diverse a seconda dello stato indicato nell\u2019ordine. Il valore RMI del Grade 5 \u00e8 un dato nominale senza un intervallo di stato. Per le qualit\u00e0 non legate lo stato di fornitura normale \u00e8 il ricotto e i valori della tabella sono quelli da attendersi.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/beiyutitanium.com\/wp-content\/uploads\/2026\/08\/titanium-precision-ground-bar-batch-1024x683.webp\" alt=\"Batch of precision ground titanium round bar laid out for inspection\" width=\"1024\" height=\"683\" \/><figcaption>Lotto di barre tonde di titanio rettificate di precisione disposte per il controllo<\/figcaption><\/figure>\n<h2>Inserire un limite di durezza in un ordine di titanio<\/h2>\n<p>Poich\u00e9 ASTM B265 e B348 non prevedono una colonna per la durezza, un certificato emesso solo secondo quelle norme non \u00e8 tenuto a riportare la durezza, e il materiale non pu\u00f2 essere respinto sulla durezza in base ad esse. Il lato documentale di questo aspetto \u00e8 illustrato in <a href=\"https:\/\/beiyutitanium.com\/it\/titanium-vs-stainless-steel\/\">titanio e acciaio inossidabile a confronto<\/a>. Quando il pezzo richiede effettivamente un limite di durezza, l\u2019ordine deve riportarlo come requisito aggiuntivo.<\/p>\n<table>\n<tr>\n<th>Voce dell'ordine<\/th>\n<th>Cosa indicare<\/th>\n<\/tr>\n<tr>\n<td>Grado e stato<\/td>\n<td>Per esempio Grade 5 ricotto, oppure Grade 5 solubilizzato e invecchiato<\/td>\n<\/tr>\n<tr>\n<td>Scala<\/td>\n<td>La scala usata dal disegno (HRB, HRC, HB o HV), indicata esplicitamente<\/td>\n<\/tr>\n<tr>\n<td>Limite<\/td>\n<td>Minimo, massimo o intervallo su quella scala<\/td>\n<\/tr>\n<tr>\n<td>Metodo di prova e rendicontazione<\/td>\n<td>Il metodo di prova, e che il risultato sia riportato sul certificato<\/td>\n<\/tr>\n<\/table>\n<p>Per la barra, la <a href=\"https:\/\/beiyutitanium.com\/it\/titanium-bar-rfq-checklist\/\">lista di controllo per la richiesta di offerta di barre di titanio<\/a> indica le altre voci necessarie alla richiesta, e il materiale \u00e8 fornito come <a href=\"https:\/\/beiyutitanium.com\/it\/product\/grade-2-titanium-bar\/\">Barra di titanio Grade 2<\/a> o <a href=\"https:\/\/beiyutitanium.com\/it\/product\/6al4v-titanium-plate\/\">Lamiera Ti-6Al-4V<\/a> tra le altre forme.<\/p>\n<h2>Domande comuni<\/h2>\n<p><strong>Qual \u00e8 la qualit\u00e0 di titanio pi\u00f9 dura?<\/strong> Nei valori RMI per le qualit\u00e0 sopra indicate, il Grade 5 a un nominale di 33 HRC, con il Grade 23 a 32 HRC; tra le qualit\u00e0 non legate, il Grade 4 a 100 HRB.<\/p>\n<p><strong>Il titanio \u00e8 pi\u00f9 duro dell\u2019acciaio?<\/strong> Dipende dall\u2019acciaio; il confronto, compreso il motivo per cui l\u2019usura \u00e8 una questione di superficie e non un valore di durezza di massa, si trova su <a href=\"https:\/\/beiyutitanium.com\/it\/titanium-vs-stainless-steel\/\">titanio e acciaio inossidabile a confronto<\/a>.<\/p>\n<p><strong>Qual \u00e8 la durezza del titanio Grade 2?<\/strong> Un valore nominale di 82 HRB nella guida RMI; la <a href=\"https:\/\/beiyutitanium.com\/it\/grade-2-titanium-cp-uns-r50400\/\">scheda tecnica Grade 2<\/a> indica valori tipici intorno a 150 HB, oppure da 160 a 200 HV.<\/p>\n<p><strong>Il titanio \u00e8 magnetico?<\/strong> La risposta, con i valori di permeabilit\u00e0 per qualit\u00e0, si trova su <a href=\"https:\/\/beiyutitanium.com\/it\/is-titanium-magnetic\/\">il titanio \u00e8 magnetico<\/a>.<\/p>\n<p><strong>Il titanio \u00e8 pesante?<\/strong> La densit\u00e0 per qualit\u00e0 e il peso per metro per dimensione di barra si trovano su <a href=\"https:\/\/beiyutitanium.com\/it\/is-titanium-heavy\/\">il titanio \u00e8 pesante<\/a>.<\/p>\n<p><strong>La durezza compare sul certificato di fabbrica del titanio?<\/strong> ASTM B265 e B348 non lo richiedono, quindi compare solo quando l\u2019ordine lo aggiunge, come nella sezione sull\u2019ordine qui sopra.<\/p>\n<h2>Dettagli delle specifiche con fonti<\/h2>\n<p>I valori nominali di durezza provengono da RMI Titanium Company <em>Guida alle leghe di titanio<\/em> (January 2000), which gives one nominal figure per grade on its data sheets: 70 HRB for Grade 1, 82 HRB for Grade 2, 90 HRB for Grade 3, 100 HRB for Grade 4, 82 HRB for Grade 7, 88 HRB for Grade 12, 25 HRC for Grade 9, 32 HRC for Grade 23 and 33 HRC for Grade 5. The oxygen, nitrogen and iron maximums in the unalloyed-grade table are from the same guide&#8217;s chemical composition lines for those grades. The Beiyu figures are the typical values carried on the Beiyu Titanium Grade 2 and Grade 5 data sheets, and they are shown next to RMI&#8217;s rather than reconciled because they are typical values from two publications, and for Grade 2 on different scales. None of these is a specification limit: ASTM B265 and ASTM B348 set chemical, mechanical and dimensional requirements and contain no hardness requirement, so hardness is verified only when the purchase order adds it.<\/p>\n<h2>Che cosa inserire nella richiesta<\/h2>\n<p>Indicare la qualit\u00e0, lo stato e, se il disegno lo prevede, il limite di durezza con la relativa scala; con questi dati la prova di durezza viene quotata insieme al materiale anzich\u00e9 sollevata al collaudo. Beiyu Titanium fornisce titanio in Grade 1, 2, 5, 7, 9, 12 e 23 come barra, lamiera, foglio, tubo e pezzi forgiati secondo le norme ASTM e AMS, con un certificato di collaudo di fabbrica 3.1 secondo EN 10204 secondo l\u2019ambito dell\u2019ordine.<\/p>","protected":false},"excerpt":{"rendered":"<p>Titanium hardness depends on the grade. The unalloyed grades sit on the Rockwell B scale, from 70 HRB for Grade 1 to 100 HRB for Grade 4, while the alloys Grade 9, Grade 5 and Grade 23 move to the Rockwell C scale, with Grade 5 at a nominal 33 HRC in the RMI Titanium [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6274","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Titanium Hardness by Grade | HRB, HRC, HB and HV | Beiyu<\/title>\n<meta name=\"description\" content=\"Titanium hardness by grade: 70 HRB for Grade 1 to 33 HRC for Grade 5, with sources, what each scale means, and why ASTM B265 and B348 set no hardness limit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/beiyutitanium.com\/it\/titanium-hardness-by-grade\/\" \/>\n<meta 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La produzione avviene presso lo stabilimento produttore di titanio Beiyu a Baoji, Shaanxi. 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In oltre 15 anni nell'esportazione di titanio ha imparato a riesaminare personalmente ogni riga della specifica, verificando grado, norma, dimensioni, tolleranza e ambito del certificato rispetto alla capacit\u00e0 dello stabilimento produttore prima di formulare un'offerta, anzich\u00e9 inoltrare le richieste attraverso un ufficio vendite. \u00c8 arrivato alla fornitura di titanio dall'altra parte della transazione. Prima di guidare l'attivit\u00e0 internazionale di Beiyu ha lavorato presso Koch (Koch-Glitsch) ed \u00e8 stato direttamente coinvolto nella consegna di un progetto petrolchimico SABIC a Fujian, Cina. Tale lavoro si basava su piani di controllo e prova, certificazione dei materiali e tracciabilit\u00e0 tramite il numero di colata, coordinamento del collaudo di terza parte e controllo della documentazione e dei dossier di progetto. Sono le stesse quattro cose a cui un acquirente dell'industria di processo o regolamentato sottoporr\u00e0 un fornitore di titanio, e aver dovuto farle rispettare come cliente spiega perch\u00e9 qui siano trattate come parte della fornitura anzich\u00e9 come documentazione prodotta in seguito. Il suo lavoro quotidiano copre le questioni a cui questo sito intende rispondere: scegliere tra gradi di titanio commercialmente puro e legato per un servizio corrosivo, leggere un certificato del materiale rispetto alla norma ordinata e associare la designazione di un acquirente (grado ASTM, UNS, numero Werkstoff tedesco o codice NF francese) allo stesso metallo nei vari mercati. 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