{"id":6248,"date":"2026-09-10T13:10:26","date_gmt":"2026-09-10T13:10:26","guid":{"rendered":"https:\/\/beiyutitanium.com\/is-titanium-magnetic\/"},"modified":"2026-09-10T13:10:26","modified_gmt":"2026-09-10T13:10:26","slug":"is-titanium-magnetic","status":"publish","type":"post","link":"https:\/\/beiyutitanium.com\/fr\/is-titanium-magnetic\/","title":{"rendered":"Le titane est-il magn\u00e9tique ? Nuances, perm\u00e9abilit\u00e9 et ce que les normes ne v\u00e9rifient pas"},"content":{"rendered":"

Non. Le titane est paramagn\u00e9tique, et non ferromagn\u00e9tique, et un aimant domestique n'y adh\u00e8re pas. La perm\u00e9abilit\u00e9 magn\u00e9tique relative se situe juste au-dessus de 1.0 dans les nuances commerciales indiqu\u00e9es ci-dessous, raison pour laquelle la pratique d'ing\u00e9nierie consid\u00e8re le titane comme non magn\u00e9tique plut\u00f4t que faiblement magn\u00e9tique. Cette distinction importe d\u00e8s lors qu'un plan demande une valeur garantie, car les sp\u00e9cifications de mat\u00e9riau n'en v\u00e9rifient aucune.<\/p>\n

\"Batch<\/figure>\n

Ce que signifie paramagn\u00e9tique en valeur num\u00e9rique<\/h2>\n

Un m\u00e9tal ferromagn\u00e9tique pr\u00e9sente une perm\u00e9abilit\u00e9 relative de plusieurs centaines ou milliers. Le titane se situe \u00e0 l'autre extr\u00e9mit\u00e9. Les valeurs publi\u00e9es par Beiyu Titanium pour les nuances ci-dessous sont suffisamment proches de 1.0 pour que la r\u00e9ponse soit mesurable avec des instruments, mais pas avec un aimant tenu \u00e0 la main.<\/p>\n\n\n\n\n\n
Nuance<\/th>\nCe qu'indique la fiche technique Beiyu<\/th>\nType de valeur<\/th>\n<\/tr>\n
Grade 5 (Ti-6Al-4V, UNS R56400)<\/td>\nPerm\u00e9abilit\u00e9 relative 1.00005 \u00e0 1.6 kA\/m<\/td>\nUne valeur mesur\u00e9e \u00e0 une intensit\u00e9 de champ sp\u00e9cifi\u00e9e<\/td>\n<\/tr>\n
Grade 23 (Ti-6Al-4V ELI)<\/td>\nPerm\u00e9abilit\u00e9 relative de 1.01 ou moins<\/td>\nUne limite sup\u00e9rieure, et non une valeur mesur\u00e9e<\/td>\n<\/tr>\n
Grade 2 (titane CP, UNS R50400)<\/td>\nParamagn\u00e9tique, seulement l\u00e9g\u00e8rement sup\u00e9rieur \u00e0 1.0<\/td>\nUne description qualitative<\/td>\n<\/tr>\n<\/table>\n

Lisez la troisi\u00e8me colonne avant de comparer les lignes. L'entr\u00e9e Grade 23 est une valeur plafond plut\u00f4t qu'une mesure, elle ne signifie donc pas que Grade 23 r\u00e9agit plus fortement que Grade 5 ; elle signifie qu'aucune valeur mesur\u00e9e n'a \u00e9t\u00e9 publi\u00e9e ici pour cette nuance.<\/p>\n

Il existe \u00e9galement une raison li\u00e9e \u00e0 la composition qui s'applique quelle que soit la valeur mesur\u00e9e. Aucun de ces alliages ne contient de phase ferromagn\u00e9tique. Grade 5 est du titane avec de l'aluminium et du vanadium, Grade 2 est non alli\u00e9. Le fer est pr\u00e9sent, mais uniquement comme \u00e9l\u00e9ment r\u00e9siduel limit\u00e9 par le tableau de composition chimique de la nuance, et il demeure dissous dans le r\u00e9seau cristallin du titane plut\u00f4t que de former une phase distincte susceptible de s'aligner dans un champ.<\/p>\n

Ce qu'une r\u00e9ponse sur les mat\u00e9riaux omet<\/h2>\n

C'est ici qu'une r\u00e9ponse sur les mat\u00e9riaux et une r\u00e9ponse d'achat divergent. ASTM B265 et ASTM B348, les sp\u00e9cifications selon lesquelles les t\u00f4les, plaques et barres en titane sont couramment command\u00e9es, d\u00e9finissent la composition chimique, les propri\u00e9t\u00e9s m\u00e9caniques et les tol\u00e9rances dimensionnelles. Aucune ne mentionne la perm\u00e9abilit\u00e9 magn\u00e9tique dans son texte. Un certificat \u00e9mis selon ces sp\u00e9cifications n'est pas tenu d'indiquer une valeur de perm\u00e9abilit\u00e9, car la sp\u00e9cification n'en demande aucune.<\/p>\n

Il n'existe pas non plus de clause pr\u00eate \u00e0 invoquer. B265 comporte des exigences suppl\u00e9mentaires qui s'appliquent lorsque la commande les demande, mais elles couvrent des sujets enti\u00e8rement diff\u00e9rents, \u00e0 commencer par l'essai de pliage de surface ; B348 ne comporte aucune section d'exigences suppl\u00e9mentaires. Une limite de perm\u00e9abilit\u00e9 constitue donc un essai suppl\u00e9mentaire convenu dans la commande plut\u00f4t qu'une option normalis\u00e9e assortie d'une valeur.<\/p>\n

La cons\u00e9quence pratique : une demande qui indique \u00ab doit \u00eatre non magn\u00e9tique \u00bb sans pr\u00e9ciser une limite, une m\u00e9thode de mesure et une intensit\u00e9 de champ demande quelque chose qu'aucun certificat mati\u00e8re ne peut confirmer, et elle sera renvoy\u00e9e pour clarification. Une demande qui pr\u00e9cise les trois peut faire l'objet d'une offre.<\/p>\n\n\n\n\n\n
Ce qu'indique le plan<\/th>\nCe que montre un certificat B265 ou B348<\/th>\nCe qu'il convient d'ajouter \u00e0 la commande<\/th>\n<\/tr>\n
Mat\u00e9riau non magn\u00e9tique<\/td>\nAucune indication sur la perm\u00e9abilit\u00e9<\/td>\nLa limite de perm\u00e9abilit\u00e9, la m\u00e9thode, l'intensit\u00e9 de champ<\/td>\n<\/tr>\n
Perm\u00e9abilit\u00e9 relative inf\u00e9rieure \u00e0 une valeur sp\u00e9cifi\u00e9e<\/td>\nAucune indication sur la perm\u00e9abilit\u00e9<\/td>\nUn essai suppl\u00e9mentaire convenu et la personne qui y assiste<\/td>\n<\/tr>\n
Aucune exigence magn\u00e9tique<\/td>\nComposition chimique et propri\u00e9t\u00e9s m\u00e9caniques uniquement<\/td>\nAucune; la nuance r\u00e9pond d\u00e9j\u00e0 \u00e0 la question<\/td>\n<\/tr>\n<\/table>\n
\"Machined<\/figure>\n

L\u00e0 o\u00f9 la r\u00e9ponse modifie r\u00e9ellement une d\u00e9cision<\/h2>\n

Pour la plupart des pi\u00e8ces, non. Le titane est choisi pour sa r\u00e9sistance \u00e0 la corrosion, son rapport r\u00e9sistance\/poids ou sa biocompatibilit\u00e9, et son comportement magn\u00e9tique est une propri\u00e9t\u00e9 \u00e0 laquelle personne n'a besoin de penser. Trois situations font exception, et dans les trois cas, le titane est choisi parce que l'alternative perturberait quelque chose.<\/p>\n\n\n\n\n\n
Situation<\/th>\nPourquoi le titane est choisi<\/th>\nComment l'exigence est habituellement formul\u00e9e<\/th>\n<\/tr>\n
Environnements d'imagerie et d'instrumentation<\/td>\nLes bo\u00eetiers, \u00e9l\u00e9ments de fixation et raccords se trouvent dans ou \u00e0 proximit\u00e9 d'un champ et ne doivent ni se d\u00e9placer ni le d\u00e9former<\/td>\nComme d\u00e9signation de mat\u00e9riau, parfois avec une limite sup\u00e9rieure de perm\u00e9abilit\u00e9<\/td>\n<\/tr>\n
D\u00e9tection et mesure<\/td>\nUn bo\u00eetier sensible magn\u00e9tiquement modifie ce que lit le capteur qu'il contient<\/td>\nComme d\u00e9signation de mat\u00e9riau sur le plan du bo\u00eetier<\/td>\n<\/tr>\n
Ensembles o\u00f9 un champ parasite est interpr\u00e9t\u00e9 comme un d\u00e9faut<\/td>\nLa pi\u00e8ce doit \u00eatre invisible pour le syst\u00e8me de d\u00e9tection qui l'entoure<\/td>\nComme limite sup\u00e9rieure de perm\u00e9abilit\u00e9<\/td>\n<\/tr>\n<\/table>\n

Toute ligne indiquant une limite sup\u00e9rieure n\u00e9cessite l'essai convenu d\u00e9crit ci-dessus, car cette limite est l'\u00e9l\u00e9ment que la sp\u00e9cification du mat\u00e9riau ne couvre pas.<\/p>\n

Questions compl\u00e9mentaires courantes<\/h2>\n

Le titane est-il magn\u00e9tique, et un aimant y adh\u00e8re-t-il ?<\/strong> Non. La r\u00e9ponse est trop faible pour vaincre le poids de l'aimant.<\/p>\n

Le titane Grade 5 est-il magn\u00e9tique, et est-il plus magn\u00e9tique que Grade 2 ?<\/strong> Les deux sont paramagn\u00e9tiques et les deux sont consid\u00e9r\u00e9s comme non magn\u00e9tiques. La valeur publi\u00e9e de 1.00005 pour Grade 5 et la description de Grade 2 comme l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 1.0 se situent dans la m\u00eame plage pratique.<\/p>\n

Ma pi\u00e8ce en titane a attir\u00e9 un aimant. Que s'est-il pass\u00e9 ?<\/strong> La cause b\u00e9nigne la plus fr\u00e9quente est du fer en surface provenant d'outillage en acier, du brossage m\u00e9tallique ou du grenaillage, qui est \u00e9limin\u00e9 par d\u00e9capage plut\u00f4t que par le rejet de la pi\u00e8ce. Une r\u00e9ponse qui persiste apr\u00e8s nettoyage indique que l'article n'est pas le mat\u00e9riau indiqu\u00e9 sur son \u00e9tiquette, ou que quelque chose de ferromagn\u00e9tique y est fix\u00e9 ou incorpor\u00e9. Dans tous les cas, il convient de r\u00e9soudre ce point avant la mise en service de la pi\u00e8ce.<\/p>\n

Le titane rouille-t-il ?<\/strong> Non. La rouille est un oxyde de fer, et le titane ne poss\u00e8de aucune phase de fer susceptible de la former. Le titane porte \u00e0 la place un film passif de dioxyde de titane, qui rel\u00e8ve d'un m\u00e9canisme diff\u00e9rent et explique ses performances dans l'eau de mer et les acides oxydants.<\/p>\n

L'ensemble plus large des chiffres publi\u00e9s sur le titane, et lesquels sont effectivement rapport\u00e9s par un certificat, est pr\u00e9sent\u00e9 dans faits sur le titane<\/a>.<\/p>\n

Le titane peut-il devenir magn\u00e9tique par traitement thermique ou \u00e9crouissage ?<\/strong> Non. Les alliages fournis ici ne contiennent aucune phase ferromagn\u00e9tique susceptible de se d\u00e9velopper lors de la transformation, de sorte que le comportement magn\u00e9tique du titane ne change pas avec l'\u00e9tat comme le font la duret\u00e9 ou la r\u00e9sistance.<\/p>\n

Le titane est-il suffisamment magn\u00e9tique pour avoir une incidence dans une IRM ou un bo\u00eetier de capteur ?<\/strong> Il est sp\u00e9cifi\u00e9 pour ces environnements pr\u00e9cis\u00e9ment parce qu'il ne l'est pas. Une limite garantie doit n\u00e9anmoins \u00eatre inscrite dans la commande, car la sp\u00e9cification du mat\u00e9riau n'en v\u00e9rifie aucune.<\/p>\n

D\u00e9tails des sp\u00e9cifications avec sources<\/h2>\n

La valeur de perm\u00e9abilit\u00e9 relative de 1.00005 \u00e0 1.6 kA\/m cit\u00e9e ci-dessus est celle indiqu\u00e9e dans la fiche technique Beiyu Titanium Grade 5<\/a>; la limite sup\u00e9rieure de 1.01 ou moins est indiqu\u00e9e dans la fiche technique Grade 23<\/a>, et la description paramagn\u00e9tique dans la fiche technique Grade 2<\/a>. L'affirmation selon laquelle la perm\u00e9abilit\u00e9 n'est pas v\u00e9rifi\u00e9e refl\u00e8te le texte m\u00eame d'ASTM B265 et ASTM B348 : aucune de ces sp\u00e9cifications ne contient les mots magn\u00e9tique ou perm\u00e9abilit\u00e9, les exigences suppl\u00e9mentaires de B265 commencent par l'essai de pliage de surface plut\u00f4t que par une propri\u00e9t\u00e9 magn\u00e9tique, et B348 ne comporte aucune section relative aux exigences suppl\u00e9mentaires. Une limite de perm\u00e9abilit\u00e9 est donc convenue entre l'acheteur et le fournisseur et indiqu\u00e9e dans la commande.<\/p>\n

Commander du titane lorsque l'exigence magn\u00e9tique est r\u00e9elle<\/h2>\n

Beiyu Titanium fournit des barres, plaques, t\u00f4les, tubes et pi\u00e8ces forg\u00e9es en titane de Grade 1, 2, 5, 7, 9, 12 et 23 selon les sp\u00e9cifications ASTM et AMS, avec un certificat de r\u00e9ception 3.1 selon EN 10204 selon le p\u00e9rim\u00e8tre de la commande. Lorsqu'une limite de perm\u00e9abilit\u00e9 s'applique, envoyez la limite, la m\u00e9thode de mesure et l'intensit\u00e9 du champ avec la nuance, les dimensions et la tol\u00e9rance, afin que l'essai puisse \u00eatre organis\u00e9 et chiffr\u00e9 dans l'offre plut\u00f4t que d\u00e9couvert lors du contr\u00f4le.<\/p>","protected":false},"excerpt":{"rendered":"

No. Titanium is paramagnetic, not ferromagnetic, and a household magnet will not stick to it. Relative magnetic permeability sits just above 1.0 in the commercial grades listed below, which is why engineering practice treats titanium as non-magnetic rather than weakly magnetic. The distinction matters once a drawing asks for a guaranteed figure, because the material […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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-6248","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nIs Titanium Magnetic? 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Over 15 years in titanium export he has learned to review each specification line himself, checking grade, standard, dimensions, tolerance and certificate scope against mill capability before quoting, rather than routing enquiries through a sales desk. He came to titanium supply from the other side of the transaction. Before leading Beiyu's international business he worked at Koch (Koch-Glitsch) and was directly involved in delivering a SABIC petrochemical project in Fujian, China. That work was built on inspection and test plans, material certification and heat traceability, third party inspection coordination, and project documentation and dossier control. Those are the same four things a process industry or regulated buyer will hold a titanium supplier to, and having had to enforce them as a customer is why they are treated here as part of the supply rather than as paperwork produced afterwards. 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Ce travail reposait sur des plans de contr\u00f4le et d'essais, la certification des mat\u00e9riaux et la tra\u00e7abilit\u00e9 par num\u00e9ro de coul\u00e9e, la coordination du contr\u00f4le par tierce partie, ainsi que le contr\u00f4le de la documentation et des dossiers de projet. Ce sont les quatre m\u00eames \u00e9l\u00e9ments qu'un acheteur de l'industrie des proc\u00e9d\u00e9s ou un acheteur soumis \u00e0 r\u00e9glementation exigera d'un fournisseur de titane, et le fait d'avoir d\u00fb les faire appliquer en tant que client explique qu'ils soient trait\u00e9s ici comme faisant partie de la fourniture plut\u00f4t que comme des documents produits ult\u00e9rieurement. Son travail quotidien couvre les questions auxquelles ce site est destin\u00e9 \u00e0 r\u00e9pondre : choisir entre des nuances de titane commercialement pur et alli\u00e9 pour un service corrosif, lire un certificat mati\u00e8re par rapport \u00e0 la norme command\u00e9e, et faire correspondre la d\u00e9signation d'un acheteur (nuance ASTM, UNS, num\u00e9ro Werkstoff allemand ou code NF fran\u00e7ais) au m\u00eame m\u00e9tal sur diff\u00e9rents march\u00e9s. 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