{"id":5426,"date":"2026-08-14T08:53:01","date_gmt":"2026-08-14T08:53:01","guid":{"rendered":"https:\/\/beiyutitanium.com\/titanium-bar-ultrasonic-acceptance-class\/"},"modified":"2026-08-15T01:47:34","modified_gmt":"2026-08-15T01:47:34","slug":"titanium-bar-ultrasonic-acceptance-class","status":"publish","type":"post","link":"https:\/\/beiyutitanium.com\/fr\/titanium-bar-ultrasonic-acceptance-class\/","title":{"rendered":"Classe d'acceptation ultrasonore des barres en titane : comment la sp\u00e9cifier"},"content":{"rendered":"
\"Precision<\/figure>\n

Ce qu'une classe d'acceptation ultrasonore d\u00e9finit r\u00e9ellement<\/h2>\n

Une ligne de commande indiquant “contr\u00f4l\u00e9 par ultrasons” ne d\u00e9crit pas une d\u00e9cision d'acceptation. Quatre champs d\u00e9terminent si une barre est accept\u00e9e : la m\u00e9thode, la couverture, le r\u00e9flecteur d'\u00e9talonnage et la classe d'acceptation. Deux usines peuvent toutes deux indiquer “UT accept\u00e9” avec des r\u00e9flecteurs diff\u00e9rents et parvenir \u00e0 des conclusions oppos\u00e9es sur la m\u00eame barre.<\/p>\n\n\n\n\n\n\n\n\n
Champ<\/th>\nCe qu'il d\u00e9termine<\/th>\n<\/tr>\n<\/thead>\n
M\u00e9thode<\/td>\nQuelles discontinuit\u00e9s le balayage peut effectivement atteindre<\/td>\n<\/tr>\n
Couverture<\/td>\nQuelle part de la section transversale et de la circonf\u00e9rence est balay\u00e9e<\/td>\n<\/tr>\n
R\u00e9flecteur d'\u00e9talonnage<\/td>\nL'\u00e9cho de r\u00e9f\u00e9rence qui r\u00e8gle la sensibilit\u00e9 de l'instrument<\/td>\n<\/tr>\n
Classe d'acceptation<\/td>\nLe niveau d'indication au-dessus duquel le mat\u00e9riau est rejet\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Le r\u00e9flecteur, et non le terme “ultrasonique”, d\u00e9termine la sensibilit\u00e9<\/h2>\n

Un trou \u00e0 fond plat (FBH) est une cible d'\u00e9talonnage. La sensibilit\u00e9 est r\u00e9gl\u00e9e de sorte que l'\u00e9cho de ce trou atteigne une hauteur d'\u00e9cran sp\u00e9cifi\u00e9e, puis les indications sont \u00e9valu\u00e9es par rapport \u00e0 celui-ci. Une inspection \u00e9talonn\u00e9e avec un r\u00e9flecteur plus grand accepte un mat\u00e9riau qu'un r\u00e9glage plus fin rejette, toutes les autres conditions \u00e9tant \u00e9gales.<\/p>\n

Le FBH est une r\u00e9f\u00e9rence, et non une d\u00e9claration selon laquelle toute discontinuit\u00e9 de cette taille est d\u00e9tect\u00e9e.<\/p>\n

R\u00e9glage document\u00e9 de Beiyu pour la voie des barres rectifi\u00e9es de pr\u00e9cision<\/h2>\n

Ce sont les valeurs appliqu\u00e9es par Beiyu pour la voie des barres rectifi\u00e9es sans centre de pr\u00e9cision. Elles doivent figurer sur la commande plut\u00f4t que d'\u00eatre d\u00e9duites des termes “contr\u00f4l\u00e9 par ultrasons”.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Param\u00e8tre ultrasonore<\/th>\nParam\u00e8tre document\u00e9<\/th>\n<\/tr>\n<\/thead>\n
M\u00e9thode<\/td>\nImmersion dans l'eau, onde longitudinale focalis\u00e9e<\/td>\n<\/tr>\n
Couverture<\/td>\n100 pour cent de la circonf\u00e9rence<\/td>\n<\/tr>\n
R\u00e9flecteur d'\u00e9talonnage<\/td>\nTrou \u00e0 fond plat radial de 1,2 mm de diam\u00e8tre, r\u00e9gl\u00e9 \u00e0 80 pour cent de la hauteur totale de l'\u00e9cran<\/td>\n<\/tr>\n
Fr\u00e9quence de la sonde<\/td>\n10 MHz<\/td>\n<\/tr>\n
Classe d'acceptation et sp\u00e9cification<\/td>\nEnregistr\u00e9es ensemble dans le rapport ultrasonore fourni avec la commande, conform\u00e9ment \u00e0 la sp\u00e9cification d\u00e9sign\u00e9e par la commande<\/td>\n<\/tr>\n
Sp\u00e9cifications appliqu\u00e9es<\/td>\nAMS-STD-2154 ou GB\/T 5193, selon ce que pr\u00e9voit la commande<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Lorsque la sp\u00e9cification d'acceptation modifie la r\u00e9ponse<\/h2>\n

AMS-STD-2154 et GB\/T 5193 sont toutes deux des sp\u00e9cifications d'acceptation pour le contr\u00f4le ultrasonore de produits corroy\u00e9s. Une commande qui d\u00e9signe l'une d'elles fixe les d\u00e9finitions de classe appliqu\u00e9es par l'usine. Une commande qui ne d\u00e9signe aucune des deux laisse la lettre de classe sans d\u00e9finition.<\/p>\n\n\n\n\n\n\n\n
La commande indique<\/th>\nCe que l'usine peut faire<\/th>\n<\/tr>\n<\/thead>\n
Classe seule, sans sp\u00e9cification<\/td>\nLa lettre de classe n'a pas de d\u00e9finition convenue ; l'acceptation est n\u00e9gociable apr\u00e8s coup<\/td>\n<\/tr>\n
Sp\u00e9cification seule, sans classe<\/td>\nL'usine applique sa classe par d\u00e9faut, qui peut ne pas correspondre \u00e0 l'intention du plan<\/td>\n<\/tr>\n
Sp\u00e9cification et classe<\/td>\nL'acceptation est objectivement v\u00e9rifiable lors du contr\u00f4le \u00e0 r\u00e9ception<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Quelle sp\u00e9cification d\u00e9finit la lettre de classe<\/h2>\n

Une lettre de classe n'a de sens qu'au sein de la sp\u00e9cification qui la d\u00e9finit. Diff\u00e9rentes sp\u00e9cifications ultrasonores utilisent diff\u00e9rents syst\u00e8mes de classes, de sorte qu'une commande qui d\u00e9signe une classe sans nommer sa sp\u00e9cification laisse le niveau d'acceptation ind\u00e9fini.<\/p>\n\n\n\n\n\n\n\n
Sp\u00e9cification<\/th>\nDomaine pour lequel elle est r\u00e9dig\u00e9e<\/th>\n<\/tr>\n<\/thead>\n
AMS 2631<\/td>\nContr\u00f4le ultrasonore des barres, billettes et plaques en titane et alliages de titane<\/td>\n<\/tr>\n
AMS-STD-2154<\/td>\nContr\u00f4le ultrasonore des m\u00e9taux corroy\u00e9s, utilis\u00e9 pour toutes les familles d'alliages<\/td>\n<\/tr>\n
GB\/T 5193<\/td>\nContr\u00f4le ultrasonore des plaques, barres et pi\u00e8ces forg\u00e9es en titane et alliages de titane<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Indiquez dans la commande la sp\u00e9cification dont rel\u00e8ve la classe. Lorsqu'un plan d\u00e9signe uniquement une lettre de classe, confirmez de quelle sp\u00e9cification elle est issue avant que le mat\u00e9riau ne soit lib\u00e9r\u00e9 pour contr\u00f4le.<\/p>\n

Pourquoi la gamme de barres finies et la gamme de billettes n'ont pas le m\u00eame domaine d'application<\/h2>\n

Les r\u00e9glages ci-dessus d\u00e9crivent la gamme de barres finies rectifi\u00e9es de pr\u00e9cision. La billette est contr\u00f4l\u00e9e selon le domaine convenu dans la commande<\/a> plut\u00f4t que selon cet ensemble. Indiquez selon quelle gamme le mat\u00e9riau est achet\u00e9, car la g\u00e9om\u00e9trie de balayage et la section transversale accessible diff\u00e8rent.<\/p>\n

Ce que le certificat devrait comporter<\/h2>\n

Un rapport ultrasonore ne peut \u00eatre v\u00e9rifi\u00e9 que s'il consigne les quatre m\u00eames champs sp\u00e9cifi\u00e9s dans la commande, ainsi que la tra\u00e7abilit\u00e9 reliant le rapport au mat\u00e9riau livr\u00e9<\/a>.<\/p>\n\n\n\n\n\n\n\n\n\n
Ligne du certificat<\/th>\nPourquoi un acheteur le v\u00e9rifie<\/th>\n<\/tr>\n<\/thead>\n
M\u00e9thode et fr\u00e9quence de la sonde<\/td>\nConfirme que le balayage correspond \u00e0 ce qui a \u00e9t\u00e9 command\u00e9<\/td>\n<\/tr>\n
D\u00e9claration de couverture<\/td>\nDistingue la couverture compl\u00e8te de l'\u00e9chantillonnage<\/td>\n<\/tr>\n
R\u00e9flecteur d'\u00e9talonnage et hauteur d'\u00e9cran<\/td>\nRend la sensibilit\u00e9 reproductible<\/td>\n<\/tr>\n
Classe d'acceptation et sp\u00e9cification<\/td>\nRend l'acceptation ou le rejet objectif<\/td>\n<\/tr>\n
Tra\u00e7abilit\u00e9 par num\u00e9ro de coul\u00e9e<\/td>\nRelie le rapport au mat\u00e9riau effectivement exp\u00e9di\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Comment cela s'articule avec les autres contr\u00f4les \u00e0 100 pour cent<\/h2>\n

Le contr\u00f4le par ultrasons des d\u00e9fauts est l'un des cinq contr\u00f4les que Beiyu effectue \u00e0 100 pour cent sur le parcours de barres rectifi\u00e9es de pr\u00e9cision, ce qui signifie chaque barre plut\u00f4t qu'un \u00e9chantillon du lot. Les essais de composition chimique et de traction sont des essais destructifs effectu\u00e9s sur des \u00e9prouvettes, consign\u00e9s par coul\u00e9e et par lot<\/a> sur le certificat mati\u00e8re.<\/p>\n\n\n\n\n\n\n\n\n\n
Contr\u00f4le \u00e0 100 pour cent sur ce parcours<\/th>\n<\/tr>\n<\/thead>\n
D\u00e9tection de d\u00e9fauts par ultrasons<\/td>\n<\/tr>\n
D\u00e9tection de d\u00e9fauts par courants de Foucault<\/td>\n<\/tr>\n
Contr\u00f4le optique de surface<\/td>\n<\/tr>\n
Mesure du diam\u00e8tre par laser infrarouge<\/td>\n<\/tr>\n
D\u00e9tection de la rectitude<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Clauses d'acceptation que vous pouvez ins\u00e9rer dans votre commande<\/h2>\n
M\u00e9thode ultrasonore : ______ (indiquer immersion ou contact, et le mode d'onde) Couverture : ______ (indiquer le pourcentage et les surfaces concern\u00e9es) R\u00e9flecteur d'\u00e9talonnage : ______ (indiquer le diam\u00e8tre du trou et la hauteur d'\u00e9cran) Fr\u00e9quence de la sonde : ______ Sp\u00e9cification d'acceptation : ______ (indiquer d'abord la sp\u00e9cification) Classe d'acceptation : ______ (utiliser une lettre de classe d\u00e9finie dans cette sp\u00e9cification) Exigence de rapport : rapport ultrasonore fourni avec la commande, tra\u00e7able au num\u00e9ro de coul\u00e9e figurant sur le certificat mati\u00e8re<\/pre>\n
Remplissez ces lignes dans la demande. Beiyu les v\u00e9rifie par rapport \u00e0 la sp\u00e9cification d'acceptation que vous avez indiqu\u00e9e avant qu'un prix ne soit affect\u00e9 \u00e0 la ligne.<\/p>\n
Utiliser le S\u00e9lecteur de classe d'acceptation UT<\/a> pour v\u00e9rifier les champs et g\u00e9n\u00e9rer une ligne de commande compl\u00e8te avant d'envoyer la demande de prix.<\/p>\n
\n
D\u00e9tails des sp\u00e9cifications avec sources<\/h2>\n
Une classe d'acceptation ultrasonore n'est pas d\u00e9finie par la norme de produit elle-m\u00eame. En revanche, elle ASTM B348<\/a> fixe le contenu de la commande: sa clause relative aux informations de commande exige le num\u00e9ro de nuance, la classification du produit, la composition chimique, les propri\u00e9t\u00e9s m\u00e9caniques, le marquage, la finition, l'emballage, les rapports requis et le sort des mat\u00e9riaux rejet\u00e9s (ASTM B348, ordering information). Une classe d'acceptation ultrasonore ne fait pas partie de ces valeurs par d\u00e9faut. Ce que la norme garantit est le contenu du certificat: le rapport doit inclure les r\u00e9sultats de toutes les analyses chimiques, des essais de traction et de tous les autres essais exig\u00e9s par la sp\u00e9cification, ainsi que le proc\u00e9d\u00e9 de fabrication, qu'il soit lamin\u00e9 \u00e0 chaud, forg\u00e9, extrud\u00e9 ou travaill\u00e9 \u00e0 froid (ASTM B348, certification). Une classe de contr\u00f4le doit \u00eatre ajout\u00e9e \u00e0 ces \u00e9l\u00e9ments dans la commande.<\/p>\n\n\n\n\n\n\n\n\n
Champ de commande requis par ASTM B348<\/th>\nO\u00f9 s'applique l'exigence ultrasonore<\/th>\n<\/tr>\n<\/thead>\n
Num\u00e9ro de nuance<\/td>\nFixe la composition chimique et les minimums m\u00e9caniques, non le contr\u00f4le<\/td>\n<\/tr>\n
Certification<\/td>\nASTM B348 exige que le rapport couvre l'analyse chimique, les essais de traction, tous les autres essais exig\u00e9s par la sp\u00e9cification et le proc\u00e9d\u00e9 de fabrication<\/td>\n<\/tr>\n
Acceptation ultrasonore<\/td>\nPas une valeur par d\u00e9faut; inscrite sur la commande comme exigence suppl\u00e9mentaire avec sa sp\u00e9cification et sa classe<\/td>\n<\/tr>\n
Sort des mat\u00e9riaux rejet\u00e9s<\/td>\nD\u00e9cide du sort des pi\u00e8ces rejet\u00e9es par le contr\u00f4le<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
La composition chimique indiqu\u00e9e sur le m\u00eame certificat est fix\u00e9e par cette norme : ASTM B348 fixe Grade 2 \u00e0 un maximum de 0,25 pour cent d'oxyg\u00e8ne et de 0,30 pour cent de fer, et Grade 5 \u00e0 un maximum de 0,20 pour cent d'oxyg\u00e8ne et de 0,40 pour cent de fer (ASTM B348, exigences chimiques). Les m\u00e9thodes d'essai r\u00e9f\u00e9renc\u00e9es incluent ASTM E1409 pour l'oxyg\u00e8ne et l'azote par fusion sous gaz inerte ainsi qu'ASTM E1447 pour l'hydrog\u00e8ne (ASTM B348, documents r\u00e9f\u00e9renc\u00e9s). La d\u00e9signation d'une m\u00e9thode \u00e9tablit comment une valeur a \u00e9t\u00e9 produite. Elle ne fixe pas la limite d'acceptation et ne dit rien de la classe ultrasonique, qui provient de la sp\u00e9cification d'acceptation que vous indiquez. Dans la pratique d'approvisionnement de Beiyu, les r\u00e9glages ultrasoniques cit\u00e9s ci-dessus s'appliquent uniquement \u00e0 la voie des barres rectifi\u00e9es sans centre de pr\u00e9cision.<\/p>\n
Envoyer une demande de prix technique<\/h2>\n
Pour les demandes de prix de barres en titane, indiquez la nuance, la norme ASTM ou AMS, le diam\u00e8tre, l\u2019\u00e9tat, la finition de surface, la tol\u00e9rance, la quantit\u00e9, la sp\u00e9cification et la classe d\u2019acceptation ultrasonore, ainsi que le certificat mati\u00e8re requis.<\/p>\n
Envoyer les d\u00e9tails de la demande de prix<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"
What an ultrasonic acceptance class actually fixes An order line that says “ultrasonic tested” does not describe an acceptance decision. Four fields decide whether a bar passes: the method, the coverage, the calibration reflector and the acceptance class. Two mills can both report “UT passed” against different reflectors and reach opposite conclusions on the same […]<\/p>\n","protected":false},"author":2,"featured_media":5261,"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":[27,137],"tags":[],"class_list":["post-5426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-technical-guides"],"yoast_head":"\nTitanium Bar Ultrasonic Acceptance Class: How to Specify It<\/title>\n<meta name=\"description\" content=\"An order that says ultrasonic tested does not fix an acceptance decision. 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