Qualité sans compromis

40NiCrMo7/SAE 4340/L43

ASTM A320

Trempé et revenu (+QT) 

PROPRIÉTÉS ET UTILISATIONS

C'EST UN ACIER ALLIÉ À HAUTE RÉSISTANCE ET À UNE BONNE TÉNACITÉ. IL EST UTILISÉ LORSQU'IL EST NÉCESSAIRE D'AVOIR DES CARACTÉRISTIQUES SUPÉRIEURES À CELLES OFFERTES PAR LE 39NiCrMo3, NOTAMMENT POUR LES PIÈCES DE FORTE ÉPAISSEUR.
SON APTITUDE AU TREMPAGE EST EXCEPTIONNELLE. LES PIÈCES DE PETITES DIMENSIONS (Ø < 15 MM) PEUVENT ÊTRE TREMPÉES À L'AIR. IL EST ADAPTÉ À LA TREMPE SUPERFICIELLE, OBTENANT UNE DURETÉ DE 54 À 59 HRC SELON LA TENEUR EN CARBONE.
IL PRÉSENTE UNE RÉSISTANCE À LA FATIGUE ÉLEVÉE JUSQU'À UNE TEMPÉRATURE DE PLUS OU MOINS 450 °C ET..
16NiCrMo12

Il peut être soumis à un traitement thermique de nitruration, ce qui permet d'obtenir une augmentation notable de la limite de fatigue et des duretés superficielles élevées. Grâce à sa grande trempabilité, il est généralement destiné à la construction de pièces de grandes dimensions soumises à des conditions d'utilisation difficiles, comme les arbres pour turbines hydroélectriques. Il est également utilisé avec succès pour la fabrication de boulons à haute résistance.

L'acier de nuance 40NiCrMo7, désigné sous le numéro 1.6562 selon la norme européenne EN, est un acier allié au nickel-chrome-molybdène reconnu pour sa résistance exceptionnelle, sa ténacité et sa trempabilité. Cet acier est particulièrement important lorsqu'il est conforme à la norme ASTM A320, plus précisément sous la nuance L43, qui régit les matériaux de boulonnerie en acier allié destinés à des applications à basse température.

La norme ASTM A320, élaborée par l'American Society for Testing and Materials, couvre les matériaux de boulonnerie en acier allié et en acier inoxydable conçus pour un service à basse température, comme dans les cuves sous pression, les vannes, les brides et les raccords. La nuance L43 de cette norme spécifie le 40NiCrMo7 (ou son équivalent, tel que l'AISI 4340) pour les fixations, garantissant qu'elles conservent leur intégrité structurelle et leur ténacité dans des conditions de températures négatives. La norme impose des exigences strictes en matière de composition chimique, de traitement thermique et de propriétés mécaniques, y compris la résilience à l'entaille, pour assurer des performances dans des applications critiques.

L'application principale du 40NiCrMo7 sous la norme ASTM A320 L43 concerne la fabrication de fixations telles que des boulons, des goujons et des écrous pour des environnements à basse température. Ces éléments sont essentiels dans des industries comme le pétrole et le gaz, la pétrochimie et la production d'énergie, où ils sécurisent des cuves sous pression, des vannes et des raccords fonctionnant dans des conditions de températures négatives.

Au-delà des fixations, la haute trempabilité et la ténacité du 40NiCrMo7 le rendent adapté à une gamme d'applications en ingénierie :

  • Essieux et arbres de grande taille : Utilisés dans les turbines hydroélectriques et les machines lourdes, exploitant sa capacité à supporter des contraintes et des impacts importants ;
  • Composants de machines : Employés dans les engrenages, les vilebrequins et les bielles, où des contraintes élevées, des torsions et des vibrations sont fréquentes ;
  • Composants d'ingénierie : Utilisés dans les secteurs minier, de la construction et de l'aérospatiale pour des pièces nécessitant une fiabilité dans des conditions extrêmes ;
  • Pièces durcies en surface : Appliqués dans les arbres à cames et les porte-outils, où la résistance à l'usure est améliorée par des procédés comme la nitruration.
 

CORRESPONDANCE DÉSIGNATION INTERNATIONALE

AcierEUROPEALLEMAGNEFRANCEESPAGNAG.B.USA
ENDINW.n.AFNORUNEB.S.AISI/SAE
40NiCrMo7 / L43 40NiCrMo7 40NiCrMo8-4 1.6562     817M40

4340

L43

 

COMPOSITION CHIMIQUE % (ASTM A 320)

AcierCHEMICAL COMPOSITION
désignationW.nr.CMnSiP
max
S
max
CrMoNi

40NiCrMo7 / L43

1.6562 0,38 ÷ 0,43 0,60 ÷ 0,85 0,15 ÷ 0,35 0,035 0,040 0,70 ÷ 0,90 0,20 ÷ 0,30 1,65 ÷ 2,00

CONCENTRATION LIMITS OF THE ELEMENTS THAT ARE NOT INDICATED IN THE TABLE CAN BE DEDUCED IN THE EN 10020 REGULATION.

 

CARACTÉRISTIQUES MÉCANIQUES

acier  
désignation W.nr. Re min Rm min A min Z min Impact test -101°C
N/mm2 % % J
40NiCrMo7 / L43 1.6562 725 860 16 50 27 min

 

NORMALEMENT DISPONIBLE EN STOCK

Coloration M.T.AciersTraitement thermiqueÉtat de surfaceDiamètre Ø (mm)

40NiCrMo7

L43

Trempé revenu (+QT)

Ronds laminés

Ronds transformés à froid

65-250

 

TÉLÉCHARGER

 

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  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `mtcca_categories` AS `s` INNER JOIN `mtcca_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`1.97ms4.02KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `mtcca_modules` AS `m` LEFT JOIN `mtcca_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `mtcca_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1,:preparedArray2)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) AND `m`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY `m`.`position`,`m`.`ordering`2.06ms18.22KBParams/libraries/src/Cache/Controller/CallbackController.php:120Copy
  • SELECT `a`.`menutype`,`a`.`title` FROM `mtcca_menu_types` AS `a` WHERE `a`.`client_id` = 0571μs3.14KB/libraries/gantry5/src/classes/Gantry/Framework/Menu.php:138Copy
  • SELECT m.id, m.alias, m.path AS route, m.level, m.parent_id FROM mtcca_menu AS m WHERE m.menutype = 'mainmenu-fra' AND m.parent_id > 0 AND m.client_id = 0 AND m.published >= 0 ORDER BY m.lft1.47ms1.98KB/libraries/gantry5/src/classes/Gantry/Framework/Menu.php:791Copy
  • SELECT `alias`,`catid` FROM mtcca_content WHERE `id` = :key439μs1.37KBParams/libraries/src/Component/Router/Rules/PreprocessRules.php:123Copy
  • SELECT `alias`,`catid` FROM mtcca_content WHERE `id` = :key427μs1.37KBParams/libraries/src/Component/Router/Rules/PreprocessRules.php:123Copy
  • SELECT * FROM `mtcca_extensions` WHERE `element` = 'com_gsd' AND `type` = 'component'886μs2.53KB/plugins/system/nrframework/NRFramework/Extension.php:160Copy
  • SHOW FULL COLUMNS FROM `mtcca_gsd_config`1.42ms1.3KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:539Copy
  • SELECT * FROM `mtcca_gsd_config` WHERE `name` = 'config'346μs592B/libraries/src/Table/Table.php:780Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`state`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`version`,`a`.`ordering`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`metadata`,`a`.`featured`,`a`.`language`,`fp`.`featured_up`,`fp`.`featured_down`,`c`.`title` AS `category_title`,`c`.`alias` AS `category_alias`,`c`.`access` AS `category_access`,`c`.`language` AS `category_language`,`fp`.`ordering`,`u`.`name` AS `author`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language`,ROUND(`v`.`rating_sum` / `v`.`rating_count`, 1) AS `rating`,`v`.`rating_count` AS `rating_count` FROM `mtcca_content` AS `a` INNER JOIN `mtcca_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `mtcca_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` LEFT JOIN `mtcca_users` AS `u` ON `u`.`id` = `a`.`created_by` LEFT JOIN `mtcca_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `mtcca_content_rating` AS `v` ON `a`.`id` = `v`.`content_id` WHERE ( (`a`.`id` = :pk AND `c`.`published` > 0) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown)1.42ms22.13KBParams/components/com_content/src/Model/ArticleModel.php:215Copy
  • SELECT a.* FROM mtcca_gsd a WHERE a.state = 1 AND a.plugin = 'content' AND a.appview IN ('article','*') AND a.language IN ('fr-FR','*') ORDER BY a.id desc512μs1.45KB/libraries/src/MVC/Model/BaseDatabaseModel.php:164Copy
  • SELECT * FROM `mtcca_schemaorg` WHERE `itemId` = :itemId AND `context` = :context562μs1.55KBParams/plugins/system/schemaorg/src/Extension/Schemaorg.php:406Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`state`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`version`,`a`.`ordering`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`metadata`,`a`.`featured`,`a`.`language`,`fp`.`featured_up`,`fp`.`featured_down`,`c`.`title` AS `category_title`,`c`.`alias` AS `category_alias`,`c`.`access` AS `category_access`,`c`.`language` AS `category_language`,`fp`.`ordering`,`u`.`name` AS `author`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language`,ROUND(`v`.`rating_sum` / `v`.`rating_count`, 1) AS `rating`,`v`.`rating_count` AS `rating_count` FROM `mtcca_content` AS `a` INNER JOIN `mtcca_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `mtcca_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` LEFT JOIN `mtcca_users` AS `u` ON `u`.`id` = `a`.`created_by` LEFT JOIN `mtcca_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `mtcca_content_rating` AS `v` ON `a`.`id` = `v`.`content_id` WHERE ( (`a`.`id` = :pk AND `c`.`published` > 0 AND `a`.`language` IN (:preparedArray1,:preparedArray2)) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown) AND `a`.`state` IN (:preparedArray3,:preparedArray4)1.14ms22.23KBParams/components/com_content/src/Model/ArticleModel.php:215Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`state`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`version`,`a`.`ordering`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`metadata`,`a`.`featured`,`a`.`language`,`fp`.`featured_up`,`fp`.`featured_down`,`c`.`title` AS `category_title`,`c`.`alias` AS `category_alias`,`c`.`access` AS `category_access`,`c`.`language` AS `category_language`,`fp`.`ordering`,`u`.`name` AS `author`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language`,ROUND(`v`.`rating_sum` / `v`.`rating_count`, 1) AS `rating`,`v`.`rating_count` AS `rating_count` FROM `mtcca_content` AS `a` INNER JOIN `mtcca_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `mtcca_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` LEFT JOIN `mtcca_users` AS `u` ON `u`.`id` = `a`.`created_by` LEFT JOIN `mtcca_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `mtcca_content_rating` AS `v` ON `a`.`id` = `v`.`content_id` WHERE ( (`a`.`id` = :pk AND `c`.`published` > 0 AND `a`.`language` IN (:preparedArray1,:preparedArray2)) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown) AND `a`.`state` IN (:preparedArray3,:preparedArray4)1.04ms22.23KBParams/components/com_content/src/Model/ArticleModel.php:215Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `mtcca_scheduler_tasks` AS `a` WHERE `a`.`state` = 1583μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:517Copy
  • SELECT `session_id` FROM `mtcca_session` WHERE `session_id` = ?904μs1008BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:277Copy
  • INSERT INTO `mtcca_session` (`data`,`time`,`session_id`) VALUES (?, ?, ?)1.16ms544BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:301Copy