UDIMET® Alloy 720 Product Introduction
UDIMET® alloy 720 is a high-strength nickel-based superalloy known for its excellent mechanical properties and resistance to high-temperature environments. This article provides a comprehensive introduction to UDIMET® alloy 720, covering its chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and a comparison with similar alloys.
Composition chimique
UDIMET® alloy 720 is primarily composed of nickel with significant additions of cobalt, chromium, iron, and other elements to enhance its mechanical and thermal properties:
| Élément | Composition (%) |
|---|---|
| Nickel (Ni) | 59.0 – 63.0 |
| Cobalt (Co) | 17.0 – 21.0 |
| Chrome (Cr) | 15.0 – 17.0 |
| Fer (Fe) | 3,0 – 5,0 |
| Molybdène (Mo) | 1,5 – 2,5 |
| Tungstène (W) | 0.5 – 1.5 |
| Aluminium (Al) | 0.5 – 1.5 |
| Titane (Ti) | 0.5 – 1.5 |
| Bore (B) | 0.003 – 0.01 |
| Carbone (C) | 00,08 maximum |
Propriétés mécaniques
UDIMET® alloy 720 exhibits excellent mechanical properties suitable for high-temperature applications:
| Propriété | Valeur |
|---|---|
| Résistance à la traction, ksi (MPa) | 170 – 190 (1172 – 1310) |
| Limite d'élasticité (compensation de 0,2 %), ksi (MPa) | 120 – 140 (827 – 965) |
| Allongement (% en 2 pouces) | 15 – 20 |
| Dureté, Rockwell C (HRC) | 35 – 40 |
Caractéristiques de performance
UDIMET® alloy 720 offers several performance advantages:
- Résistance à haute température : Retains excellent mechanical properties at elevated temperatures up to 1000°C (1832°F).
- Oxidation Resistance: Provides good resistance to oxidation and high-temperature corrosion in various environments.
- Creep Resistance: Exhibits high creep resistance, making it suitable for applications under constant stress at high temperatures.
Applications industrielles
UDIMET® alloy 720 is used in various industries requiring high performance under extreme conditions:
| Secteur industriel | Applications |
|---|---|
| Aérospatial | Gas turbine components such as turbine blades, vanes, and discs. |
| Production d'électricité | Gas and steam turbine components, combustion chambers, and heat exchangers. |
| Traitement chimique | Reactor vessels, heat exchangers, and pipes handling corrosive chemicals at high temperatures. |
Formes et tailles
UDIMET® alloy 720 is available in various forms and sizes to meet specific application requirements:
- Formes: Feuilles, plaques, barres, pièces forgées et fils.
- Tailles : Épaisseur allant de 0,5 mm à 100 mm pour les plaques, et diamètre allant de 1 mm à 300 mm pour les barres rondes.
Normes de production
UDIMET® alloy 720 conforms to international production standards ensuring quality and reliability:
| Formulaire de produit | Formes disponibles | Tailles disponibles | Normes de production |
|---|---|---|---|
| Plaques/Feuilles | Feuilles, plaques | Épaisseur : 0,5 mm – 100 mm | ASTM B637, AMS 5764 |
| Barres/tiges | Barres rondes, barres carrées | Diamètre : 1 mm – 300 mm | ASTM B637, AMS 5764 |
| Pièces forgées | Blocs, disques, anneaux | Taille : Adapté aux besoins du client | ASTM B637, AMS 5764 |
Soudage et transformation
UDIMET® alloy 720 offers good weldability and processing characteristics:
- Soudage: Peut être soudé en utilisant des méthodes telles que le soudage TIG, MIG et par résistance. Un préchauffage et un traitement thermique après soudage peuvent être nécessaires pour conserver les propriétés.
- Usinabilité : Généralement usiné dans un état recuit en solution à l'aide d'outils en carbure et de fluides de coupe appropriés.
Avantages et inconvénients
| Aspect | Détails |
|---|---|
| Avantages | High strength and toughness at elevated temperatures, excellent oxidation resistance, good creep resistance, and availability in various forms and sizes. |
| Désavantages | Un coût plus élevé par rapport aux alliages de nickel standard nécessite un traitement et une manipulation spécialisés en raison de sa haute résistance et de ses éléments d'alliage. |
Comparaison avec des alliages similaires
UDIMET® alloy 720 (UNS N07200) is often compared with other high-strength nickel-based superalloys such as UDIMET® alloy 718 and UDIMET® alloy 625. Here’s a brief comparison:
| Type/propriété de l'alliage | Alliage UDIMET® 720 | UDIMET® alloy 718 | UDIMET® alloy 625 |
|---|---|---|---|
| Composition chimique | High nickel, cobalt, chromium, with additional alloying elements for high-temperature strength. | High nickel, chromium, and niobium with smaller additions of aluminum and titanium. | High nickel, chromium, and molybdenum with niobium and tantalum for strength and corrosion resistance. |
| Propriétés mécaniques | Higher tensile and yield strength, superior creep resistance at high temperatures. | Lower tensile and yield strength compared to UDIMET® alloy 720, good toughness and fatigue resistance. | Lower tensile and yield strength, excellent fatigue resistance, and good corrosion resistance in various environments. |
| Applications | Gas turbines, aerospace components requiring high-temperature strength and oxidation resistance. | Composants aérospatiaux, boulons et fixations haute température. | Chemical processing equipment, marine applications, and aerospace components requiring corrosion resistance. |
This detailed article introduces UDIMET® alloy 720, highlighting its chemical composition, mechanical properties, performance characteristics, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and a comparison with similar alloys. Engineers and professionals seeking a robust, high-strength superalloy for demanding applications in aerospace, power generation, and chemical processing industries will find UDIMET® alloy 720 suitable for use under extreme conditions.