Hastelloy G stands as a family of nickel-chromium-iron-molybdenum alloys.It provides superb corrosion resistance in a wide range of chemical environments.A top choice emerges for applications where standard tuyaux en acier inoxydable ou raccords de tuyauterie en acier inoxydable échouerait.
Introduction to the Hastelloy G Series
Qu'est-ce que l'alliage Hastelloy ?
Alliage Hastelloy contains a high proportion of nickel, and also contains chromium and molybdenum. The family includes three main series. They are the B series, C series, and G series. Each is designed for specific environments.
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Key Advantages of Hastelloy G Series
A mix of acids is handled well by this alloy. Resistance to both oxidizing and reducing media is a key benefit. Superior performance is delivered against sulfuric and phosphoric acids.
Corrosion par piqûres et corrosion par crevasses are actively fought by the alloy’s composition. For this reason, it is often a better option than many stainless steels.
Easy fabrication is a major benefit. Strong welds are formed without losing properties. Complex pipes and fittings are thus simpler to create.
A low teneur en carbone prevents sensibilisation after welding. This ensures the alloy retains its corrosion resistance. The material performs well in the heat-affected zone.
Key Disadvantages of Hastelloy G Series
The composition contains expensive nickel and molybdenum, whose addition drives up the price.
This alloy material has a high density, which increases the system’s weight. Its high-density characteristics must be considered during design and support structure planning.
High hardness leads to machining difficulties, requiring specialized tools and machining speeds, thereby increasing manufacturing time and costs.
Good high-temperature resistance is present in the alloy. However, a primary choice for high-strength, high-temperature applications is not a role it plays. The alloy lacks the properties of other superalloys for structural use at high heat.
The Natural Degradation Process of Hastelloy G
- Creep and Stress Fracture: High temperatures and sustained stress can cause slow, permanent deformation known as creep. Over time, this may ultimately lead to failure. Alloy strength gradually diminishes with prolonged exposure.
- Fatigue: Repeated stress cycles may induce microcracks in components. These cracks progressively propagate, eventually causing component failure.
- Long-Term Corrosion: Despite high corrosion resistance, prolonged exposure to highly corrosive chemicals can degrade the material. Over time, pitting corrosion or surface thinning may occur. While extremely slow, this process is a natural phenomenon within the alloy’s lifecycle.
- Erosion-Corrosion: Environments involving high-velocity fluid flow induce a specific form of degradation. The combined effects of erosion and corrosion continuously wear down the alloy, potentially shortening its service life in certain applications.
Common Hastelloy G Grades
| Grade | Éléments clés | Avantage principal |
|---|---|---|
| Hastelloy G3 | Cr/Fe/Mo | Se soude facilement, résiste aux piqûres |
| Hastelloy G30 | Cr/Fe/Mo | Résistance à l'acide phosphorique |
| Hastelloy G35 | Cr/Fe/Mo | Haute résistance, résiste aux chlorures |
| Hastelloy G50 | Cr/Fe/Mo | Bon pour l'acide sulfurique à haute température |
Hastelloy G VS Stainless Steel
| Caractéristique | Hastelloy G | Acier inoxydable |
|---|---|---|
| Mixed Acids | Excellent | Pauvre |
| Pitting and Crevice Corrosion | Excellent | Bon |
| Résistance aux chlorures | Excellent | Bon |
| Coût | Très élevé | Moyen |
| Utilisation principale | Phosphoric Acid Environments | Résistance générale à la corrosion |
Hastelloy G Series in Piping Systems
- Chemical Processing: Extreme corrosion resistance is provided by Hastelloy G for critical stainless steel pipe fittings. Your system works perfectly, even with aggressive acid mixtures.
- Fertilizer Production: The alloy is perfect for handling wet-process phosphoric acid. It withstands highly corrosive chemicals. Efficient and safe operation is ensured by its use.
- Flue Gas Desulfurization: A key use for this alloy. It resists corrosive environments found in power plants. Its high resistance protects pipes and fittings.
- Waste Treatment: The material is essential for pipes and fittings in waste treatment. Hastelloy G handles corrosive chemicals. The alloy maintains its integrity. This prevents leaks and costly downtime.
Approvisionnement et fabrication d'alliages Hastelloy
Un complet Rapport d'essai des matériaux (MTR) est nécessaire. Il vérifie la composition précise de l'alliage et garantit ses performances.
Travailler avec fournisseurs spécialisés de tubes et raccords en acier inoxydable. Ils connaissent ces aciers alliés et peuvent garantir une fabrication et un contrôle de qualité adéquats. ISO 9001 et CE-PED certifié.
Cet alliage nécessite des procédures spécifiques. Une technique de soudage appropriée garantit l'intégrité de la soudure.
Il est coûteux, il est donc important d'évaluer si le produit a une durée de vie plus longue. Cela peut justifier son coût initial plus élevé.
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