INCOLOY® Alloy 800H/HT Product Introduction
INCOLOY® alloy 800H and INCOLOY® alloy 800HT are high-temperature alloys known for their excellent corrosion resistance and ability to maintain structural integrity under high-temperature conditions. This article provides a comprehensive introduction to these alloys, covering their chemical composition, mechanical properties, performance characteristics, industry applications, available shapes and sizes, production standards, international grades, welding and machining considerations, polishing techniques, heat treatment processes, cold working capabilities, as well as their advantages, disadvantages, and similar products in the market.
Chemical Composition
The chemical composition of INCOLOY® alloy 800H and INCOLOY® alloy 800HT is crucial for understanding their properties and performance under different conditions. The composition typically includes:
| Element | INCOLOY® alloy 800H Composition (%) | INCOLOY® alloy 800HT Composition (%) |
|---|---|---|
| Nickel (Ni) | 30.0 – 35.0 | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 | 19.0 – 23.0 |
| Iron (Fe) | 39.5 min | 39.5 min |
| Aluminum (Al) | 0.15 – 0.60 | 0.15 – 0.60 |
| Carbon (C) | 0.05 – 0.10 | 0.05 – 0.10 |
| Titanium (Ti) | 0.15 – 0.60 | 0.25 – 0.60 |
| Copper (Cu) | 0.75 max | 0.75 max |
Mechanical Properties
The mechanical properties of INCOLOY® alloy 800H/HT make them suitable for high-temperature applications where strength and durability are essential:
| Property | INCOLOY® alloy 800H | INCOLOY® alloy 800HT |
|---|---|---|
| Tensile Strength (MPa) | 520 – 690 | 600 – 800 |
| Yield Strength (MPa) | 210 – 400 | 220 – 380 |
| Elongation (%) | 30 min | 30 min |
| Hardness (HRC) | ≤ 30 | ≤ 30 |
Performance at Different Temperatures
INCOLOY® alloy 800H/HT exhibit excellent performance across a wide range of temperatures, making them suitable for applications where thermal stability is critical:
| Temperature Range (°C) | INCOLOY® alloy 800H Performance | INCOLOY® alloy 800HT Performance |
|---|---|---|
| Room Temperature | Excellent corrosion resistance | Excellent corrosion resistance |
| Elevated Temperatures | Maintains strength and integrity | High creep and rupture strength |
| High Temperatures | Resistant to oxidation and carburization | Retains mechanical properties |
Industry Applications
These alloys find applications in various industries due to their unique properties:
- Chemical Processing: Heat exchangers, catalyst support grids.
- Power Generation: Steam generator tubing, coal gasification.
- Petrochemical: Ethylene furnace quench boilers, process heaters.
- Heat Treatment: Annealing boxes, radiant tubes.
Shapes, Sizes, and Production Standards
INCOLOY® alloy 800H/HT are available in various forms to meet specific requirements:
- Forms: Sheets, plates, bars, pipes, tubes, fittings.
- Sizes: Customizable based on application needs.
- Production Standards: ASTM B407, ASTM B154, ASTM B163, ASTM B515.
Standards and Corresponding Grades
The alloys adhere to international standards with corresponding grades in different countries:
- United States: ASTM B407/B154/B163/B515.
- Germany: DIN 17459/NFA 49-217.
- Japan: JIS G3459/G3463/G3467.
- China: GB/T 14976/GB/T 14975.
Welding, Machining, Polishing, Heat Treatment, Cold Working
| Process | Details |
|---|---|
| Welding | Use matching filler metals; post-weld heat treatment may be required. |
| Machining | High-speed tools; adequate coolant to prevent work hardening. |
| Polishing | Mechanical polishing recommended; avoid contamination. |
| Heat Treatment | Annealing at specific temperatures; water quenching. |
| Cold Working | Limited due to high work hardening rate; annealing may be required. |
Advantages and Disadvantages
| Advantages | Disadvantages |
|---|---|
| High-temperature strength and corrosion resistance. | Limited cold working capabilities. |
| Wide range of industrial applications. | Costlier than standard stainless steels. |
| Excellent oxidation and carburization resistance. | Susceptible to embrittlement at high temperatures. |
| Good weldability and formability. | Limited availability of large sizes in certain forms. |
Similar Products
| Similar Alloys | Composition | Applications |
|---|---|---|
| INCONEL® alloy 600 | Ni 76.0%, Cr 15.5%, Fe 8.0% | High-temperature furnace components |
| HASTELLOY® alloy X | Ni 47.5%, Cr 22.0%, Fe 18.5%, Mo 9.0% | Gas turbine components, jet engines |
| A286 stainless steel | Fe 25.5%, Ni 15.0%, Cr 13.5%, Ti 2.1%, Mo 1.0% | Aircraft and industrial gas turbine components |
Conclusion
INCOLOY® alloy 800H/HT are versatile materials known for their high-temperature strength, corrosion resistance, and wide applicability across various industries. Understanding their chemical composition, mechanical properties, performance characteristics, and production standards is crucial for selecting the right alloy for specific applications. While they offer significant advantages, careful consideration of their limitations and processing requirements is essential to maximize their performance.
This comprehensive introduction aims to provide a detailed overview of INCOLOY® alloy 800H/HT, highlighting their capabilities, applications, and operational considerations across global markets.