ASTM B407 Inconel 800H Nickel Iron Chromium Alloy Seamless Steel Tube For Heat Exchangers
ASTM B407 Inconel 800, 800H, 800HT Nickel Iron Chromium Alloy Seamless Steel Tube for Heat Exchangers
Material
Inconel 800, 800H, and 800HT are nickel-iron-chromium alloys known for their excellent strength and resistance to oxidation and carburization at elevated temperatures. These alloys are commonly used in the production of seamless steel tubes for heat exchangers, where they provide superior performance in high-temperature environments.
Specification
ASTM B407 is the standard specification for seamless, cold-worked, and hot-finished nickel-iron-chromium alloy pipes and tubes. This specification covers the requirements for the chemical composition, mechanical properties, and dimensions of the tubes, ensuring they meet the necessary standards for industrial applications.
Key Features
- High Temperature Resistance: Inconel 800 series alloys maintain their strength and stability at high temperatures, making them ideal for heat exchangers.
- Corrosion Resistance: These alloys offer excellent resistance to oxidation and carburization.
- Durability: The alloys' robust nature ensures long service life in demanding environments.
- Versatility: Suitable for a wide range of applications, including petrochemical and power generation industries.
Chemical Composition
The chemical composition of Inconel 800, 800H, and 800HT is crucial for their performance. Below is a table presenting the typical composition:
| Element | Inconel 800 | Inconel 800H | Inconel 800HT |
|---|---|---|---|
| Nickel (Ni) | 30-35% | 30-35% | 30-35% |
| Chromium (Cr) | 19-23% | 19-23% | 19-23% |
| Iron (Fe) | 39.5% min | 39.5% min | 39.5% min |
| Carbon (C) | 0.10% max | 0.05-0.10% | 0.06-0.10% |
| Aluminum (Al) | 0.15-0.60% | 0.15-0.60% | 0.25-0.60% |
| Titanium (Ti) | 0.15-0.60% | 0.15-0.60% | 0.25-0.60% |
Mechanical Properties
The mechanical properties of these alloys are essential for their application in heat exchangers. The table below outlines the typical properties:
| Property | Inconel 800 | Inconel 800H | Inconel 800HT |
|---|---|---|---|
| Tensile Strength (MPa) | 450 min | 450 min | 450 min |
| Yield Strength (MPa) | 170 min | 170 min | 170 min |
| Elongation (%) | 30 min | 30 min | 30 min |
Steel Grade
The Inconel 800 series is classified under the nickel-iron-chromium alloy category, specifically designed to withstand high temperatures and corrosive environments. The grades 800, 800H, and 800HT differ mainly in their carbon content and annealing treatment, which affect their mechanical properties and suitability for different applications.
Application
Inconel 800 series alloys are widely used in various industries due to their high-temperature capabilities and corrosion resistance. Common applications include:
- Heat exchangers
- Process piping
- Chemical and petrochemical processing
- Power generation
- Nuclear steam generators
Possible Alternative Grades
While Inconel 800 series alloys are highly effective, alternative materials may be considered depending on specific requirements:
- Incoloy 825: Offers excellent resistance to reducing and oxidizing acids.
- Hastelloy C276: Known for its resistance to a wide range of corrosive environments.
- Stainless Steel 310: Provides good oxidation resistance and strength at high temperatures.
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