Inconel 601 and Incoloy 800H materials
Inconel 601 and Incoloy 800H materials
Inconel 601 and Incoloy 800H are both high-performance nickel-based alloys used in extreme high-temperature environments, but they differ in composition and main strength characteristics: Inconel 601 is a Ni-Cr-Al-Fe alloy with a high nickel content (>60%), possessing excellent oxidation/carburization resistance and high-temperature strength, and is commonly used in furnace components; Incoloy 800H is an Fe-Ni-Cr alloy (with a nickel content of approximately 30%), with controlled levels of carbon, aluminum, and titanium, exhibiting superior creep/rupture strength and good corrosion resistance, making it an ideal material for the petrochemical industry and steam generators. The key difference is that Inconel 601 focuses on surface protection (through the addition of aluminum), while the "H" version of Incoloy 800H emphasizes improved creep resistance (by controlling the content of carbon, aluminum, and titanium) to suit long-term stress environments.
What are the uses of Inconel 601?
The properties of INCONEL 601 alloy make it widely used in heat treatment, chemical processing, pollution control, aerospace, and power generation. 601 alloy is a common structural material for various heat treatment equipment.
Inconel 601 (UNS N06601)
Composition: High nickel (>60%), chromium (approximately 21-25%), aluminum (approximately 1-1.7%), iron (balance).
Main advantages: Excellent high-temperature strength, superior oxidation and carburization resistance (due to the presence of aluminum).
Applications: Heat treatment, furnace components, gas turbine components, petrochemical processing.
Incoloy 800H (UNS N08810)
Composition: Iron-nickel-chromium alloy (approximately 30-35% nickel, approximately 19-23% chromium), with controlled carbon content (minimum 0.05%), aluminum, and titanium.
Main advantages: High creep rupture strength, good resistance to high-temperature oxidation, carburization, and chloride stress corrosion cracking.
Applications: Steam generator tubes, furnace components, petrochemicals, power generation, heat treatment equipment.
Comparison of the chemical compositions of Inconel 601 and Incoloy 800H
| Element | Inconel 601 (UNS N06601) | Incoloy 800H (UNS N08810) |
|---|---|---|
| Nickel (Ni) | 58.0 – 63.0 % | 30.0 – 35.0 % |
| Chromium (Cr) | 21.0 – 25.0 % | 19.0 – 23.0 % |
| Iron (Fe) | Balance | ≥ 39.5 % |
| Aluminum (Al) | 1.0 – 1.7 % | 0.15 – 0.60 % |
| Carbon (C) | ≤ 0.10 % | 0.05 – 0.10 % |
| Manganese (Mn) | ≤ 1.0 % | ≤ 1.5 % |
| Silicon (Si) | ≤ 0.5 % | ≤ 1.0 % |
| Copper (Cu) | ≤ 1.0 % | ≤ 0.75 % |
| Titanium (Ti) | ≤ 0.15 % | 0.15 – 0.60 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
| Phosphorus (P) | – | ≤ 0.045 % |
| Nitrogen (N) | – | – |
Comparison of mechanical properties of Inconel 601 and Incoloy 800H
| Property | Inconel 601 (Annealed) | Incoloy 800H (Annealed) |
|---|---|---|
| Tensile Strength (MPa, min) | 655 – 895 | 450 – 585 |
| Yield Strength (0.2% Offset, MPa, min) | 345 | 170 – 310 |
| Elongation (% in 50 mm, min) | 30 | 30 |
| Hardness (Rockwell B) | 95 HRB max | 79 – 95 HRB |
| Hardness (Brinell HB) | 150 – 220 HB | 120 – 190 HB |
| Density (g/cm³) | 8.11 | 7.94 |
| Melting Range (°C) | 1300 – 1370 | 1350 – 1400 |
| Modulus of Elasticity (GPa) | 210 | 200 |
| Maximum Service Temperature (Continuous, in Air) | ~1250°C | ~1150°C |
| Thermal Conductivity (W/m·K, at 20°C) | 11.2 | 11.8 |
| Coefficient of Thermal Expansion (×10⁻⁶/K, 20–100°C) | 12.6 | 14.4 |
| Creep Resistance | Excellent | Very Good |
| Oxidation Resistance | Excellent (high Al content) | Very Good |
| Fatigue Strength | Good | Good |
Comparison of applications for Inconel 601 and Incoloy 800H
| Field / Application | Inconel 601 | Incoloy 800H |
|---|---|---|
| Industrial Furnaces & Heat Treatment | Radiant tubes, muffles, annealing boxes, furnace rollers, thermocouple protection tubes | Radiant tubes, furnace muffles, retorts, conveyor belts, heat exchanger tubes |
| Chemical & Petrochemical Processing | Catalyst grids, reactor internals, high-temperature chlorination equipment | Steam reformers, pyrolysis tubes, cracking furnace tubes, waste heat boilers |
| Power Generation | Combustor liners, heat exchanger tubes, boiler components | Superheater tubes, reheater tubes, boiler headers, steam piping |
| Aerospace & Gas Turbines | Combustion chambers, afterburner components, turbine seals | Combustor liners, exhaust ducts, turbine casings |
| Pollution Control & Incineration | Waste incinerator internals, flue gas ducting, scrubber components | Incinerator grates, waste heat recovery systems, exhaust stacks |
| Glass & Ceramic Manufacturing | Sintering trays, kiln furniture, glass melting furnace components | Glass tank reinforcements, molding equipment, kiln rollers |
| Steel & Metal Processing | Annealing covers, roller hearths, soaking pit linings | Continuous annealing lines, galvanizing pots, heat treating baskets |
| Nuclear Energy | Control rod guide tubes, reactor core components (high-temperature) | Steam generator tubing, heat exchanger components |
| Marine & Offshore | – | Seawater cooling systems, offshore heat exchangers |
| Automotive & Exhaust Systems | High-performance exhaust manifolds, turbocharger housings | Exhaust gas recirculation (EGR) systems, catalytic converter shells |
Main differences between Inconel 601 and Incoloy 800H:
Nickel content: 601 has a significantly higher nickel content, making it more of a "nickel alloy"; 800H is an "iron-nickel-chromium" alloy.
Strengthening mechanism: 800H utilizes carbon, aluminum, and titanium to strengthen grain boundaries, thereby improving creep resistance; 601 primarily relies on its nickel-chromium-aluminum matrix for improved oxidation resistance.
Optimal applications: 601 performs excellently in pure high-temperature/oxidizing environments; 800H exhibits better mechanical integrity when subjected to stress for extended periods at high temperatures.
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