Inconel Products
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Stellar Alloys is a prominent supplier of Inconel products that has a wide variety of high-performance nickel-chromium superalloys that are designed to work in the extreme environment. We also have pipes, tubes, plates, sheets, flanges, fittings and bars in all major grades, which are 600, 625, 718, 800, 800H, 800HT and 825. Inconel alloys are used in the aerospace, chemical processing, oil and gas, power generation, and marine sectors, with superior heat resistance to 2000°F (1093°C), excellent oxidation protection and excellent corrosion protection. Being a reliable manufacturer and supplier of Inconel, we offer certified materials of ASTM/ASME standard with full mill test certificates, PMI testing and worldwide shipping to assure quality and reliability in your critical applications.
Table of Contents
- Introduction to Inconel Products
- Inconel Grades Overview
- Standard Specifications
- Chemical Composition Comparison (%)
- Mechanical Properties (Typical at Room Temp)
- Key Applications by Industry
- Heat Treatment Processes
- Why Choose Stellar Alloys for Inconel Products?
- Quality Assurance & Testing
- Stock Availability
- Frequently Asked Questions
Available Grades of Inconel Alloy
Inconel Pipes & Tubes
Seamless and welded pipes in all grades including 600, 625, 800, and 825.
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Inconel Plates & Sheets
High-quality plates, sheets, and coils for fabrication and structural use.
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Inconel Flanges & Fittings
Complete range of forged fittings, flanges, and pipe fittings.
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Introduction to Inconel Products
The Inconel is a series of austenitic nickel-chromium based superalloys with outstanding performance in severe environments. They were originally designed by Special Metals Corporation and are made to resist immense heat, pressure and corrosion conditions in which standard stainless steels and other metals cannot endure.
The first aspect of the Inconel products is the capacity to maintain high mechanical strength and toughness at high temperatures (up to 2000°F / 1093°C). Inconel also does not disintegrate like many other materials when subjected to heat, instead it forms a stable, passivating oxide layer that prevents the surface from further attack. This is what makes it the material of choice in aerospace, chemical processing and nuclear industries.
Stellar Alloys is a company that produces and supplies Inconel products of high quality and globally. Our total inventory includes pipes, tubes, plates, sheets, bars, and fittings in all the major grades such as 600, 601, 625, 718, 800, 800H/HT and 825. We produce our products with rigorous ASTM, ASME and API standards in order to achieve reliability in high-pressure applications.
Inconel Pipes & Tubes
Our Inconel pipes and tubes are available in both seamless and welded configurations, suitable for heat exchangers, condensers, and process piping.
| Specification | Details |
| Size Range | Seamless: 15 NB to 600 NB Tubes: 1mm OD to 254mm OD |
| Schedules | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Standards | ASTM B167, ASME SB167, B407, B444, B423, B829 |
| Types | Seamless, Welded, ERW, EFW, CDW |
| Key Grades | Inconel 600, Inconel 625, Inconel 718, Incoloy 800/800H, Incoloy 825 |
Inconel Plates & Sheets
We stock a wide range of Inconel plates, sheets, and coils for fabrication of pressure vessels, tanks, and structural components.
| Specification | Details |
|
Thickness |
0.5mm to 100mm |
|
Width |
1000mm, 1219mm, 1500mm, 2000mm, 2500mm |
|
Length |
2000mm, 2440mm, 3000mm, 6000mm (Custom cut available) |
|
Finish |
2B, BA, No.4, Hairline, Mirror, Hot Rolled (HR) |
|
Standards |
ASTM B168, B162, B409, ASME SB168 |
|
Key Grades |
Inconel 600, Inconel 625, Inconel 718 |
Inconel Flanges & Fittings
High-pressure flanges and pipe fittings manufactured to precise tolerances for leak-free connections.
| Specification | Details |
|
Types |
Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint |
|
Standards |
ASME B16.5, B16.47, B16.9, B16.11 |
|
Pressure Class |
150#, 300#, 600#, 900#, 1500#, 2500# |
|
Fittings |
Elbows, Tees, Reducers, Caps, Stub Ends, Unions |
Inconel Grades Overview
Grade | UNS No. | Key Features | Temp Range | Primary Applications |
N06600 | Excellent oxidation resistance, immune to chloride stress cracking. | Up to 2000°F | Chemical processing, heat treating, furnace components. | |
Inconel 601 | N06601 | Added aluminum for outstanding high-temp oxidation resistance. | Up to 2200°F | Thermal processing, petrochemical furnaces. |
N06625 | High strength, excellent fabricability, outstanding corrosion resistance. | Cryogenic to 1800°F | Marine, aerospace, pollution control, nuclear. | |
N07718 | Age-hardenable, extremely high strength, good weldability. | -423°F to 1300°F | Gas turbine engines, rocket motors, fasteners. | |
Incoloy 800/H | N08800/10 | Resists high-temp corrosion, oxidation, and carburization. | Up to 1500°F | Petrochemical, power generation, sheathing. |
N08825 | Superior resistance to sulfuric and phosphoric acids. | Up to 1000°F | Chemical processing, acid production, pickling. |
Standard Specifications
Product Form | ASTM Standards | ASME Standards |
Pipes & Tubes | ASTM B167, B407, B444, B423, B829, B705 | ASME SB167, SB407, SB444, SB423, SB829 |
Plates & Sheets | ASTM B168, B409, B424, B906 | ASME SB168, SB409, SB424 |
Bars & Rods | ASTM B166, B408, B425, B637 | ASME SB166, SB408, SB425 |
Fittings | ASTM B366 | ASME SB366 |
Forgings | ASTM B564 | ASME SB564 |
Chemical Composition Comparison (%)
Grade | Ni | Cr | Fe | Mo | Nb | Cu | Al | Ti |
600 | 72.0 min | 14.0-17.0 | 6.0-10.0 | – | – | 0.5 max | – | – |
625 | 58.0 min | 20.0-23.0 | 5.0 max | 8.0-10.0 | 3.15-4.15 | – | 0.4 max | 0.4 max |
718 | 50.0-55.0 | 17.0-21.0 | Balance | 2.8-3.3 | 4.75-5.5 | 0.3 max | 0.2-0.8 | 0.65-1.15 |
800 | 30.0-35.0 | 19.0-23.0 | 39.5 min | – | – | 0.75 max | 0.15-0.60 | 0.15-0.60 |
825 | 38.0-46.0 | 19.5-23.5 | 22.0 min | 2.5-3.5 | – | 1.5-3.0 | 0.2 max | 0.6-1.2 |
Mechanical Properties (Typical at Room Temp)
Grade | Tensile Strength (min) | Yield Strength (min) | Elongation (%) | Hardness (Max) |
600 | 550 MPa (80 ksi) | 240 MPa (35 ksi) | 30% | 88 HRB |
625 | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30% | 25 HRC |
718 (Aged) | 1275 MPa (185 ksi) | 1034 MPa (150 ksi) | 12% | 36 HRC |
800 | 520 MPa (75 ksi) | 205 MPa (30 ksi) | 30% | 192 HB |
825 | 586 MPa (85 ksi) | 241 MPa (35 ksi) | 30% | 200 HB |
Key Applications by Industry
- Aerospace & Aviation : Jet engine exhaust systems, turbine blades, afterburners, and engine thrust reversers utilize Inconel 718 and 625 for their high creep-rupture strength at extreme temperatures.
- Chemical Processing : Reactors, heat exchangers, evaporators, and transfer piping handling alkalies, fatty acids, and chlorides. Inconel 600 and Incoloy 825 are standard materials.
- Oil & Gas : Downhole tubing, wellhead components, and subsea pipelines in sour gas (H2S) environments. Inconel 625 and 718 provide necessary corrosion resistance and strength.
- Power Generation : Nuclear reactor components, steam generator tubing, ash handling systems, and superheater tubing in waste-to-energy boilers utilize Incoloy 800H/HT.
- Marine Engineering : Propeller shafts, submarine auxiliary propulsion motors, and exhaust systems exposed to seawater. Inconel 625 offers virtual immunity to chloride pitting.
- Thermal Processing : Furnace muffles, retorts, radiant tubes, and heat treating baskets. Inconel 600 and 601 resist oxidation and carburization at red-heat temperatures.
Heat Treatment Processes
Proper heat treatment is critical to achieving the desired properties in Inconel alloys.
- Solution Annealing: Typically performed between 925°C and 980°C (1700°F – 1800°F) followed by rapid cooling to dissolve carbides and maximize corrosion resistance.
- Precipitation Hardening (Age Hardening): Used for grades like Inconel 718. Involves heating to ~720°C, holding, furnace cooling to ~620°C, and holding again to form strengthening precipitates.
- Stress Relieving: Performed after cold working or welding to reduce residual stresses and prevent distortion or stress corrosion cracking.
Why Choose Stellar Alloys for Inconel Products?
Stellar Alloys is a trusted partner for critical superalloy requirements.
- Comprehensive Inventory: Extensive stock of pipes, plates, and bars in all major Inconel grades.
- Certified Quality: All materials come with Mill Test Certificates (EN 10204 3.1) and adhere to ASTM/ASME standards.
- Global Logistics: Fast shipping and export packaging to over 40 countries worldwide.
- Technical Expertise: Our metallurgists provide guidance on grade selection and fabrication.
- Custom Solutions: In-house cutting, beveling, and fabrication services to meet specific project needs.
Quality Assurance & Testing
We perform rigorous testing to ensure material integrity:
- Positive Material Identification (PMI)
- Ultrasonic Testing (UT)
- Hydrostatic Testing
- Intergranular Corrosion Testing
- Tensile & Hardness Testing
- Radiography (RT) for welds
- Impact Testing (Charpy V-Notch)
- Microstructure Analysis
Stock Availability
We maintain ready stock of common sizes for immediate dispatch:
- Inconel 600 Pipes, Sheets, Bars
- Inconel 625 Seamless Pipes, Plates
- Inconel 718 Round Bars, Sheets
- Incoloy 800H/HT Heater Tubes, Plates
- Incoloy 825 Pipes, Fittings
Frequently Asked Questions
Inconel is primarily composed of Nickel (usually 50%+) and Chromium (15-25%), with additions of Iron, Molybdenum, Niobium, and Cobalt depending on the specific grade. This composition provides its superalloy properties.
Inconel 600 is a solid-solution alloy used for general corrosion and heat resistance. Inconel 625 contains added molybdenum and niobium, providing significantly higher strength and better resistance to pitting and crevice corrosion, especially in seawater.
Yes, but it requires specific procedures. Inconel can be prone to cracking during welding. Gas Tungsten Arc Welding (GTAW/TIG) is commonly used with matching filler metals like Inconel 625 or 82 (ERNiCrMo-3 or ERNiCr-3).
It depends on the grade. Inconel 600 and 601 withstand oxidation up to 2000-2200°F (1093-1200°C). Inconel 718 retains high strength up to 1300°F (700°C).
Both are high-performance nickel alloys. Inconel is generally superior for high-temperature oxidation resistance, while Hastelloy (especially C-276) is often preferred for severe chemical corrosion resistance in reducing acids.
Inconel alloys are predominantly nickel-based (>50% Ni), while Incoloy alloys have a lower nickel content (<50% Ni) and higher iron content, making them more cost-effective for certain applications while still offering excellent performance.
Most Inconel grades are non-magnetic at room temperature. This property is beneficial for applications requiring materials that do not interfere with magnetic fields.
The high cost is due to the high content of expensive alloying elements like Nickel and Molybdenum, complex manufacturing processes (vacuum induction melting), and difficulty in machining/forming compared to steel.