What is the difference between Incoloy 800 and Incoloy 800H?
The main difference lies in the fact that Incoloy 800H has a controllable higher carbon content and undergoes solution heat treatment, which gives it superior creep strength and stress fracture strength compared to Incoloy 800 at high temperatures. Incoloy 800 is typically used for medium-high temperature applications, while Incoloy 800H is better suited for long-term high-temperature service, above 1100°F (593°C).
What is the maximum operating temperature of INCOLOY 800H?
The 800H alloy is a solution-treated (2100°F/1150°C) version of the 800 alloy, employing a controlled carbonization process and exhibiting superior high-temperature performance. Its creep and stress-fracture properties are significantly improved within a temperature range of 1100°F (593°C) to 1800°F (982°C).
Incoloy 800
Composition: A standard iron-nickel-chromium alloy with a carbon content up to 0.10%.
Processing: Untreated.
Properties: Good resistance to oxidation and carburization; moderate strength at room temperature.
Applications: Suitable for general high-temperature applications, such as heat exchangers, process piping, and certain industrial furnace components.
Incoloy 800H
Composition: A derivative of Alloy 800 with a carbon content controlled between 0.05-0.10% and specific grain size control.
Processing: Treated at 2100°F (1150°C).
Properties: Excellent creep strength and stress fracture strength at high temperatures.
Applications: Designed for prolonged exposure to high-temperature environments, such as reformers in petrochemicals, superheaters and reheaters in power generation, and high-temperature chemical equipment.
Incoloy 800/800H Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| Incoloy 800 | 1.4876 | N08800 | NCF 800 | NA 15 | ЭИ670 | Z8NC32-21 | X10NiCrAlTi32-20 |
| Incoloy 800H | 1.4958 / 1.4876 | N08810 | NCF 800H | NA 15(H) | ЭИ670 | Z8NC33-21 | X5NiCrAlTi31-20 |
Alloy 800/800H Chemical Composition
| Element | Alloy 800 | Alloy 800H | |
| C | 0.10 max | 0.05 – 0.10 | |
| Mn | 1.50 max | 1.50 max | |
| Si | 1.00 max | 1.00 max | |
| S | 0.015 max | 0.015 max | |
| Cu | 0.75 max | 0.75 max | |
| Fe | 39.50 min | 39.50 min | |
| Ni | 30.00 – 35.00 | 30.00 – 35.00 | |
| Cr | 19.00 – 23.00 | 19.00 – 23.00 |
Incoloy Alloy 800/800H Mechanical & Physical Properties
| Element | Incoloy Alloy 800/800H/800HT |
| Density | 7.94 g/cm3 |
| Melting Point | 1385 °C (2525 °F) |
| Tensile Strength | Psi – 75,000 , MPa – 520 |
| Yield Strength (0.2%Offset) | Psi – 30,000 , MPa – 205 |
| Elongation | 30 % |
High Temperature Strength:
Incoloy 800: Primarily used for applications below 1100℉.
Incoloy 800H: Typically used for high-temperature applications above 1100℉, requiring good creep and fracture resistance.
The balanced chemical composition endows these nickel-based steel alloys with excellent resistance to carburizing, oxidation, and nitriding.
Incoloy 800/800H Standards and Specifications
| Product Form | Standards and Specifications |
|---|---|
| Bar/Rod | ASTM B408 & SB 408, ASTM B564 & SB 564, ASME Code Case 1325, ISO 9723, 9724, 9725, VdTÜV 412 & 434, DIN 17460, EN 10095 |
| Wire | ASTM B408, AMS 5766, ISO 9723, ISO 9724, BS 3076NA15, BS 3075NA15, EN 10095, VdTÜV 412 & 434, AWS A5.11 ENiCrFe-2, AWS A5.14 ERNiCr-3 |
| Strip/Coil | ASTM B409/B906, ASME SB409/SB906, ASME Code Case 1325, 2339, BS 3073NA15, SEW 470, VdTÜV 412 & 434, DIN 17460, EN 10028-7 & EN 10095 |
| Sheet/Plate | ASTM B409, AMS 5877, BS 3072NA15, BS 3073NA15, VdTÜV 412 & 434, DIN 17460, EN 10028-7, EN 10095 |
| Pipe/Tube | ASTM B163/SB163, ASTM B407/B829, ASME SB407/SB829, ASTM B514/B775, ASME SB514/SB775, ASTM B515/B751, ASME SB515/SB751, 1325 and 1983, BS 3074NA15 |
| Fitting | ASTM B366 |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of Incoloy 800/800H alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Incoloy 800/800H alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Incoloy 800/800H, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
