Incoloy 800 nickel alloy tube with pickled and annealed surface
Incoloy 800 nickel alloy tube with pickled and annealed surface
Pickled and annealed Incoloy 800 nickel alloy tubing exhibits excellent high-temperature strength and superior corrosion resistance, particularly in its resistance to oxidation, carburization, and stress corrosion cracking. The pickling and annealing process further enhances the material's properties, enabling it to meet the demands of demanding industrial applications.
What is the difference between Alloy 800 and Incoloy 800?
The fundamental difference between Incoloy 800 and Alloy 800 lies in their composition. Incoloy 800 is an austenitic nickel-iron-chromium alloy, with titanium and aluminum added to stabilize its structure. Its chromium content is typically higher than that of Alloy 800, ranging from 19.0% to 23.0% by weight.
Incoloy 800, 800H, and 800HT are all nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization, especially at high temperatures. These nickel-based steel alloys are essentially the same, except that 800H has a higher carbon content and 800HT has up to 1.20% aluminum and titanium added. Incoloy 800 was the first of these alloys, later slightly modified to become Incoloy 800H. This modification aimed to control the carbon content (0.05-0.10%) and grain size to optimize its resistance to stress fracture. Incoloy 800HT further increases the titanium and aluminum content (0.85-1.20%) to ensure optimal high-temperature performance. This nickel-based alloy is dual-certified (800H/HT), combining the characteristics of both alloys. The Incoloy 800H/HT alloy is specifically designed for high-temperature structural applications. The nickel content gives these alloys extremely high resistance to chloride stress corrosion cracking and σ-phase precipitation embrittlement. Their overall corrosion resistance is excellent. In the solution-annealed state, 800H and 800HT alloys exhibit superior creep and stress fracture properties. Currently, most suppliers, including Mega Mex, only offer dual-certified 800H/HT alloys.
Incoloy 800 is primarily used for applications with temperatures not exceeding 1100°F, while 800H and 800HT alloys are typically used for applications with temperatures above 1100°F, where excellent creep and fracture resistance is required. Their balanced chemical composition gives these nickel-based steel alloys excellent resistance to carburizing, oxidation, and nitriding. Even with prolonged use in the high-temperature range of 1200–1600°F, Incoloy 800HT does not become embrittled, unlike many stainless steels which do at this temperature. Nickel-chromium alloys typically possess excellent cold-forming properties, and 800HT is one such example. After prolonged cold forming, the grain size develops a visible wavy surface, known as "orange peel." Incoloy 800HT can be welded using methods commonly used for stainless steel.
| Alloy | Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar | Forging | Fitting |
|---|---|---|---|---|---|---|---|---|
| Alloy 800 (UNS N08800) | B407 | B154 | B163 | B515 | B409 | B408 | B564 | B366 |
| Alloy 800H (UNS N08810) | B407 | B154 | B163 | B515 | B409 | B408 | B564 | B366 |
| Alloy 800HT (UNS N08811) | B407 | B154 | B163 | B515 | B409 | B408 | B564 | B366 |
Alloy 800 (UNS N08800) Chemical Composition, %
| Ni | Cr | Fe | C | Al | Ti | Al+Ti |
|---|---|---|---|---|---|---|
| 30.0-35.0 | 19.0-23.0 | 39.5 min | .10 max | .15-.60 | .15-.60 | .30-1.20 |
Alloy 800H (UNS N08810) Chemical Composition, %
| Ni | Cr | Fe | C | Al | Ti | Al+Ti |
|---|---|---|---|---|---|---|
| 30.0-35.0 | 19.0-23.0 | 39.5 min | .05-.10 | .15-.60 | .15-.60 | .30-1.20 |
Alloy 800HT (UNS N08811) Chemical Composition, %
| Ni | Cr | Fe | C | Al | Ti | Al+Ti |
|---|---|---|---|---|---|---|
| 30.0-35.0 | 19.0-23.0 | 39.5 min | .06-.10 | .25-.60 | .25-.60 | 0.85-1.2 |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy 800/800H/800HT alloy tubes/bars/plates/fittings, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical properties certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneesteel.com
Gnee Steel is a supplier of Incoloy 800/800H/800HT steel, 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 800 series alloys, meeting or exceeding numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Incoloy 800/800H/800HT steel, including 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.
