ASTM B407 UNS N08810 (800H) Seamless Nickel-Iron-Chromium Alloy Tube
ASTM B407 UNS N08810 (Incoloy 800H) is a nickel-iron-chromium alloy used to manufacture seamless pipes, exhibiting extremely high resistance to high-temperature oxidation, corrosion, and creep. Its key characteristics include high-temperature stability, good strength, and weldability, making it ideal for applications such as heat exchangers, furnace components, and petrochemical process piping. The "H" in 800H indicates that its carbon content is higher than the standard 800 grade, thus enhancing its creep resistance.
What are the differences between Inconel 800 and 800H?
Generally speaking, Alloy 800 exhibits superior mechanical properties at room temperature and under short-term high-temperature exposure, while Alloys 800H and 800HT demonstrate superior creep strength and fracture strength under prolonged high-temperature exposure.
ASTM B407 UNS N08810 (800H) Nickel-Iron-Chromium Alloy Seamless Tube
This product is a seamless tube manufactured according to ASTM B407 standard using a nickel-iron-chromium alloy (UNS N08810, commonly known as 800H). This alloy is specifically designed to withstand extreme high temperatures and corrosive environments. Its key "H" designation indicates that the alloy undergoes a specific heat treatment (solution annealing) to obtain a coarse-grained structure, significantly improving its creep strength and fracture strength at high temperatures. It has the same basic composition as Incoloy 800, but with significantly higher creep strength.
This seamless tube is highly valued for its excellent oxidation resistance, carburization resistance, and outstanding stability under high stress and high temperature conditions. This higher strength is achieved through precise control of the carbon, aluminum, and titanium content combined with heat treatment processes. It is used in petrochemical processes, power plant heaters and reheater piping, industrial furnaces, and heat treatment equipment.
Chemical and mechanical properties
| ASTM B407 UNS N08810 Chemical Composition (%) | ||||||||
|
Ni |
Cr |
Fe |
Mn |
Cu |
Si |
S |
Al | Ti |
|
30%-35% |
19%-23% | ≥39.5% | ≤1.5% | ≤0.75% | 1.0% | ≤0.015% | 0.15%-0.60% | 0.15%-0.60% |
Mechanical Properties
| Property | Standard Value |
|---|---|
| Tensile Strength | 450 MPa |
| Yield Strength (0.2% offset) | 170 MPa |
| Elongation | 30% |
| Condition(Temper) | hot-finished annealed or cold-worked annealed |
| Operating temperature |
≥ 593℃ |
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.
