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Quality High Temperature Creep Resistant Incoloy 800HT Tube UNS N08811 Nickel Iron Chromium Alloy factory
Quality High Temperature Creep Resistant Incoloy 800HT Tube UNS N08811 Nickel Iron Chromium Alloy factory

High Temperature Creep Resistant Incoloy 800HT Tube UNS N08811 Nickel Iron Chromium Alloy

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: Incoloy 800 / Incoloy 800H / Incoloy 800HT / Incoloy 825 / Hastelloy C-276 / Hastelloy C-22 / Inconel 625 / Inconel 718
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Creep Resistant Incoloy 800HT Tube

High Temperature Incoloy 800HT Tube

N08811 Nickel Iron Chromium Alloy
Product Summary
UNS N08811 is a nickel-iron-chromium alloy specifically designed for high-temperature service with exceptional creep and rupture strength. It is a controlled chemistry version of UNS N08800 (Alloy 800), with tighter limits on carbon (0.06-0.10%), aluminum (0.15-0.60%), and titanium (0.15-0.60%) to ...

Product Details

Highlight:

Creep Resistant Incoloy 800HT Tube

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High Temperature Incoloy 800HT Tube

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N08811 Nickel Iron Chromium Alloy
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: Incoloy 800 / Incoloy 800H / Incoloy 800HT / Incoloy 825 / Hastelloy C-276 / Hastelloy C-22 / Inconel 625 / Inconel 718
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

UNS N08811 is a nickel-iron-chromium alloy specifically designed for high-temperature service with exceptional creep and rupture strength. It is a controlled chemistry version of UNS N08800 (Alloy 800), with tighter limits on carbon (0.06-0.10%), aluminum (0.15-0.60%), and titanium (0.15-0.60%) to optimize high-temperature performance.

The alloy maintains an austenitic structure and offers excellent oxidation and carburization resistance, as well as good corrosion resistance in high-temperature environments. UNS N08811 is particularly valued for its high creep-rupture strength at temperatures above 650°C (1200°F), making it the preferred choice for petrochemical furnaces, ethylene cracking tubes, and power generation equipment.

Specifications & Dimensions
Parameter Details
Standard ASTM B407 (Seamless Tube), ASTM B408 (Bar), ASTM B409 (Plate/Sheet), ASME SB407
Grade / UNS UNS N08811
Type Seamless tube / Welded tube (ERW / EFW)
Outer Diameter 6.0 mm – 610 mm (1/8″ – 24″)
Wall Thickness 0.5 mm – 50 mm (SCH 5S – XXS)
Length 6 m / 9 m / 12 m, or random lengths
Process Cold drawn / Cold rolled (seamless); Plate rolled (welded)
Finish Annealed & pickled / Bright annealed / Solution annealed
Ends Plain end / Beveled end / Threaded
Packaging Hexagonal bundles + plastic end caps + seaworthy wooden crates or pallets
Chemical Composition

The chemical composition of Incoloy 800HT complies with ASTM B408, B409, and B407 standards. Compared to Alloy 800 and 800H, Alloy 800HT features tighter ranges and higher minimums for aluminum and titanium.

Element Content (%) Notes
Nickel (Ni) 30.0 – 35.0 Provides austenitic stability and corrosion resistance
Chromium (Cr) 19.0 – 23.0 Enhances oxidation and carburization resistance
Iron (Fe) ≥ 39.5 (balance) Base element, balances cost and properties
Carbon (C) 0.06 – 0.10 Tightly controlled range for maximum creep strength
Manganese (Mn) ≤ 1.50 Aids in hot workability
Silicon (Si) ≤ 1.00 Improves oxidation resistance
Phosphorus (P) ≤ 0.045 Minimized to maintain ductility
Sulfur (S) ≤ 0.015 Controlled for hot workability
Aluminum (Al) 0.25 – 0.60 Higher minimum than 800H for stability
Titanium (Ti) 0.25 – 0.60 Higher minimum than 800H for stability
Aluminum + Titanium 0.85 – 1.20 Key differentiator – enhanced stabilization
Copper (Cu) ≤ 0.75 Residual element
ASTM Grain Size 5 or coarser Ensures high-temperature stability

We have the actual mill test certificates (EN 10204 3.1) available per batch.

Comparison of 800 Series Grades:

Element 800 (N08800) 800H (N08810) 800HT (N08811)
Carbon (C) ≤ 0.10% 0.05 – 0.10% 0.06 – 0.10%
Aluminum (Al) 0.15 – 0.60% 0.15 – 0.60% 0.25 – 0.60% ↑
Titanium (Ti) 0.15 – 0.60% 0.15 – 0.60% 0.25 – 0.60% ↑
Al + Ti 0.30 – 1.20% 0.30 – 1.20% 0.85 – 1.20% ↑↑
Grain Size Not specified 5 or coarser 5 or coarser
Creep Strength Standard Enhanced Highest
Mechanical Properties

Room Temperature Properties (Solution Heat Treated / Annealed)

Property Metric (MPa) Imperial (ksi)
Tensile Strength (Rm) 550 – 750 80 – 109
Yield Strength 0.2% Proof (Rp0.2) 240 – 310 35 – 45
Elongation (A) ≥ 45% ≥ 45%
Hardness (HB) 140 – 190 140 – 190
Density 7.94 g/cm³ 0.287 lb/in³
Melting Point 1350 – 1400°C 2460 – 2550°F
Modulus of Elasticity 196 GPa 28.4 x 10³ ksi

Operating Temperature Ranges:

Grade Temperature Range Notes
Incoloy 800 Up to ~816°C (1500°F) Standard grade
Incoloy 800H 593°C – 982°C (1100°F – 1800°F) Enhanced creep resistance
Incoloy 800HT 593°C – 982°C (1100°F – 1800°F) Highest creep rupture strength

Typical Rod & Bar Properties:

  • 0.2% Yield Strength: 30 – 60 ksi (205 – 415 MPa)

  • Tensile Strength: 75 – 100 ksi (515 – 690 MPa)

  • Elongation: 60 – 30%

Product Forms & Applicable Standards
Product Form ASTM ASME BS EN/DIN
Rod & Bar B408 SB408 BS 3076NA15 DIN 17460, EN 10095
Wire — — BS 3075NA15 —
Plate & Sheet B409, B906 SB409, SB906 BS 3072NA15 DIN 17460, EN 10028-7, EN 10095
Strip — — BS 3073NA15 —
Seamless Tube B163, B407 SB163, SB407 BS 3074NA15 DIN 17459
Welded Tube B515 SB515 — —
Seamless Pipe B407, B829 SB407, SB829 — —
Welded Pipe B514, B775 SB514, SB775 — —
Forgings B564 SB564 — —
Fittings B366 SB366 — —

ASME Code Cases: Case 1325 (All Product Forms), Case 1983 (Seamless Pipe & Tubes)

Application Areas

Incoloy 800HT is widely used in the following high-temperature applications:

  • Petrochemical Industry: Ammonia reformers, ethylene pyrolysis tubes, cracking furnace components, heat exchangers

  • Industrial Heating: Radiant tubes, furnace muffles, carburizing fixtures, retorts, thermowells

  • Power Generation: Superheater components, steam generator parts, nuclear reactor components

  • Aerospace: Gas turbine engine components, combustion chamber parts, exhaust systems

  • Oil & Gas: Downhole tubing, high-temperature wellhead equipment, gas turbine components

  • Other Applications: Pressure vessels, thermal processing equipment, high-temperature springs, and fasteners

Contact Us

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