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Quality UNS N08811 Incoloy 800HT Pipe Seamless Nickel Iron Chromium Superalloy factory
Quality UNS N08811 Incoloy 800HT Pipe Seamless Nickel Iron Chromium Superalloy factory

UNS N08811 Incoloy 800HT Pipe Seamless Nickel Iron Chromium Superalloy

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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Incoloy 800HT Pipe Seamless

UNS N08811 Incoloy 800HT

Nickel Iron Chromium Superalloy
Product Summary
Incoloy 800HT represents the highest-performance member of the Incoloy 800 series of nickel-iron-chromium superalloys. Specifically engineered for maximum creep and rupture strength at elevated temperatures, Alloy 800HT features a tightly controlled chemistry with enhanced aluminum and titanium ...

Product Details

Highlight:

Incoloy 800HT Pipe Seamless

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UNS N08811 Incoloy 800HT

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Nickel Iron Chromium Superalloy
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

Incoloy 800HT represents the highest-performance member of the Incoloy 800 series of nickel-iron-chromium superalloys. Specifically engineered for maximum creep and rupture strength at elevated temperatures, Alloy 800HT features a tightly controlled chemistry with enhanced aluminum and titanium content combined with a precisely regulated carbon range of 0.06-0.10%.

Compared to both standard Alloy 800 and Alloy 800H, this premium grade offers superior high-temperature stability and mechanical performance. The key differentiator lies in its controlled chemistry: 800HT requires a minimum combined aluminum and titanium content of 0.85% (compared to 0.30% for 800H), along with an ASTM grain size of 5 or coarser. These enhancements provide exceptional resistance to oxidation, carburization, and sulfidation in the demanding service temperature range of 593°C to 982°C (1100°F to 1800°F).

Alloy 800HT is commonly supplied to ASTM B409, ASME SB-409, and ASTM B564 specifications, making it the preferred material for critical components requiring the highest possible creep rupture strength, including furnace components, heat exchangers, radiant tubes, thermowells, and piping systems in petrochemical and power generation industries.

Key advantages:

  • Maximum Creep & Rupture Strength: Highest performance in the 800 series family

  • Enhanced Stabilization: Minimum Al+Ti of 0.85% for superior high-temperature stability

  • Controlled Carbon Content: 0.06-0.10% optimizes creep and rupture properties

  • Oxidation & Carburization Resistance: Excellent performance up to 982°C (1800°F)

  • ASTM Grain Size Control: Minimum grain size of ASTM 5 or coarser ensures stability

  • Superior Fabricability: Excellent weldability and formability using standard techniques

Product Specifications
Parameter Details
Product Name Incoloy 800HT / Alloy 800HT / Incoloy® 800HT
UNS Designation N08811
Werkstoff Numbers 1.4958, 1.4959
EN Designation 1.4958
British Standard BS 3072NA15 (Plate/Sheet), BS 3073NA15 (Strip), BS 3074NA15 (Seamless Tubes), BS 3075NA15 (Wire), BS 3076NA15 (Rod/Bar)
Common Trade Names Nickelvac 800HT, Nickel 800HT, Ferrochronin 800HT, Nicrofer 3220
Product Forms Plate, Sheet, Strip, Rod, Bar, Wire, Seamless Pipe, Welded Pipe, Seamless Tube, Welded Tube, Forgings, Forging Stock
Supply Condition Solution Heat Treated (SHT), Annealed
Available Dimensions Sheet/Plate: 0.3mm – 50mm thickness; Tube: 6mm – 219mm OD (custom available)
Standard Length 2000mm, 2438mm, 3000mm, 6000mm (or as required)
Custom Sizes Available upon request
Surface Finish Annealed, Pickled, Descaled, Bright Annealed
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

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

Looking for a reliable supplier of Incoloy 800HT for your most demanding high-temperature application?

Get a Quick Quote: Send your inquiry or upload a specification sheet. Our technical sales team will respond within 24 hours.

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