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Incoloy 800/800H/800HT Threaded Bars Overview
Aurum Overseas is a trusted Incoloy 800 & 800H/800HT Threaded Bars Supplier & Exporter, offering heat-resistant nickel-iron-chromium fasteners made to ASTM B408 and ASME SB408 standards. Our ready stock of Incoloy 800, 800H & 800HT Threaded Rods holds strong and resists rust or damage even under long periods of intense heat.
-threaded-bar.webp "Incoloy 800HT High Temperature Threaded Bars and Studs")
For stronger performance under constant high heat, we stock heat-treated UNS N08800, N08810 & N08811 Threaded Bars with controlled titanium and aluminum levels. These durable Alloy 800, 800H & 800HT Threaded Bars stop metal weakening and cracking during continuous use up to 1100 °C (2000 °F).
Built for petrochemical cracking furnaces, power plant reheaters, and heat-treat equipment, our full-thread studs keep joints tight and secure. Contact Aurum Overseas for quick factory quotes, custom length cutting, and fast global shipping.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B408, ASME SB408, EN 10204 3.1, ISO 9723 |
| UNS Designations | UNS N08800 (800) / UNS N08810 (800H) / UNS N08811 (800HT) |
| Thread Size Range | M6 to M100 (1/4" to 4.0" Nominal Diameter) |
| Thread Profiles | UNC, UNF, UNEF, Metric Coarse, Metric Fine, Acme Threads |
| Length Options | 1,000 mm, 2,000 mm, 3,000 mm, Custom Cut-to-Length All-Thread Studs |
| Thread Class / Fit | Class 2A / 3A (Imperial) & 6g / 6h (Metric Profile Tolerances) |
| HSN Code | 75089090 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | W.Nr. | UNS | JIS | EN |
|---|---|---|---|---|---|
| Incoloy 800 | ASTM B408 | 1.4876 | N08800 | NCF 800 | X10NiCrAlTi32-20 |
| Incoloy 800H | ASTM B408 | 1.4958 / 1.4876 | N08810 | NCF 800H | X5NiCrAlTi31-20 |
| Incoloy 800HT | ASTM B408 | 1.4859 / 1.4876 | N08811 | NCF 800HT | X8NiCrAlTi32-21 |
Chemical Composition (%)
| Chemical Element | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Nickel (Ni) | 30.00 – 35.00 | 30.00 – 35.00 | 30.00 – 35.00 |
| Chromium (Cr) | 19.00 – 23.00 | 19.00 – 23.00 | 19.00 – 23.00 |
| Iron (Fe) | 39.50 min | 39.50 min | 39.50 min |
| Carbon (C) | 0.10 max | 0.05 – 0.10 | 0.06 – 0.10 |
| Aluminum (Al) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Al + Ti Total | — | — | 0.85 – 1.20 |
| Manganese (Mn) | 1.50 max | 1.50 max | 1.50 max |
| Silicon (Si) | 1.00 max | 1.00 max | 1.00 max |
| Sulfur (S) | 0.015 max | 0.015 max | 0.015 max |
| Copper (Cu) | 0.75 max | 0.75 max | 0.75 max |
Mechanical & Physical Properties
| Property Parameter | Value |
|---|---|
| Density | 7.94 g/cm³ |
| Melting Point | 1385 °C (2525 °F) |
| Tensile Strength (Min) | 520 MPa (75,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 205 MPa (30,000 Psi) |
| Elongation (Min) | 30 % |
Incoloy 800 vs 800H vs 800HT
| Technical Feature | Incoloy 800 (UNS N08800) | Incoloy 800H (UNS N08810) | Incoloy 800HT (UNS N08811) |
|---|---|---|---|
| Max Temperature | Up to 590 °C (1100 °F) | Up to 980 °C (1800 °F) | Up to 1100 °C (2000 °F) |
| Creep & Rupture Strength | Standard structural load rating | Solution annealed for high creep resistance | Controlled Al+Ti (0.85–1.20%) for maximum creep life |
| Primary Industrial Use | Industrial furnace structural bolts & piping | Hydrocarbon cracking tubes & steam superheaters | High-stress ethylene cracking pigtails & reformers |
| Commercial Buyer Choice | Best cost-efficiency for mid-temp thermal lines | Mandatory choice for cyclic high-stress heating | Premium spec required for severe creep-critical units |
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Key Advantages
High-Temperature Carburization Resistance
Balanced Nickel and Chromium prevent carbon absorption and scaling in hot furnace gases.
Superior Creep-Rupture Strength
Controlled chemistry in 800H/800HT stops thread deformation and stretching under constant thermal strain.
Atmospheric Stability
Resists nitriding, oxidation, and sulfur damage in harsh high-heat processing environments.
Heavy Thread Load Capacity
Roll-threaded construction protects pitch accuracy and prevents thread stripping under extreme joint expansion.
Quality Testing & Inspection
Aurum Overseas subjects every order to strict quality control processes to ensure compliance with international fastener standards and client specifications:
- Chemical Heat Verification (PMI): Spectro / XRF material analysis verifying exact elemental chemistry against ASTM standards.
- Thread Pitch & Gage Inspection: Go/No-Go thread gage and optical comparator testing ensuring class 2A/3A and 6g pitch tolerances.
- Mechanical Property Certification: Factory batch verification of tensile, yield strength, and elongation supported by EN 10204 3.1 MTRs.
- Optional Third-Party Testing: Ultrasonic (UT), Dye Penetrant (DPI), or Proof Load testing provided upon client project request.
Global Export Markets
As an established Incoloy 800/800H/800HT Threaded Bars Exporter, Aurum Overseas supplies fully certified ASTM B408 UNS N08800, N08810 and N08811 threaded rods to global chemical processing, nuclear, furnace, and high-temperature industrial facilities:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
Incoloy 800 is mill-annealed for service up to 590 °C. Grade 800H controls carbon content (0.05–0.10%) and grain size, while 800HT adds a restricted combined Aluminum and Titanium limit (0.85–1.20%) for maximum creep strength above 600 °C.
Yes. Incoloy 800HT is specifically designed for high-temperature power plant steam superheaters and reheaters due to its superior creep and stress-rupture properties.
There is no physical or technical distinction. Both terms refer to continuously threaded bar stock used for stud bolting, anchoring, and flange clamping.
We offer metric coarse/fine (6g fit) and imperial UNC, UNF, UNEF, and Acme profiles (class 2A/3A) in custom cut lengths.
Contact Aurum Overseas
Contact a dedicated Incoloy 800 Threaded Bars Exporter and Incoloy 800 Threaded Bars Supplier for certified high-temperature alloy threaded rod stock, custom length sawing, and fast international delivery.