Table of Contents
- Incoloy 800 / 800H / 800HT Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of UNS N08800 / UNS N08810 / UNS N08811 Hex Bars
- Key Advantages of Incoloy 800 / 800H / 800HT Hex Bar
- Key Applications of Incoloy 800 / 800H / 800HT Hex Bar
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Incoloy 800 / 800H / 800HT Overview
Aurum Overseas is a premier Incoloy 800 / 800H / 800HT Hex Bars Supplier offering iron-nickel-chromium bars for high temperatures. Our UNS N08800 / UNS N08810 / UNS N08811 Hex Bars utilize a balanced 30–35% nickel and 19–23% chromium chemistry to resist oxidation up to 1100 °C.
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As a trusted Incoloy 800 / 800H / 800HT Hex Bars Exporter, we supply precision Incoloy 800 Bright Hex Bars for fastener machining and heavy Incoloy 800 Forged Hex Bars for load-bearing fittings. Every order features solution-annealed options, EN 10204 3.1 mill test certificates, and custom cut-to-length sawing.
We deliver certified nickel-iron-chromium hex bar stock to petrochemical, nuclear, heat-treating, and synthetic processing facilities across the USA, Germany, UK, UAE, Saudi Arabia, and global markets.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B408, ASME SB408, EN 10088-3, ISO 9723 |
| UNS Designation | UNS N08800 (800) / UNS N08810 (800H) / UNS N08811 (800HT) |
| Across-Flats (AF) Size Range | 6.0 mm to 100.0 mm (1/4" to 4" Hexagon) |
| Length Options | 1,000 mm to 6,000 mm, Precision Sawing Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged, Rough Machined |
| Condition | Annealed (Grade 800), Solution Annealed (Grades 800H & 800HT) |
| Dimensional Tolerances | ASTM B408 / ISO 286-2 (h9, h10, h11 hex profile tolerances) |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Standard / Grade | Werkstoff Nr. | UNS Designation | JIS | EN Symbol |
|---|---|---|---|---|
| Incoloy 800 | 1.4876 | N08800 | NCF 800 | X10NiCrAlTi32-20 |
| Incoloy 800H | 1.4958 | N08810 | NCF 800H | X5NiCrAlTi31-20 |
| Incoloy 800HT | 1.4859 | N08811 | NCF 800HT | X8NiCrAlTi32-21 |
Chemical Composition (%)
| Element | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Carbon (C) | 0.10 max | 0.05 – 0.10 | 0.06 – 0.10 |
| 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 |
| Iron (Fe) | 39.50 min | 39.50 min | 39.50 min |
| 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 |
| Aluminum (Al) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 (Al+Ti: 0.85–1.20) |
| Titanium (Ti) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 (Al+Ti: 0.85–1.20) |
Mechanical & Physical Properties
| Property Parameter | Alloy 800 / 800H / 800HT Metric (Imperial) |
|---|---|
| Density | 7.94 g/cm³ (0.287 lb/in³) |
| 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 % |
Types of UNS N08800 / UNS N08810 / UNS N08811 Hex Bars
Aurum Overseas supplies Incoloy 800 / 800H / 800HT hex bars in precision bright and heavy forged conditions for high-temperature industrial applications.
Incoloy 800 / 800H / 800HT Bright Hex Bars
Incoloy 800 / 800H / 800HT Forged Hex Bars
Key Advantages of Incoloy 800 / 800H / 800HT Hex Bar
High-Temperature Creep Resistance
Solution-annealed coarse grain structures in 800H and 800HT provide long-term load bearing capability above 600 °C.
Carburization and Oxidation Barrier
High nickel and chromium chemistry protects against internal carbon absorption and oxide scaling in thermal cracking furnaces.
Sigma Phase Stability
Resists brittle phase formation during prolonged thermal exposure between 540 °C and 870 °C.
Precision Machining Profile
Uniform across-flats dimensions allow seamless production of high-temperature hex fasteners, fittings, and couplings.
Key Applications of Incoloy 800 Series Hex Bar
| Industry | Applications | Key Grade & Benefit |
|---|---|---|
| Petrochemical Processing | Hydrocarbon cracking furnace pigtails, header hex plugs, thermal studs | Incoloy 800HT: High combined Al+Ti delivers maximum creep resistance at extreme temperatures. |
| Industrial Heat Treating | Retort support pins, radiant tube hex couplings, furnace basket tie rods | Incoloy 800H: Coarse grain solution-annealed structure resists thermal deformation. |
| Power Generation | Superheater structural support pins, steam generator tubing components | Incoloy 800: Excellent resistance to steam oxidation and aqueous stress corrosion. |
| Chemical Synthetic Plants | Nitric acid reheater components, ammonia effluent cooler hex fittings | Incoloy 800: Superior resistance to nitric acid oxidation and high-pressure steam environments. |
Quality Assurance & Inspection
As a leading Incoloy 800 / 800H / 800HT Hex Bars Exporter, every dispatch undergoes strict non-destructive and destructive testing to meet global engineering standards:
- Spectro Chemical Analysis: Positive Material Identification (PMI) verifying precise Ni, Cr, Fe, C, Al, and Ti balance.
- Grain Size Verification: Metallographic examination per ASTM E112 to confirm ASTM 5 or coarser grain size for 800H and 800HT.
- Mechanical Testing: Ambient and elevated-temperature tensile, yield, and elongation testing according to ASTM B408.
Global Export Markets
As an established Incoloy 800 / 800H / 800HT Hex Bars Exporter, Aurum Overseas supplies fully certified UNS N08800 / UNS N08810 / UNS N08811 Hex Bars to global petrochemical and thermal processing centers:
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 with fine grains. 800H is solution-annealed with controlled carbon (0.05–0.10%) and coarse grains for creep strength. 800HT adds restricted Al+Ti (0.85–1.20%) for maximum high-temperature creep performance.
Hex bars provide parallel flat surfaces for easy wrench engagement and efficient thread cutting, making them ideal for high-temperature bolts, structural pins, and fluid fittings.
Incoloy 800 series hex bars are manufactured in strict compliance with ASTM B408 and ASME SB408 standards.
Yes, its 30–35% nickel content forms a protective barrier against carbon absorption and carburization in high-temperature gas processing.
Shipments include EN 10204 3.1 Mill Test Certificates detailing heat numbers, chemical composition, grain size, and mechanical test results.
Contact Aurum Overseas
Partner with a trusted Incoloy 800 / 800H / 800HT Hex Bars Supplier and Exporter for certified stock, custom sawing, and reliable global delivery.