Table of Contents
- Incoloy Fasteners Overview
- Incoloy Fasteners Specifications
- What are Incoloy High-Performance Alloy Nuts?
- Incoloy Fasteners Technical Properties & Composition
- Why Industries Prefer Nickel Alloy 800 & 825 Nuts
- Types of Incoloy Fasteners
- Key Advantages of Incoloy High-Performance Alloy Nuts
- Key Applications of Incoloy Fasteners
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Incoloy 800/800H/800HT/825 Nuts Suppliers & Exporters
Aurum Overseas is a trusted Incoloy 800/800H/800HT/825 Nuts Supplier and specialized Incoloy 800/800H/800HT/825 Nuts Exporter, delivering premium iron-nickel-chromium fasteners built for high-thermal and aggressive chemical service.
Manufactured in full compliance with ASTM B408 and ASTM B425 standards, Nickel Alloy 800 Nuts and Nickel Alloy 825 Nuts handle temperatures ranging from sub-zero levels up to 1100°C (2000°F). These heavy-duty alloy nuts provide reliable joint integrity, preventing thread galling and stress cracking under continuous operational loads.
As an established Incoloy 800/800H/800HT/825 Nuts Exporter, Aurum Overseas delivers fully certified bolting solutions across the USA, Germany, UK, UAE, Saudi Arabia, and Qatar.
Incoloy Fasteners Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grades | Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825 |
| UNS Numbers | UNS N08800 (800), UNS N08810 (800H), UNS N08811 (800HT), UNS N08825 (825) |
| Manufacturing Standards | ASTM B408, ASME SB408, ASTM B425, ASME SB425, DIN 934, ISO 4032 |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Sizes Available |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF) & B1.13M 6h-6G Metric |
| Nut Formats | Hex Head, Square, Lock, Eye, Wing, T, Panel, Coupling, Dome Nuts |
| Certifications | EN 10204 3.1 Material Test Certificate, NACE MR0175 / ISO 15156 Compliant |
What are Incoloy High-Performance Alloy Nuts?
Incoloy 800, 800H, 800HT, and 825 nuts are iron-nickel-chromium alloy fasteners optimized for high-temperature strength and aggressive acid environment protection.
- Incoloy 800 / 800H / 800HT Series: Designed primarily for elevated temperature exposure. Grade 800 offers general high-temperature strength, while 800H (controlled carbon) and 800HT (controlled titanium/aluminum ratio) are solution-annealed to provide maximum creep rupture strength above 600°C (1100°F).
- Incoloy 825 Series: Modified with molybdenum (2.5–3.5%), copper (1.5–3.0%), and titanium for superior resistance to reducing acids, sulfuric acid environments, and localized pitting attack.
Incoloy Fasteners Technical Properties & Composition
Chemical Composition of Incoloy Fasteners (%)
| Element | Incoloy 800 | Incoloy 800H | Incoloy 800HT | Incoloy 825 |
|---|---|---|---|---|
| Nickel (Ni) | 30.00 - 35.00 | 30.00 - 35.00 | 30.00 - 35.00 | 38.00 - 46.00 |
| Iron (Fe) | 39.50 min | 39.50 min | 39.50 min | 22.00 min |
| Chromium (Cr) | 19.00 - 23.00 | 19.00 - 23.00 | 19.00 - 23.00 | 19.50 - 23.50 |
| Carbon (C) | 0.10 max | 0.05 - 0.10 | 0.06 - 0.10 | 0.05 max |
| Manganese (Mn) | 1.50 max | 1.50 max | 1.50 max | 1.00 max |
| Silicon (Si) | 1.00 max | 1.00 max | 1.00 max | 0.50 max |
| Sulfur (S) | 0.015 max | 0.015 max | 0.015 max | 0.03 max |
| Copper (Cu) | 0.75 max | 0.75 max | 0.75 max | 1.50 - 3.00 |
| Aluminum (Al) | 0.15 - 0.60 | 0.15 - 0.60 | 0.15 - 0.60 | 0.02 max |
| Titanium (Ti) | 0.15 - 0.60 | 0.15 - 0.60 | 0.15 - 0.60 | 0.06 - 1.20 |
| Molybdenum (Mo) | - | - | - | 2.50 - 3.50 |
Mechanical & Physical Properties
| Property / Parameter | Incoloy 800 / 800H / 800HT | Incoloy 825 |
|---|---|---|
| Density | 7.94 g/cm³ | 8.14 g/cm³ |
| Melting Point | 1385°C (2525°F) | 1400°C (2550°F) |
| Tensile Strength | 520 MPa (75,000 psi) min | 550 MPa (80,000 psi) min |
| Yield Strength (0.2% Offset) | 205 MPa (30,000 psi) min | 220 MPa (32,000 psi) min |
| Elongation (% in 50mm) | 30% min | 30% min |
Equivalent Grade Standards
| Grade | Werkstoff Nr. | UNS | EN |
|---|---|---|---|
| Incoloy 800 | 1.4876 | N08800 | X10NiCrAlTi32-20 |
| Incoloy 800H | 1.4958 / 1.4876 | N08810 | X5NiCrAlTi31-20 |
| Incoloy 800HT | 1.4859 / 1.4876 | N08811 | X8NiCrAlTi32-21 |
| Incoloy 825 | 2.4858 | N08825 | NiCr21Mo |
Why Industries Prefer Nickel Alloy 800 & 825 Nuts
Engineers specify Nickel Alloy 800 Nuts for heat-treating equipment and petrochemical reformers because the balanced nickel-iron-chromium formulation resists carburization, nitriding, and high-temperature oxidation.
Conversely, Nickel Alloy 825 Nuts are specified in chemical processing and offshore applications due to added copper and molybdenum, which provide resistance to sulfuric acid, phosphoric acid, and chloride stress-corrosion cracking. As a global Incoloy 800/800H/800HT/825 Nuts Supplier, Aurum Overseas delivers precise threaded components tailored for extreme structural performance.
Types of Incoloy Fasteners
Aurum Overseas supplies a comprehensive range of nickel alloy nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Incoloy Hex Head Nuts
Incoloy Square Nuts
Incoloy Lock Nuts
Incoloy Eye Nuts
Incoloy Wing Nuts
Incoloy T Nuts
Incoloy Panel Nuts
Incoloy Coupling Nuts
Incoloy Dome Nuts
Key Advantages of Incoloy High-Performance Alloy Nuts
Creep Rupture Strength (800H/800HT)
Controlled chemistry and solution annealing optimize long-term mechanical stability above 600°C.
Sulfuric & Phosphoric Acid Protection (825)
Copper additions ensure structural stability in reducing chemical process streams.
Carburization Resistance (800 Series)
High nickel and chromium levels form a protective scale that resists carbon absorption in furnace gases.
Chloride Stress Cracking Immunity
Minimum 30% nickel content prevents stress-corrosion cracking in hot chloride solutions.
Good Fabricability & Thermal Ductility
Maintains ductility during rapid thermal cycling without thermal embrittlement.
Key Applications of Incoloy Fasteners
| Industry Sector | Recommended Grade | Primary Fastener Application |
|---|---|---|
| Petrochemical Processing | Incoloy 800H / 800HT | Ethylene pyrolyzer pigtails, reformer furnace headers, and catalyst supports |
| Chemical Manufacturing | Incoloy 825 | Sulfuric acid heating coils, vessel flanges, and pickling tank hardware |
| Thermal Power Generation | Incoloy 800 | Superheater tubing support clamps and steam generator bolting |
| Offshore Oil & Gas | Incoloy 825 | Subsea piping flanges, gas scrubbers, and offshore platform fasteners |
| Nuclear Systems | Incoloy 800 | High-temperature steam generator components and nuclear heat exchangers |
Quality Testing & Inspection
Aurum Overseas maintains stringent quality standards for all orders fulfilled as an Incoloy 800/800H/800HT/825 Nuts Supplier and Incoloy 800/800H/800HT/825 Nuts Exporter.
| Test / Inspection Standard | Technical Verification Scope |
|---|---|
| Positive Material Identification (PMI) | XRF testing verifying Ni, Cr, Fe, Mo, Cu, and Ti composition |
| High-Temperature Tensile Testing | Yield offset and creep strength checking per ASTM E21 standards |
| Corrosion Testing (Grade 825) | Intergranular corrosion testing per ASTM G28 standards |
| Dimensional Inspection | Pitch diameter, thread fit (2B/3B, 6h/6G), and height checks per ASME B18.2.2 |
| Certifications | Traceable EN 10204 3.1 Material Test Reports provided with every delivery |
Global Export Markets
As an international Incoloy 800/800H/800HT/825 Nuts Exporter, Aurum Overseas delivers export-ready fasteners to global buyers.
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 standard for use up to 600°C. Incoloy 800H features a controlled carbon range (0.05–0.10%) for higher creep strength. Incoloy 800HT further restricts aluminum and titanium levels (0.85–1.20% combined) to optimize creep rupture properties above 600°C.
Choose Incoloy 825 nuts when the application involves harsh acids (sulfuric, phosphoric, or nitric) or marine corrosion. Grade 825 includes added molybdenum (2.5–3.5%) and copper (1.5–3.0%) specifically tailored for acid immersion and pitting resistance.
Yes, UNS N08825 nuts fully meet NACE MR0175 / ISO 15156 standards for sour gas service in petroleum environments.
Yes, Aurum Overseas regularly exports certified UNS N08800 / UNS N08825 Nuts across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy), and the GCC region (UAE, Saudi Arabia, Qatar, Kuwait).
Yes, every shipment from Aurum Overseas includes complete EN 10204 3.1 Mill Test Certificates detailing heat numbers, chemical composition, and mechanical properties.
Contact Aurum Overseas
Aurum Overseas provides fast quotes, complete mill test certification, and international shipping for high-temperature and corrosion-resistant alloy fasteners.
Contact our technical sales team today for immediate service.