Table of Contents
- Incoloy 800/800H/800HT Washers Overview
- Incoloy 800/800H/800HT Washers Specifications
- Technical Properties & Chemical Composition
- Granular Grade Distinction: 800 vs 800H vs 800HT
- Why Industries Prefer Incoloy 800/800H/800HT Washers
- Types of Incoloy 800/800H/800HT Washers
- Key Technical Advantages
- Key Applications of Incoloy 800/800H/800HT Washers
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Incoloy 800/800H/800HT Washers Suppliers & Exporters
Aurum Overseas is a leading Incoloy 800/800H/800HT Washers Supplier and Exporter, stocking Plain, Spring, Lock, Square, and Conical styles to ASME B18.21.1, DIN 125, and ISO 7089 standards.
Formulated with 30–35% nickel, 19–23% chromium, and ≥39.50% iron, these UNS N08800 / N08810 / N08811 Washers resist continuous high-temperature oxidation, carburization, and thermal degradation. We maintain fully certified, solution-annealed stock ready for immediate global dispatch to power generation and petrochemical projects.
Incoloy 800/800H/800HT Washers Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grades | Incoloy 800, Incoloy 800H, Incoloy 800HT |
| UNS Designations | UNS N08800, UNS N08810, UNS N08811 |
| Manufacturing Standards | ASTM B408, ASME SB408, ASTM B564, ASME SB564 |
| Dimensional Specifications | ASME B18.21.1, DIN 125 A/B, DIN 127, DIN 9021, ISO 7089, ISO 7090 |
| Washer Types | Plain Washers, Spring Washers, Lock Washers, Square Washers, Conical Washers |
| Size Range | Imperial: #4 to 4" NB | Metric: M3 to M100 |
| Thickness Range | 0.5 mm to 12 mm (Custom gauges available on request) |
| Delivery Condition | Mill Annealed (800) | Solution Annealed (800H / 800HT) |
| Hardness Limit | ≤ 192 HB / ≤ 90 HRB |
| Surface Finishes | Bright Machined, Passivated, Pickled, Descaled |
| Certification | EN 10204 3.1 MTR, PMI Verification, Grain Size Certification |
Technical Properties & Chemical Composition
Chemical Composition of UNS N08800 Washers (%)
| Element / Parameter | 800 (UNS N08800) | 800H (UNS N08810) | 800HT (UNS N08811) |
|---|---|---|---|
| Carbon (C) | ≤ 0.10 | 0.05 – 0.10 | 0.06 – 0.10 |
| 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 |
| Titanium (Ti) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Aluminum + Titanium (Al + Ti) | — | — | 0.85 – 1.20 |
| Iron (Fe) | ≥ 39.50 | ≥ 39.50 | ≥ 39.50 |
| Manganese (Mn) | ≤ 1.50 | ≤ 1.50 | ≤ 1.50 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 |
| Copper (Cu) | ≤ 0.75 | ≤ 0.75 | ≤ 0.75 |
Mechanical Properties of UNS N08800 Washers
| Property | Value |
|---|---|
| Tensile Strength | ≥ 75,000 psi / 520 MPa |
| Yield Strength (0.2% Offset) | ≥ 30,000 psi / 205 MPa |
| Elongation (%) | ≥ 30% |
| Density | 7.94 g/cm³ |
| Melting Point | 1385 deg C (2525 deg F) |
Equivalent Grades Comparison
| Standard | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| WERKSTOFF NR. | 1.4876 | 1.4958 / 1.4876 | 1.4859 / 1.4876 |
| UNS | N08800 | N08810 | N08811 |
| JIS | NCF 800 | NCF 800H | NCF 800HT |
| EN | X10NiCrAlTi32-20 | X5NiCrAlTi31-20 | X8NiCrAlTi32-21 |
Granular Grade Distinction: 800 vs 800H vs 800HT
To ensure optimal hardware performance, choosing the correct grade based on operational temperature and stress mechanics is crucial:
Incoloy 800 (UNS N08800)
Thermal Range: Ambient up to 593°C (1100°F).
Best Use Case: Mill-annealed for general chemical processing, heating element sheathing, and process piping.
Incoloy 800H (UNS N08810)
Thermal Range: Above 593°C (1100°F).
Best Use Case: Solution-annealed with controlled carbon (0.05–0.10%) for high creep-rupture performance in hydrocarbon reformers, furnace bolting, and thermal vessel flanges.
Incoloy 800HT (UNS N08811)
Thermal Range: Continuous high-temp service from 600°C (1112°F) to 982°C (1800°F).
Best Use Case: Enforces restricted Al+Ti (0.85–1.20%) for maximum stress-rupture strength in ethylene cracking furnaces, superheater bolting, and nuclear reactors.
Why Industries Prefer Incoloy 800/800H/800HT Washers
Adherent Oxide Scale Integrity: Chromium (19.00–23.00%) forms a tightly bound, non-spalling surface oxide layer that prevents progressive scaling under cyclic thermal exposure.
Carburization Resistance: High nickel content (30.00–35.00%) inhibits carbon absorption in high-temperature hydrocarbon cracking streams.
Chloride Stress Corrosion Defense: Balanced iron-nickel matrix provides superior protection against chloride-induced stress corrosion cracking compared to standard austenitic stainless steels.
Creep and Rupture Performance: Solution-annealed 800H and 800HT grades maintain high long-term creep-rupture strength under constant joint loading.
Structural Stability: Retains metallurgical ductility and impact toughness over thousands of operating hours without forming embrittling sigma phase precipitates.
Types of Incoloy 800/800H/800HT Washers
Aurum Overseas supplies a comprehensive range of nickel alloy washer configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Incoloy 800 Plain Washers
Incoloy 800 Spring Washers
Incoloy 800 Lock Washers
Incoloy 800 Square Washers
Incoloy 800 Conical Washers
Key Technical Advantages
Optimized Titanium-to-Carbon Ratio
Titanium binding stabilizes carbon to prevent intergranular chromium carbide precipitation along grain boundaries.
Thermal Shock Resistance
Low coefficient of expansion reduces cyclic joint fatigue between washer surfaces and adjacent flanged components.
Nitriding Atmosphere Defense
High nickel-iron matrix resists internal nitridation in ammonia and nitrogen-rich thermal processing gas streams.
Consistent Clamping Load
Resists load relaxation and bolt tension loss in thermal cycling environments.
Key Applications of Incoloy 800/800H/800HT Washers
| Industry Sector | Application | Operating Environment |
|---|---|---|
| Petrochemical & Refining | Ethylene pyrolysis furnace bolting, pigtail piping clamps, and hydrocracker flanges | High thermal carbonization, thermal fatigue, and high-pressure hydrocarbon streams |
| Power Generation | Superheater header fasteners, reheater tube supports, and steam piping joints | Continuous high-temperature steam exposure with severe oxidation risk |
| Thermal Processing | Heat treat furnace muffles, radiant tube supports, and retort bolting | Cyclic thermal ramp-ups, oxidizing gases, and furnace internal stresses |
| Nuclear Engineering | Steam generator tubing hardware and high-temperature gas reactor vessel joints | High-purity primary water and high-temperature helium cooling circuits |
Quality Testing & Inspection
As a leading Incoloy 800/800H/800HT Washers Supplier, Aurum Overseas enforces rigorous quality checks on every order:
- Chemical Verification: Positive Material Identification (PMI) testing ensures exact chemistry (Ni: 30–35%, Cr: 19–23%, Fe: ≥ 39.50%) and confirms specific Al+Ti requirements for 800HT.
- Grain Size Determination: Metallographic analysis certifies ASTM grain size (ASTM 5 or coarser) for 800H and 800HT high-temperature compliance.
- Mechanical Batch Testing: Tensile strength testing verifies minimum 75,000 psi (520 MPa) tensile and 30,000 psi (205 MPa) yield performance.
- Dimensional Precision: Micro-gauge and optical comparator inspection guarantees exact tolerances for inner diameter, outer diameter, and thickness.
Global Export Markets
As a globally recognized Incoloy 800/800H/800HT Washers Exporter, Aurum Overseas supplies fully certified UNS N08800 / N08810 / N08811 Washers to energy and processing projects in:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
They are manufactured in accordance with ASTM B408 / B564 material standards and ASME B18.21.1, DIN 125, or ISO 7089 dimensional specifications.
Incoloy 800 series alloys perform well in oxidizing sulfur environments, but in reducing sulfur gas atmospheres, temperature limits must be evaluated due to potential sulfidation risks.
While primary applications target elevated temperatures, Incoloy 800 series washers maintain good toughness and ductility at cryogenic temperatures without brittle transition.
As an experienced Incoloy 800/800H/800HT Washers Exporter, we supply EN 10204 3.1 Material Test Reports covering chemical analysis, grain size determination, mechanical properties, and heat traceability.
Contact Aurum Overseas
Aurum Overseas provides rapid delivery of certified UNS N08800 / N08810 / N08811 Washers for global industrial projects.
Contact our technical sales team for instant quotes, material certification, and delivery timelines.