Table of Contents
- Incoloy 825 Washers Overview
- Incoloy 825 Washers Specifications
- Technical Properties & Chemical Composition
- Why Industries Prefer Incoloy 825 Washers
- Types of Incoloy 825 Washers
- Key Technical Advantages
- Key Applications of Incoloy 825 Washers
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Incoloy 825 Washers Suppliers & Exporters
If your chemical, offshore, or process piping joints face aggressive corrosion or premature bolt tension loss, you've reached the right source. As a leading Incoloy 825 Washers Supplier and Incoloy 825 Washers Exporter, Aurum Overseas supplies precision-machined Plain, Spring, Lock, Square, and Conical washers in ASME B18.21.1, DIN 125, and ISO 7089 configurations.
Our UNS N08825 Washers feature a specialized nickel-chromium-molybdenum-copper matrix built to withstand combined reducing and oxidizing acids. Complete with full MTR certifications, we also stock high-strength ASTM A194 Grade 8M Washers and ASTM A194 Gr 8M Class 2 Washers across all washer profiles for rapid worldwide shipment.
Incoloy 825 Washers Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grade | Incoloy 825 |
| UNS Designation | UNS N08825 |
| Werkstoff Number | 2.4858 |
| Manufacturing Standards | ASTM B425, ASME SB425, 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 | Solution Annealed / Stabilized Heat Treated |
| Hardness Limit | ≤ 200 HB / ≤ 90 HRB |
| Surface Finishes | Bright Machined, Passivated, Pickled, Descaled |
| Certification | EN 10204 3.1 MTR, PMI Verification, Intergranular Corrosion Testing |
Technical Properties & Chemical Composition
Chemical Composition of UNS N08825 Washers (%)
| Element / Parameter | Incoloy 825 (UNS N08825) (%) |
|---|---|
| Carbon (C) | ≤ 0.05 |
| Nickel (Ni) | 38.00 – 46.00 |
| Chromium (Cr) | 19.50 – 23.50 |
| Iron (Fe) | ≥ 22.00 |
| Copper (Cu) | 1.50 – 3.00 |
| Molybdenum (Mo) | 2.50 – 3.50 |
| Titanium (Ti) | 0.60 – 1.20 |
| Aluminum (Al) | ≤ 0.20 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 0.50 |
| Sulfur (S) | ≤ 0.03 |
Mechanical & Physical Properties of UNS N08825 Washers
| Property | Metric Value | Imperial Value |
|---|---|---|
| Ultimate Tensile Strength | ≥ 550 MPa | ≥ 80,000 psi |
| Yield Strength (0.2% Offset) | ≥ 220 MPa | ≥ 32,000 psi |
| Elongation (%) | ≥ 30% | ≥ 30% |
| Density | 8.14 g/cm³ | 0.294 lb/in³ |
| Melting Point | 1400°C | 2550°F |
Equivalent Grades Comparison
| Standard | Incoloy 825 Equivalent |
|---|---|
| WERKSTOFF NR. | 2.4858 |
| UNS | N08825 |
| JIS | NCF 825 |
| EN | NiCr21Mo |
Why Industries Prefer Incoloy 825 Washers
Sulfuric & Phosphoric Acid Defense: Copper additions (1.50–3.00%) significantly improve resistance to reducing acids, particularly sulfuric and phosphoric acid solutions.
Chloride Stress Corrosion Resistance: High nickel matrix (38.00–46.00%) renders the hardware virtually immune to chloride-induced stress corrosion cracking.
Pitting and Crevice Resistance: Molybdenum (2.50–3.50%) and chromium (19.50–23.50%) work synergistically to prevent localized crevice attack under clamped washer faces.
Intergranular Corrosion Immunity: Titanium addition (0.60–1.20%) stabilizes the structure against chromium carbide precipitation during welding or thermal exposure.
Pitting Resistance Equivalent: High PREN rating ensures longevity in stagnant sea water and marine oilfield splash zones.
Types of Incoloy 825 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 825 Plain Washers
Incoloy 825 Spring Washers
Incoloy 825 Lock Washers
Incoloy 825 Square Washers
Incoloy 825 Conical Washers
Key Technical Advantages
Copper-Enhanced Matrix
Copper content provides specialized protection in environments containing hot sulfuric acid streams.
Stable Microstructure
Resistant to sensitization during high-temperature fabrication, maintaining joint integrity in aggressive chemical service.
High Thermal Stability
Retains mechanical load capacity and dimensional stability across severe thermal cycles.
Non-Galling Clamping
Smooth surface finish prevents thread galling and joint relaxation during heavy torque tightening.
Key Applications of Incoloy 825 Washers
| Industry Sector | Application | Operating Environment |
|---|---|---|
| Chemical Processing | Sulfuric acid pickling tanks, evaporators, and reaction vessel bolting | Severe reducing and oxidizing acid mixtures with high chloride content |
| Oil & Gas (Offshore) | Subsea wellhead equipment, sour gas (H2S) piping, and valve bonnet joints | High-pressure sour gas, marine saltwater splash, and crevice-inducing fluids |
| Nuclear Fuel Reprocessing | Dissolver tanks, fuel element dissolvers, and radioactive liquor lines | Hot nitric acid solutions requiring total intergranular corrosion immunity |
| Pollution Control | Flue gas desulfurization (FGD) scrubbers and ductwork fasteners | Condensing acidic liquors, sulfur dioxide gas, and abrasive slurries |
Quality Testing & Inspection
As an established Incoloy 825 Washers Supplier, Aurum Overseas enforces rigorous quality assurance across every manufacturing batch:
- Chemical PMI Verification: Spectrometric analysis verifies precise elemental limits (Ni: 38–46%, Cr: 19.5–23.5%, Cu: 1.5–3.0%).
- Corrosion Resistance Testing: Intergranular corrosion testing per ASTM G28 ensures full stabilization against carbide precipitation.
- Mechanical Testing: Tensile and yield tests verify compliance with minimum 550 MPa tensile and 220 MPa yield parameters.
- Dimensional Accuracy: Optical micrometer checks ensure exact compliance with ASME B18.21.1 and DIN standards.
Global Export Markets
As a leading Incoloy 825 Washers Exporter, Aurum Overseas supplies fully certified UNS N08825 Washers to international projects across:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Incoloy 825 contains copper (1.5–3.0%) and nickel (38–46%), giving it superior resistance to reducing acids like sulfuric acid compared to conventional stainless steels.
While ASTM A194 Grade 8M washers use 316 stainless steel for general corrosion resistance, UNS N08825 Washers offer far superior protection against severe acid attack, chloride pitting, and stress corrosion cracking.
No. Class 2 washers are strain-hardened 316 stainless fasteners designed for higher strength, whereas Incoloy 825 is selected for extreme chemical corrosion resistance.
As an experienced Incoloy 825 Washers Exporter, we supply EN 10204 3.1 Material Test Reports covering chemical analysis, mechanical testing, and heat traceability.
Contact Aurum Overseas
Aurum Overseas provides rapid delivery of certified Incoloy 825 Washers for global industrial projects.
Contact our technical sales team for instant quotes, material certification, and delivery timelines.