Nickel Alloys Alloy 825 Fasteners Overview
Zeon Exports supplies Nickel Alloy 825 (Incoloy, UNS N08825) fasteners – bolts, nuts and studs – a nickel-iron-chromium alloy with molybdenum, copper and titanium additions for outstanding acid and chloride resistance in bolted joints.
Nickel Alloy 825 (Incoloy) Fasteners secure bolted connections in sulfuric acid, phosphoric acid and chloride-bearing process piping and equipment. Its nickel-iron-chromium base with molybdenum and copper additions gives outstanding resistance to acids, pitting, crevice corrosion and chloride stress corrosion cracking across a wide range of process conditions.
- High nickel content resists chloride-ion stress corrosion cracking
- Tensile ≥586 MPa, yield ≥241 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Nickel Alloys Alloy 825 Fasteners
Nickel Alloy 825 (Incoloy) Fasteners are produced to internationally recognized bolting specifications.
| Field | Detail |
|---|---|
| Material/Grade | Nickel Alloy 825 (Incoloy) |
| UNS | N08825 |
| DIN/Werkstoff Number | 2.4858 |
| Standards | ASTM B425 |
| Form | Bolts, Nuts, Studs |
| Finish | As specified (confirm on order) |
| Heat Treatment | Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 825
Alloy 825 (Incoloy 825) is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|
| N08825 | 2.4858 | Incoloy 825 | ASTM B425 |
Chemical Composition of Alloy 825
Composition per ASTM B425 for UNS N08825; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Iron (Fe), min | 22.0 |
| Chromium (Cr) | 19.5 – 23.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Carbon (C), max | 0.05 |
| Manganese (Mn), max | 1.00 |
| Sulphur (S), max | 0.03 |
| Silicon (Si), max | 0.50 |
| Aluminum (Al), max | 0.20 |
Physical Properties of Nickel Alloy 825 (Incoloy)
Physical properties for Incoloy 825, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | ~8.14 g/cm3 (typical) |
| Melting Range | ~1370 – 1400°C (typical) |
| Magnetic Behaviour | Essentially non-magnetic |
Mechanical Properties of Nickel Alloys Alloy 825 Fasteners
Minimum mechanical properties for annealed UNS N08825 per ASTM B425.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 586 MPa (85 ksi) |
| Yield Strength (0.2% offset) | 241 MPa (35 ksi) |
| Elongation | 30% |
| Condition | Annealed |
Corrosion Resistance of Nickel Alloy 825 (Incoloy)
- Nickel Alloy 825 Fasteners resist both oxidizing and reducing media, a versatile profile among nickel alloys.
- Acid resistance: molybdenum and copper give outstanding resistance to sulfuric and phosphoric acids.
- Chloride SCC resistance: high nickel content resists chloride-ion stress corrosion cracking that limits stainless steels.
- Pitting and crevice resistance: molybdenum contributes strong resistance to localized attack in chloride media.
Heat Resistance of Nickel Alloy 825 (Incoloy)
Nickel Alloy 825 fasteners have good mechanical properties from cryogenic temperatures to moderately high temperatures, but are not normally used above roughly 540°C (1,000°F), where microstructural changes can significantly lower ductility and impact strength. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Nickel Alloys Alloy 825 Fasteners
Beyond corrosion and heat performance, Incoloy 825 fasteners offer these additional properties.
- Good impact strength maintained at cryogenic temperatures
- Good weldability using ERNiFeCr-1 matching filler metal
- Similar to Alloy 800 with improved aqueous corrosion resistance
- Machinable with standard tooling, allowing for work hardening
Benefits of Nickel Alloys Alloy 825 Fasteners
Choosing Incoloy 825 fasteners from Zeon Exports delivers measurable advantages for your project.
- Broad chemical compatibility across acidic and chloride media
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple sizes, threads and finishes to match exact project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
Explore related Nickel Alloy products from Zeon Exports.
Request a Quote for Nickel Alloys Alloy 825 Fasteners
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Call: +91 98205 33105
Email: info@zeonexports.com
Website: www.zeonexports.com
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Frequently Asked Questions About Nickel Alloys Alloy 825 Fasteners
Common questions about Nickel Alloy 825 (Incoloy) Fasteners, answered below.
Q1: What is Nickel Alloy 825 (Incoloy)?
Ans. Incoloy 825 (UNS N08825) is a nickel-iron-chromium alloy with molybdenum, copper and titanium additions for acid resistance.
Q2: Which fastener types are available in Incoloy 825?
Ans. We supply bolts, nuts and studs manufactured to ASTM B425 across standard thread sizes and lengths.
Q3: What standards do Incoloy 825 fasteners meet?
Ans. Fasteners are manufactured to ASTM B425, certified to EN 10204 3.1 mill test certificates.
Q4: What is the maximum service temperature?
Ans. Incoloy 825 is not normally used above roughly 540°C (1,000°F); confirm exact limits against your design code.
Q5: Is Incoloy 825 magnetic?
Ans. Incoloy 825 is essentially non-magnetic, being an austenitic nickel-iron-chromium alloy.
Q6: Is Incoloy 825 suitable for sulfuric acid service?
Ans. Yes, Incoloy 825 is especially resistant to sulfuric and phosphoric acids across a range of concentrations.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom sizes?
Ans. Yes, fasteners are available in custom thread sizes and lengths on request for bulk industrial orders.
