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Incoloy® 825 Seamless & Welded Tubing
A titanium-stabilized, austenitic nickel-iron-chromium alloy with molybdenum and copper additions, designed for extreme corrosion resistance in aggressive environments.
- Superior corrosion resistance:Excellent performance in sulfuric/phosphoric acids, seawater, and chloride-containing media.
- High-temperature stability:Maintains mechanical properties up to 550°C (1022°F).
- Stress corrosion cracking (SCC) resistance:High nickel content (38–46%) mitigates chloride-induced SCC.
- Weldability:Compatible with TIG, MIG, and plasma arc welding; post-weld heat treatment not typically required.
Chemical Composition (wt%)
Element | Composition (wt%) | Role |
Nickel (Ni) | 38.0–46.0 | Base matrix, enhances ductility and SCC resistance |
Chromium (Cr) | 19.5–23.5 | Forms passive oxide layer for oxidation resistance |
Iron (Fe) | ≥22.0 (balance) | Cost-effective base element |
Molybdenum (Mo) | 2.5–3.5 | Improves pitting/crevice corrosion resistance |
Copper (Cu) | 1.5–3.0 | Enhances sulfuric/phosphoric acid resistance |
Titanium (Ti) | 0.6–1.2 | Stabilizes against sensitization during welding |
Carbon (C) | ≤0.025 | Minimizes carbide precipitation |
Manganese (Mn) | ≤1.0 | Deoxidizer, improves hot workability |
Silicon (Si) | ≤0.5 | Controls fluidity during casting |
Sulfur (S) | ≤0.03 | Reduces hot cracking risk |
Surface Treatment
- Pickling & Passivation:Removes oxide layers and restores corrosion resistance.
- Polishing:Optional Ra ≤0.8μm for high-purity applications (e.g., pharmaceutical).
- Mill Finish:Standard as-rolled/as-drawn surface (ASTM B423).
Why Choose Us ?
- Certified Quality:ASTM B423/B704 compliant, with EN 10204 3.1/3.2 certifications.
- Custom Solutions:OD 6–500mm, wall thickness 1–30mm, lengths up to 12m.
- Testing Assurance:100% UT/ET, hydrostatic testing, PMI, and intergranular corrosion tests per ASTM G28.
Applications & Industries
Aerospace:
High-power density actuators.
Electronics:
Precision sensors & MEMS components.
Energy:
Magnetic coupling devices for turbines.
Frequently Asked Questions
Q1: Can Incoloy 825 tubing withstand hydrofluoric acid?
A: No—avoid HF exposure; use Hastelloy C-2000 instead.
Q2: Is post-weld heat treatment needed?
A: Generally no, but stress relief at 900°C (1652°F) may be required for thick sections.
Q3: Lead time for custom sizes?
A: 4–6 weeks for non-stock dimensions.
Q4: How does Incoloy 825 compare to other nickel alloys?
A: Unlike Inconel 825 (similar corrosion resistance), Incoloy 825 offers better cost-performance balance for moderate-temperature applications.
Q5: How to prevent intergranular corrosion?
A: Use low-carbon filler materials, control heat input, and avoid prolonged exposure in the sensitization temperature range (typically 425–815°C).
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