Introduction
ASTM B163 Incoloy 825 Seamless Tube (UNS N08825) is a high-performance nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. DLSS supplies seamless tubes in size 25.4 mm OD × 2.11 mm WT × 5555 mm length, manufactured according to ASTM B163 and finished with a bright annealed surface for enhanced smoothness, corrosion resistance, and cleanliness.
Incoloy 825 is renowned for its excellent resistance to corrosive environments, especially sulfuric acid, phosphoric acid, seawater, and chloride-containing media, making it a preferred choice for heat exchangers, condensers, chemical processing, and marine applications.
What is Incoloy 825 (UNS N08825)?
Incoloy 825 is a nickel-iron-chromium alloy with additions of:
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Nickel (38–46%)
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Iron (22% min.)
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Chromium (19.5–23.5%)
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Molybdenum, Copper, and Titanium
Key advantages:
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Excellent resistance to oxidizing and reducing acids
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High resistance to stress-corrosion cracking
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Strong resistance to pitting and crevice corrosion in seawater
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Good mechanical properties at both room and elevated temperatures
Specifications
| Item | Details |
|---|---|
| Standard | ASTM B163 |
| Material | Incoloy 825 (UNS N08825) |
| Type | Seamless Tube |
| Size | 25.4 mm OD × 2.11 mm WT × 5555 mm Length |
| Surface Finish | Bright Annealed |
| Applications | Heat exchangers, condensers, chemical plants, marine & offshore systems |
Key Features
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Bright Annealed Finish – smooth inner surface for improved corrosion resistance and cleanliness.
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Corrosion Resistance – withstands sulfuric acid, phosphoric acid, seawater, and chloride environments.
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High Strength & Durability – reliable performance under high pressure and temperature.
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Stress-Corrosion Resistance – minimizes risk of cracking in harsh chemical media.
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Proven Alloy – widely used in chemical, marine, and oil & gas industries.
Applications
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Heat Exchangers & Condensers – for corrosive chemical and marine service.
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Chemical Processing – sulfuric and phosphoric acid plants.
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Desalination & Seawater Cooling – resistant to chloride attack.
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Oil & Gas Industry – offshore platforms, refineries, and piping systems.
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Power Generation – condensers and high-temperature tube systems.
Why Choose DLSS?
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Reliable supplier of nickel alloy seamless tubes (Incoloy, Inconel, Hastelloy, Monel).
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Strict QC – 100% Eddy Current, Hydrostatic, and PMI testing.
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Third-Party Inspection – SGS, BV, TUV certification available.
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Export Packaging – capped ends, plastic wrapping, seaworthy wooden cases.
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Global Projects – supplied to chemical plants, desalination, and offshore systems.
Frequently Asked Questions (FAQ)
Q1: Why use Incoloy 825 for heat exchangers?
A1: Because it resists a wide range of aggressive media, including acids, seawater, and chlorides, ensuring long-term durability.
Q2: What is the benefit of Bright Annealed tubes?
A2: Bright annealing produces a clean, smooth, and oxide-free surface, reducing corrosion initiation points and improving heat transfer efficiency.
Q3: Can DLSS provide other nickel alloy grades?
A3: Yes, DLSS also supplies Inconel 600/625, Monel 400, Hastelloy C-22/C-276, etc.
Q4: What certifications are provided?
A4: MTC EN 10204/3.1, with optional third-party inspection by SGS, BV, or TUV.
