ASTM B163 UNS N08825 Seamless Tube Incoloy 825 Alloy Tubes
High-Performance Nickel Alloy Seamless Tubing
ASTM B163 UNS N08825 seamless tubes, commonly known as Incoloy 825 alloy tubes, are nickel-iron-chromium alloy tubes engineered for heat exchangers, condensers, and corrosion-resistant applications. Alloy 825 offers excellent resistance to sulfuric and phosphoric acids, chloride stress corrosion cracking, and localized corrosion, making it a preferred material for chemical processing, oil & gas, offshore, and pollution control systems.
What Is ASTM B163?
ASTM B163 is the standard specification for seamless nickel and nickel alloy condenser and heat exchanger tubes. It defines requirements for:
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Chemical composition
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Mechanical properties
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Manufacturing method
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Heat treatment condition
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Dimensional tolerances
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Testing and inspection
ASTM B163 ensures the quality and reliability of Incoloy 825 seamless tubing for thermal and corrosive environments.
Material Grade: UNS N08825 (Incoloy® 825)
UNS N08825, also known as Incoloy 825, is a stabilized nickel alloy containing chromium, molybdenum, copper, and titanium. This alloy provides excellent corrosion resistance in both oxidizing and reducing environments.
Key Properties of Incoloy 825 Seamless Tubes
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Outstanding resistance to sulfuric and phosphoric acids
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Excellent resistance to chloride-induced stress corrosion cracking
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Good resistance to pitting and crevice corrosion
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Stable mechanical properties over a wide temperature range
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Excellent weldability and fabrication characteristics
Product Form & Manufacturing
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Product Form: Seamless tube
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Manufacturing Process: Hot finished / cold drawn
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Delivery Condition: Solution annealed
Size Range & Specifications
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Outside Diameter: 6.35 mm – 114.3 mm (1/4″ – 4-1/2″)
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Wall Thickness: 0.5 mm – 9.65 mm
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Length: Random length or fixed length
Chemical Composition – UNS N08825 (Typical, wt %)
| Element | Content |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Chromium (Cr) | 19.5 – 23.5 |
| Iron (Fe) | ≥ 22.0 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.50 |
| Sulfur (S) | ≤ 0.03 |
Mechanical Properties (Room Temperature)
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2%) | ≥ 240 MPa |
| Elongation | ≥ 30% |
Heat Treatment
ASTM B163 Incoloy 825 seamless tubes are supplied in the solution annealed condition, followed by rapid cooling to ensure maximum corrosion resistance and structural stability.
ASTM-B163-UNS-N08825-Seamless-Tubes
Testing & Inspection
ASTM B163 UNS N08825 tubes are tested according to strict quality requirements, including:
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Chemical analysis
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Tensile testing
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Eddy current or hydrostatic testing
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Dimensional inspection
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Surface inspection
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Certification: EN 10204 3.1 / 3.2 (upon request)
Applications of Incoloy 825 Alloy Tubes
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Heat exchangers and condensers
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Chemical and petrochemical processing plants
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Oil & gas production and refining
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Offshore and marine systems
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Acid pickling and handling equipment
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Pollution control and FGD systems
ASTM B163 vs ASTM B423 Incoloy 825 Tubes
| Item | ASTM B163 | ASTM B423 |
|---|---|---|
| Product Type | Heat exchanger tube | Pipe & tube |
| Seamless | Yes | Yes |
| Typical Use | Thermal systems | General corrosion service |
ASTM B163 UNS N08825 Incoloy 825 seamless tubes provide exceptional corrosion resistance, thermal stability, and long-term reliability in heat exchanger and condenser applications. Fully compliant with ASTM B163, Incoloy 825 alloy tubing is a proven solution for chemical, offshore, and acid service environments.
