ASTM B167 Inconel 690 N06690 Seamless Pipe For Steam Generator Heat Transfer
ASTM B167 Inconel 690 pipe
ASTM B167 covers seamless nickel-chromium-iron alloy (Ni-Cr-Fe) pipe for high temperature and corrosive applications.
Inconel 690 is a high chromium nickel-chromium alloy optimized to resist oxidation, carburization, and corrosion in harsh environments.
High chromium content (27-31%): Excellent resistance to oxidizing acids (e.g., nitric acid), chlorides, and high temperature oxidation.
Low thermal expansion: Suitable for thermal cycling applications.
Resistance to stress corrosion cracking (SCC): Excellent in alkaline and acidic environments.
Stability in high temperature water: Widely used in nuclear and power generation systems.
Superior oxidation resistance compared to alloys with lower chromium content (e.g., Inconel 600). Minimal sensitivity to chloride-induced stress
corrosion cracking and intergranular corrosion.
Long-term stability in high temperature water (e.g., nuclear coolant systems).
Inconel 690 Pipes & Tubing Chemical Composition
| Grade | C | Mn | Si | S | Co | Fe | Ni |
| Inconel 690 | ≤ 0.15 | ≤ 1 | ≤ 1 | – | 10-15 | Balance |
48.85 – 62
|
Alloy 690 Pipe and Tubes Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Inconel 690 | 8.3g/cm³ | 1363°C | ≥ 485 MPa | ≥ 275 MPa | 25 % |
Inconel 690 Pipes & Tubes Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS |
| Inconel 690 | 2.4642 | N06690 |
Application
Nuclear Industry: Steam generator tubes, reactor components in pressurized water reactors (PWRs).
Chemical Processing: Heat exchangers, piping for nitric acid, and caustic solutions.
Power Generation: Boiler tubes, flue gas desulfurization systems.
Waste Incineration: Combustion chambers and exhaust systems.
Material Testing:
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Mechanical Testing Such as Tensile of Area
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Hardness Test
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Chemical Analysis – Spectro Analysis
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Positive Material Identification – PMI Testing
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Flattening Test
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Micro and MacroTest
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Pitting Resistance Test
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Flaring Test
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Intergranular Corrosion (IGC) Test
Nuclear power industry:
PWR steam generator heat transfer tubes and primary circuit main pipelines.
Highly radioactive liquid delivery system for nuclear waste reprocessing equipment.
Chemical and petrochemical:
Ethylene cracking furnace convection section furnace tubes and sulfuric acid alkylation reactor internal components.
Molten salt energy storage system (such as sodium nitrate/potassium) high temperature pipelines.
Environmental energy:
Gas waste heat recovery pipelines for waste incinerators (resistant to HCl/dioxin corrosion).
Supercritical CO₂ power generation unit high temperature and high pressure pipelines.
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