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| ชื่อแบรนด์: | YUHONG |
| เลขรุ่น: | ASME SB163 UNS N08825 ท่อไร้รอยต่อโลหะผสมนิกเกิล |
| ขั้นต่ำ: | 500กก |
| ราคา: | โปร่ง |
| รายละเอียดการบรรจุ: | กล่องไม้ชั้น / มัดพร้อมฝาพลาสติก |
| เงื่อนไขการจ่ายเงิน: | แอล/C,ที/ที |
ASME SB163 UNS N08825 / Incoloy 825 Nickel Alloy Tube Seamless Heat Exchanger Tube
The "Goldilocks" Economic Advantage
Cost-Effective Upgrade: It costs roughly 3.5–4.5x more than 316L, but only ~50–60% of the cost of Hastelloy C-276 or Alloy 625. It occupies the critical middle tier—used precisely when 316L is guaranteed to fail, but C-276 would be over-engineered and budget-breaking.
Extended Service Life: In sour oil/gas and phosphoric acid plants, its lifespan often exceeds 15–20 years, drastically reducing plant downtime for re-tubing compared to carbon steel or low-grade stainless.
NACE Compliance: It fully complies with NACE MR0175 / ISO 15156 for sour service, eliminating the need for expensive chemical inhibition dosing in H₂S environments.
Equivalent Grades of ASME SB163 UNS N08825 / Incoloy 825 Nickel Alloy Tube Pickled Heat Exchanger Tube
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Incoloy 825 | 2.4858 | N08825 | NCF 825 | NA 16 | ЭП703 | NFE30C20DUM | NiCr21Mo | XH38BT |
Chemical Composition % of ASME SB163 UNS N08825 / Incoloy 825 Nickel Alloy Tube Pickled Heat Exchanger Tube
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| Incoloy 825 | 0.05 max | 1.00 max | 0.05 max | 0.03 max | 1.50 – 3.00 | 22.00 min | 38.00 – 46.00 | 19.50 – 23.50 | 0.02 max | 0.06 – 1.20 |
Mechanical properties of ASME SB163 UNS N08825 / Incoloy 825 Nickel Alloy Tube Pickled Heat Exchanger Tube
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Incoloy 825 | 8.14 g/cm3 | 1400 °C (2550 °F) | Psi – 80,000 , MPa – 550 | Psi – 32,000 , MPa – 220 | 30 % |
Exceptional Corrosion Resistance (Application Suitability)
Incoloy 825 is chosen for heat exchangers because it resists a wide range of aggressive media:
Sulfuric Acid: Excellent resistance up to 60°C in various concentrations.
Phosphoric Acid: Superior resistance, widely used in fertilizer production.
Organic Acids: Resists formic, acetic, and fatty acids.
Chloride Stress Corrosion Cracking (SCC): While not as immune as Alloy 600, it offers superior resistance to chloride SCC compared to 304/316 stainless steels.
Pitting/Crevice Corrosion: The Molybdenum content provides robust resistance in seawater and brackish water.
Oxidizing/Acid Chlorides: Resists pitting in sour service (H₂S) environments.
Application
These tubes are critical in severe operating environments:
Oil & Gas: Sour gas processing, downhole tubing, and cooler/condenser units handling H₂S and CO₂.
Chemical Processing: Heat exchangers in the production of sulfuric acid, phosphoric acid (wet-process), and petrochemical cracking.
Marine & Offshore: Shipboard heat exchangers, seawater cooling systems, and ballast water treatment units.
Pollution Control: Wet scrubber systems and flue gas desulfurization (FGD) heat exchangers.
Nuclear Fuel Reprocessing: Due to its resistance to nitric acid.
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