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| ब्रांड नाम: | YUHONG |
| मॉडल संख्या: | एएसटीएम बी163 यूएनएस एन08810 यू बेंड हीट एक्सचेंजर ट्यूब |
| एमओक्यू: | 1000KGS |
| मूल्य: | विनिमय योग्य |
| भुगतान की शर्तें: | एल/सी,टी/टी |
ASTM B163 / ASME SB163 UNS N08810 Alloy 800H U Bend Tube Serpentine Heat Exchanger Tube
A Serpentine Coil Tube in Incoloy 800H with U-Bends is a premium engineered component designed for the harshest thermal environments. The material provides the necessary high-temperature strength, while the serpentine design accommodates thermal movement, ensuring long-term reliability in furnaces and high-temperature reactors.
Advantages of the U-Bend Serpentine Design:
Thermal Expansion Compensation: Incoloy 800H is often used where temperatures fluctuate wildly. The serpentine coil acts as a built-in expansion loop. The bends absorb the thermal expansion and contraction of the tube, reducing stress on the tube sheets and headers.
Compact Footprint: By stacking the passes vertically or horizontally, a very long tube length can be fitted into a small space (like a furnace or a duct).
Counter-Current Flow: Serpentine coils are easily arranged so the hottest fluid meets the hottest gas, maximizing thermal efficiency.
ASTM B163 / ASME SB163 Incoloy 800H UNS N08810 Seamless Nickel Alloy Tube Chemical Composition %
| Material | Ni | Cr | Fe | C | Al | Ti |
| Incoloy 800 | 30.0-35.0 | 19.0-23.0 | ≥39.5 | ≤0.1 | 0.15-0.60 | 0.15-0.60 |
| Incoloy 800H | 30.0-35.0 | 19.0-23.0 | ≥39.5 | 0.05-0.10 | 0.15-0.60 | 0.15-0.60 |
| Incoloy 800HT | 30.0-35.0 | 19.0-23.0 | ≥39.5 | 0.06-0.10 | 0.25-0.60 | 0.25-0.60 |
ASTM B163 / ASME SB163 Incoloy 800H UNS N08810 Seamless Nickel Alloy Tube Mechanical Properties
| Material | Tensile Strength | Yield Strength | Elongation | Hardness |
| Incoloy 800 | 500 N/mm² | 210 N/mm² | 35% | 135-179HB |
| Incoloy 800H | 531 N/mm² | 200 N/mm² | 52% | 127HB |
| Incoloy 800HT | 531 N/mm² | 200 N/mm² | 52% | 127HB |
The "H" is for Heat – Specifically, a Thermal Process
While people know "H" stands for "high-temperature," the specific requirement is often overlooked:
It's Not Just Chemistry: To be legitimately called 800H, the material must be solution annealed at a minimum temperature of 2100°F (1149°C). This isn't just for stress relief; it's to achieve a specific ASTM grain size of 5 or coarser.
Application
Because of the cost and performance of Incoloy 800H, these serpentine coils are used in critical, high-temperature environments:
Ethylene Pyrolysis Furnaces: Used for steam cracking of hydrocarbons. The coils must withstand coking and decoking cycles at extreme temperatures.
Reformer Units (Hydrogen Plants): Located in the convection section of steam methane reformers to preheat feedstock.
Heat Recovery Steam Generators (HRSG): Specifically in the superheater or reheater sections where steam temperatures are highest.
Molten Salt Heaters: In solar thermal power plants or chemical processes where the salt is heated to over 1000°F.
Ammunition/Explosives Manufacturing: Used in cooling tunnels where precise temperature control is required, and corrosion from byproducts is a factor.
