ASTM B514 Inconel 800H N08800 Nickel Alloy Welded Pipe for Gas Processing
ASTM B514 is standard developed by the American Society for Testing and Materials, specifically addresses "welded nickel-iron-chromium alloy pipe," prescribing the product's chemical composition, mechanical properties, dimensional tolerances, testing methods, and technical requirements. UNS N08800 alloy steel is more commonly known commercially as Incoloy 800.
Although strictly speaking, Incoloy 800 is a nickel-iron-chromium alloy with a nickel content of approximately 30-35% and an iron content of approximately 39%, its properties are closer to those of nickel-based alloys, and for this reason, it is often referred to as such. Welded pipe, unlike seamless pipe, is produced by cold-rolling flat sheets or coils and then welding the seams together. The welding method of choice is typically shielded inert gas welding, such as TIG.
ASTM B514 N08800 Quality Control and Testing Requirements
- Chemical Composition Analysis: Verifies that the alloy composition meets the requirements of N08800.
- Mechanical Property Testing: Such as tensile testing, verifies tensile strength, yield strength, etc.
- Hydraulic Testing or Nondestructive Testing: Each pipe must undergo a hydrostatic test, or alternative nondestructive testing methods such as eddy current testing or radiographic testing, to verify its sealing and weld integrity.
- Dimensional and Wall Thickness Inspection.
- Weld Macrostructure Inspection: Checks the weld fusion and form quality.
- Intergranular Corrosion Testing (if required): Evaluates the material's resistance to intergranular corrosion.
ASTM B514 N08800 800H Chemical Composition
| UNS. | Ni | C | Fe | Si | Mn | S | AI | Ti | Cu | Cr |
| N08800 | 30-35 | 0.1 max | 39.5 min | 1.0 max | 1.5 max | 0.015 max | 0.15-0.60 | 0.15-0.60 | 0.75 max | 19-23 |
ASTM B514 N08800 800H Mechanical Properties
| UNS. | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| N08800 | 7.94 g/cm3 | 1385 °C (2525 °F) | Psi – 75,000 ,
MPa – 520 | Psi – 30,000 , MPa – 205 | 30 % |
ASTM B514 N08800 Nickel-Based Alloy Welded Pipe Application
- Petrochemical and Refining: Key equipment for hydrogen production, such as steam methane reformers, furnace tubes and gas headers, ethylene cracker tubes and transmission pipelines, heat exchanger piping, and transfer lines.
- Process Chemical Industry: Phthalic anhydride and maleic anhydride production equipment, and heat exchangers in sulfuric acid recovery units.
- Power Industry: Superheated steam piping and heat exchanger piping in nuclear power plants, and heat exchanger piping in supercritical boilers in high-efficiency thermal power plants.
- Heat Treatment and Industrial Furnaces: Radiant tubes, muffles, and furnace rollers used in processes such as carburizing, annealing, and nitriding.
- Waste Heat Recovery Systems: Boilers and heat exchangers that recover heat from high-temperature exhaust gases.
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ASTM B514 N08800 Inconel 800H Inconel Nickel Alloy Welded Pipe for Gas Processing Images
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