B407 N08810 Incoloy 800H Nickel Alloy Steel Seamless Tube End Type Plain End For Superheaters And Furnace

ASTM A407 N08810 Heat Exchanger Tube Chemical Composition

ASTM B407 N08810 Heat Exchanger Tube Application

Tubes are used in extreme environments:

• Petrochemical: Ethylene furnace coils, reformer tubes, pyrolysis units.
• Power Generation: Superheater tubes, heat exchangers, boiler components.
• Nuclear: Steam generator tubing, heat exchangers (resists chloride stress corrosion).
• Industrial Furnaces: Radiant tubes, muffles, conveyor systems.
• Chemical Processing: Acid production, catalyst support grids.

ASTM B407 N08810 Heat Exchanger Tube Strength & Mechanical Properties

• Room Temperature:

Tensile Strength: ≥500 MPa (72.5 ksi)

Yield Strength (0.2% offset): ≥170 MPa (25 ksi)

Elongation: ≥30%

• Elevated Temperature (650°C / 1200°F):

Tensile Strength: ~380 MPa (55 ksi)

Creep Rupture Strength: Excellent (e.g., 10,000 hrs at 815°C: ~20 MPa)

• Key Strengths: Retains structural integrity under thermal cycling/stress; superior to standard stainless steels (e.g., 304/316) above 600°C.
• High-Temperature Performance: Outperforms stainless steels in creep strength above 600°C.
• Corrosion Resistance: Resists oxidation, carburization, and reducing sulfur atmospheres.
• Fabricability: Weldable (using ENiCrFe-3 filler) and formable with standard methods.
• Cost-Effective: More economical than high-nickel alloys (e.g., Inconel) for moderate temperatures.

ASTM B407 N08810 Heat Exchanger Tube FAQ

1. What distinguishes Incoloy 800H from standard Incoloy 800?

800H has a higher carbon content (0.05–0.10% vs. 0.03% max in 800) for superior creep resistance at >600°C.

It undergoes solution annealing at ≥1100°C to achieve an ASTM No. 5 or coarser grain size, optimizing high-temperature strength.

2. What temperatures can Incoloy 800H tubes handle?

Continuous Service: Up to 815°C (1500°F).

Short-Term Exposure: Up to 950°C (1740°F).

Critical Note: For >900°C, Incoloy 800HT (Ti/Al-controlled) is preferred for enhanced stability.

3. Is welding 800H tubes difficult?

Weldable via:

TIG/GTAW with ERNiCr-3 (FM 82) filler.

SMAW with ENiCrFe-3 electrodes.

Post-Weld Requirement: Solution annealing (1100–1175°C) is essential to restore corrosion/creep resistance.