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Incoloy 800H B409 Plates

Incoloy 800H B409 Plates
Material Grade: Incoloy 800H (UNS N08810)
Standard Specification: ASTM B409 / ASME SB409
Structural Edge: Enhanced Creep & Stress-Rupture Strength
Carbon Control: Controlled Carbon (0.05% - 0.10%) for High Heat
Thermal Threshold: Optimized for Service Above 600°C (1100°F)
Metallurgical Feature: Solution Annealed for Coarse Grain Structure
Thickness Range: 0.5 mm to 50 mm
Key Applications: Ethylene Furnaces, Steam Reforming, & Power Piping
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Incoloy 800H (UNS N08810) Plates, produced under the ASTM B409 specification, represent a specialized high-carbon version of the standard Incoloy 800 alloy. While it shares the same base nickel-iron-chromium chemistry, Alloy 800H is precision-engineered with a controlled carbon content (0.05% to 0.10%) and is subjected to a high-temperature solution annealing process. This specific heat treatment ensures a coarse grain structure, which is the defining factor in providing significantly higher creep and stress-rupture strength. These plates are the industry standard for structural applications where the material must withstand prolonged mechanical stress at temperatures exceeding 600°C (1100°F).

The technical superiority of ASTM B409 Incoloy 800H is particularly evident in the petrochemical and power generation sectors. Because it maintains its structural integrity and resists embrittlement during long-term thermal exposure, it is the premier choice for ethylene furnace pigtails, steam-methane reformer headers, and power plant superheater tubing. Beyond its mechanical endurance, the alloy provides excellent resistance to oxidation, carburization, and nitriding, forming a robust barrier against environmental degradation. For engineers designing pressure vessels, heat exchangers, and thermal processing equipment, Incoloy 800H plates offer the ideal combination of metallurgical stability and high-temperature performance required for safety-critical industrial operations.



Incoloy 800H B409 Plates Features

  • » Superior Creep and Rupture Strength: Specifically heat-treated to ensure a coarse grain structure, providing significantly higher stress-rupture properties than standard Alloy 800 at temperatures above 600°C (1100°F).
  • » Controlled Carbon Chemistry: Maintains a precise carbon range of 0.05% to 0.10%, which is critical for enhancing the alloy’s long-term mechanical stability in extreme heat.
  • » Excellent High-Temperature Oxidation: Forms a resilient protective scale that resists scaling and metal loss in oxidizing atmospheres, ensuring longevity in furnace environments.
  • » Carburization Resistance: The high nickel and chromium content provides a strong defense against carbon absorption, making it ideal for hydrocarbon processing and ethylene production.
  • » Metallurgical Stability: Engineered to resist embrittlement during prolonged exposure to high temperatures, maintaining its toughness and ductility throughout its service life.
  • » Resistance to Internal Oxidation: Demonstrates superior resistance to internal oxidation in various industrial gases, protecting the alloy’s internal matrix from degradation.
  • » Versatile Joining Options: Readily weldable using matching composition filler metals (such as Inconel 82 or 617), ensuring high-strength joints that match the base metal's thermal performance.
  • » Aqueous Corrosion Shield: While designed for heat, it also provides excellent resistance to many corrosive media, preventing damage during process shutdowns or ambient-temperature cycles.

Incoloy 800H B409 Plates Specification

Standards

  • ASTM Standard: B409
  • ASME Standard: SB409
  • UNS Number: N08810
  • WNR Number: 1.4958

Chemistry

  • Nickel (Ni): 30.0% – 35.0%
  • Chromium (Cr): 19.0% – 23.0%
  • Carbon (C): 0.05% – 0.10%
  • Al + Ti: 0.30% – 1.20%

Mechanical Data

  • Yield Strength: 170 MPa (Min)
  • Tensile Strength: 450 MPa (Min)
  • Elongation: 35% (Min)
  • Grain Size: ASTM No. 5 or Coarser

Physical Info

  • Density: 7.94 g/cm³
  • Melting Point: 1357 – 1385°C
  • Service Temp: 600°C to 950°C
  • Specific Heat: 460 J/kg·K

Size Range

  • Thickness: 0.5 mm to 50 mm
  • Width: Up to 2500 mm
  • Length: Up to 12000 mm
  • Condition: Solution Annealed

Testing & QC

  • Cert: EN 10204 3.1 / 3.2
  • Testing: Creep-Rupture / Stress
  • Analysis: Optical Emission Spectrometry
  • Compliance: PED / ISO / TUV

Incoloy 800H B409 Plates Detailed Specifications

Property Specification
Specification ASTM B409 / ASME SB409
Width 1000mm - 2500mm
Thickness 0.5mm - 50mm
Length 2000mm - 6000mm
Supply Condition Hot-Rolled, Cold-Rolled, Annealed, and as per customer requirements
Impact Tested -196°C
Process of Manufacturing Hot-Rolled, Cold-Rolled, Annealing, Pickling, and Passivation

Incoloy 800H B409 Plates Chemical Composition

Element Composition %
Nickel (Ni) 30.0 - 35.0
Iron (Fe) 39.0 - 46.0
Chromium (Cr) 19.0 - 23.0
Nickel (Ni) Balance
Cobalt (Co) 1.0 max
Manganese (Mn) 1.5 max
Silicon (Si) 1.0 max
Carbon (C) 0.05 max
Sulfur (S) 0.03 max
Phosphorus (P) 0.04 max

Incoloy 800H B409 Plates Mechanical Properties

Property Value
Tensile Strength 80,000 psi (550 MPa) min
Yield Strength 35,000 psi (240 MPa) min
Elongation 30% (in 2 inches / 50 mm)
Hardness Rockwell B: ≤ 90
Modulus of Elasticity 205 GPa

Incoloy 800H B409 Plates Equivalent Grades

Standard ASTM B409 ASME SB409 UNS Werkstoff Nr. ISO
Equivalent Grade Incoloy 800H Incoloy 800H N08810 1.4958 NiCr20Fe

Industrial Locations & Keywords

Industrial Locations & Keywords
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