Incoloy 800 Plates: 816 °C Continuous Service and Excellent Formability

Product Overview

Incoloy 800 Plates are wrought, austenitic alloys combining nickel, iron, and chromium to achieve superior high-temperature strength and corrosion resistance. The alloy’s formulation—30–35 % Ni, 19–23 % Cr, 39–46 % Fe, 0.15 % C, 1 % Mn, 1 % Si, 0.6 % Al, 0.6 % Ti—maintains an austenitic structure and resists grain-boundary carbide formation, minimizing embrittlement during prolonged exposures at 760–816 °C. Its solid-solution strengthening, enhanced by high Cr and Al, forms protective chromia and alumina scales, delivering oxidation and carburization resistance in gas-turbine environments and furnace atmospheres. In chemical and petrochemical services, Incoloy 800 Plates resist nitric and sulfuric acids, chloride stress-corrosion cracking, and caustic attack, making them ideal for heat exchangers, reaction vessels, and piping systems under severe conditions. Excellent weldability (TIG/GTAW, electron beam) and ductility (elongation ≥ 30 %) allow complex panel fabrication and heavy-gauge forming without post-weld degradation. Available in thicknesses from 2 mm to 100 mm and widths up to 2 m, Incoloy 800 Plates meet global standards for pressure-containing and high-temperature applications.

Chemical Composition

Mechanical Properties

Physical Properties

Conformance Standards

• ASTM B407 / ASME SB-407 – Nickel-Iron-Chromium Alloy Plate

• AMS 5542 – Special Quality UNS N08800 Plate

• ISO 15156-3 / NACE MR0175-3 – Sour-Service Compatibility

• UNS N08800 / W. Nr. 1.4876 – Material Designation

Applications

• Chemical Processing: Heat exchangers, piping, reaction vessels, nitric acid service

• Petrochemical & Refining: Reforming furnace coils, reactor internals

• Power Generation: Gas-turbine transition ducts, combustor liners

• Furnace Equipment: Radiant tubes, retorts, heating-element sheathing

• Marine: Desalination plant panels, seawater coolers

Frequently Asked Questions

Q1: What temperature range is suitable for Incoloy 800 Plates?
A1: Continuous service up to 816 °C with cycle resistance to 982 °C, maintaining mechanical and corrosion performance.

Q2: Are Incoloy 800 Plates weldable and formable?
A2: Yes—TIG/GTAW and EB welding preserve alloy properties; ductility ≥ 30 % enables stamping and bending without cracking.

Q3: Which industries benefit most from Incoloy 800 Plates?
A3: Chemical, petrochemical, power generation, furnace manufacturing, and marine sectors due to heat and corrosion resilience.