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Alloy 800 (commonly referred to as Incoloy 800) is not a typical carbon-steel alloy but rather a nickel-iron-chromium high-temperature alloy. When used for forged flanges, the chemical composition remains consistent with other product forms, with tight controls to meet standards such as ASTM B564 for forgings and related material specifications including UNS N08800.
Chemical Composition (UNS N08800)
Element
Composition Range
Nickel (Ni)
30.0 – 35.0%
Chromium (Cr)
19.0 – 23.0%
Iron (Fe)
Balance (approx. 39 – 46%)
Carbon (C)
≤ 0.10%
Manganese (Mn)
≤ 1.50%
Silicon (Si)
≤ 1.00%
Copper (Cu)
≤ 0.75%
Sulfur (S)
≤ 0.015%
Aluminum (Al)
0.15 – 0.60%
Titanium (Ti)
0.15 – 0.60%
Aluminum + Titanium (Al + Ti)
0.30 – 1.20%
Key Characteristics
High Nickel-Chromium Content: Provides excellent oxidation and carburization resistance at high temperatures, making Alloy 800 flanges ideal for heat exchangers, heater tubes, and petrochemical furnaces.
Iron as Balance Element: Higher iron content compared to other nickel alloys offers cost-effectiveness while maintaining strong high-temperature performance and corrosion resistance.
Controlled Aluminum and Titanium: These additions provide crucial strengthening properties, particularly in related grades like 800H/800HT where carbon, aluminum, and titanium are tightly controlled for enhanced creep strength.
Low Impurity Levels: Minimal sulfur and controlled carbon content ensure excellent weldability and resistance to intergranular corrosion.
Specification Standards
When specifying Alloy 800 forged flanges, reference the following standards:
For critical applications, always verify the exact chemical composition from the mill test certificate (MTC) and ensure alignment with relevant ASTM/ASME specifications for UNS N08800. Minor variations can significantly impact high-temperature performance.
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
