Incoloy 800HT (UNS N08811): Certified Supplier of Round Bars, Seamless Tubes & Plates

By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | 2026

Quick Answer: What Is Incoloy 800HT?

Incoloy 800HT (UNS N08811 / W.Nr. 1.4959) is a nickel-iron-chromium alloy specifically designed for high-temperature structural applications. It is a controlled-composition version of Incoloy 800H, with tighter limits on carbon (0.06-0.10%) and aluminum plus titanium (0.85-1.20%). These modifications, combined with a high-temperature solution anneal, provide significantly higher creep and stress-rupture strength at temperatures above 700°C (1290°F) compared to standard 800 or 800H grades.

Product Overview

Incoloy 800HT (UNS N08811) is the "high-performance" member of the 800 series family. While sharing the base nickel-iron-chromium chemistry that resists oxidation, carburization, and sulfidation, the 800HT grade is uniquely optimized for long-term creep resistance. The addition of aluminum and titanium, coupled with a mandatory coarse grain size (ASTM No. 5 or coarser), ensures the material maintains structural integrity under sustained load in the hottest sections of industrial plants.

Key properties include:

• Superior Creep-Rupture Strength: Engineered to outperform 800H above 700°C.
• Oxidation Resistance: Forms a stable, protective chromium-rich scale.
• ASME Code Compliance: Fully approved for pressure vessel and piping design.
• Microstructural Stability: Resists embrittlement during long-term high-temperature exposure.

Incoloy 800HT is the standard material for Ethylene Cracking Furnaces, Steam Methane Reformers (SMR), and Heat-Treating Equipment. Founded in 2012, Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer delivering premium 800HT materials to over 32 countries worldwide.

Executive Standards

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Shanghai Hangbo Alloy Group Co., Ltd. — Your Trusted Partner in High-Temperature Superalloys.