Incoloy 800HT (UNS N08811) Supplier | Bar, Tube, Plate - Hangbo Alloy

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.

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Applications of Incoloy 800

Incoloy 800 (UNS N08800) is widely used in heat exchangers, industrial furnaces, carburizing equipment, sheathed heating elements, nuclear steam generator tubing. The alloy maintains excellent mechanical properties at temperatures up to 1500F (816C) for prolonged service, making it suitable for demanding high-temperature service environments.

Standards & Specifications: ASTM B409, ASME SB409