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Product information

Grade: UNS N08811
Manufactured in: USA

UNS N08811 is an improved austenitic nickel-iron-chromium heat-resistant alloy with controlled total aluminum and titanium content. Based on 800H, it precisely regulates carbon and aluminum-titanium levels, and is paired with high-temperature coarse-grain solution treatment above 1149℃. Its long-term high-temperature creep strength is 20%–30% higher than 800H, with excellent resistance to high-temperature oxidation, carburization, and sulfur-containing atmospheres. It’s stable in hot and cold working, welding, and forming, and can be used long-term at temperatures up to 950℃. Because of this, it has been widely used for many years in areas like petrochemical cracking furnace tubes, power plant boiler superheaters/reheaters, heat treatment radiation tubes, high-temperature pressure components in coal gasification, waste incineration waste heat boilers, and other high-temperature, high-pressure creep conditions.

Product parameter

Chemical Composition

Iron (Fe) content is the remainder (≥39.50%), serving as the base for UNS N08811 alloy, which helps reduce raw material costs and optimizes hot workability.
Nickel (Ni) content ranges from 30.00% to 35.00%, stabilizing the austenitic structure and providing high-temperature toughness and basic corrosion resistance.
Chromium (Cr) content ranges from 19.00% to 23.00%, forming a dense chromium oxide layer to resist high-temperature oxidation, carburization, and sulfidation corrosion.
Carbon (C) content is between 0.06% and 0.10%, allowing precise control of carbon to precipitate grain boundary carbides, greatly enhancing high-temperature creep resistance.
Aluminum (Al) content is 0.15%~0.60%, titanium (Ti) content 0.15%~0.60%, with the total Al + Ti strictly controlled at 0.85%~1.20%, forming a small amount of γ' phase to strengthen medium-temperature long-term performance (LION ALLOY).
Copper (Cu) content does not exceed 0.75%, slightly improving low-temperature corrosion resistance.
Manganese (Mn), silicon (Si), phosphorus (P), and sulfur (S) do not exceed 1.50%, 1.00%, 0.040%, and 0.015% respectively, keeping impurities strictly limited to ensure long-term high-temperature stability.

Mechanical Properties

Tensile Strength: 590 MPa, indicating the maximum stretching force the material can withstand.
Yield Strength: 240 MPa, the force at which the material begins to deform permanently.
Elongation: 42%, indicating how much the material can stretch before breaking; bending and pipe forming are less likely to crack.
Hardness: 185 HB, measuring the material's resistance to surface indentation; easy to machine in the annealed state.
Fatigue Strength: Stable in high-temperature carburizing and alternating hot-cold flue gas environments; long-term high-temperature pressure cycles are unlikely to cause creep cracking.
Elastic Modulus: 196 GPa, reflecting the material’s stiffness; minimal deformation under high-temperature stress, excellent dimensional stability for furnace tubes and heat exchanger components.

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Shiyu Metal Material Technology Co., Ltd. is a collection of procurement, processing, agent, sales, logistics, warehousing in one of the enterprises, the company has a large-scale spot supply base in China, with domestic and foreign large steel mills and suppliers to maintain good relations of cooperation, with a full range of multi-channel procurement resources.
Shiyu Metal main products: nickel base alloy, Hastelloy, super austenitic stainless steel, duplex stainless steel, cobalt base alloy, pure nickel, titanium and titanium alloy, heat resistant, corrosion resistant alloy and other kinds of steel, a large number of product categories, can meet the size and thickness customization, prefabrication and other diversified needs.
The company has ISO9001 quality certification, the company's product standards include: the United States (UNS) ASTM /ASME, AMS, German DIN/EN, Japan (SUS) JIS and other standards supply, provide the original material certificate. We can supply according to the standards and technical requirements provided by customers to ensure that the goods and specifications are complete to meet the needs of various merchants. From raw materials to finished products, all go through three quality inspection to ensure the qualified rate of finished products. Shiyu Metal strives for perfection in every detail to ensure that the quality of products in different countries and regions around the world can meet international standards. Shiyu Metal has established a good strategic cooperative relationship with the world famous steel mills such as HAYNES, ATI, SPECIALMETALS, VDM, OUTOKUMPU, Japan Metallurgy, Nippon Steel, and Datong Special Steel.
The products supplied by Shiyu Metal are widely used in nuclear power, petrochemical, mechanical engineering, precision processing, aerospace, electronic instruments, medical equipment, automobile manufacturing, environmental protection, wind power application, seawater desalination, shipbuilding industry, paper making machinery, mining engineering, cement manufacturing, metallurgical manufacturing, corrosion resistant environment field, high temperature environment field, mold field, etc. It is a global high-quality supplier of special steel materials.
Shiyu Metal Material Technology Co., Ltd. is committed to the purchase, agent and sales of special steel, and has a perfect special steel sales management system and product quality supervision system. The company has been adhering to the "integrity, innovation, responsibility, win-win" business philosophy, adhere to the "quality first, customer first" service purpose, to provide customers with quality services and high-quality steel products. Shiyu Metal actively participates in the development of domestic steel industry ecology, and is willing to contribute to the development of national special steel.



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