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Product information

Grade: HAYNES 233  
Origin: USA  

HAYNES 233 is an age-hardenable nickel-cobalt-chromium-molybdenum-aluminum high-temperature alloy. It forms a stable alumina protective layer thanks to its aluminum content, and combines solid solution strengthening with carbide strengthening to achieve excellent high-temperature creep performance. It has outstanding oxidation resistance under both hot and cold cycling conditions, along with good hot and cold workability and weldability. It can maintain stable oxidation resistance up to 1149°C, and its strength can be further enhanced through aging in the medium temperature range. It offers balanced high-temperature oxidation resistance and carburization resistance, and is highly adaptable to hot and cold forming processes. For decades, it has been widely used in high-temperature oxidation environments, such as the hot section components of aircraft gas turbines, industrial gas turbine combustion chambers, high-temperature heat treatment tools, high-temperature sensor protection tubes, and new energy high-temperature structural components.

Product parameter

Chemical composition

The nickel (Ni) content is the remainder and serves as the base matrix for HAYNES 233 alloy, stabilizing the austenitic structure and ensuring high-temperature toughness.
The chromium (Cr) content ranges from 18.00%~20.00%, forming a protective layer of chromium oxide that enhances resistance to oxidation and sulfur corrosion.
Cobalt (Co) content 18.00%~20.00%, stabilizes matrix structure and improves long-lasting high-temperature creep performance.
Molybdenum (Mo) content 7.00%~8.00%, core solid solution strengthening element, effectively enhancing high-temperature creep resistance and corrosion resistance.
Aluminum (Al) content 3.00%~3.50%, forming a dense alumina film at high temperatures, significantly enhancing high-temperature oxidation resistance.
Titanium (Ti) content 0.40%~0.60%, helps stabilize the structure and enhances aging effects with aluminum.
Tantalum (Ta) content 0.40%~0.80%, refining the precipitate phase, improving long-term high-temperature tissue stability.
Carbon (C) content 0.05%~0.12%, appropriate carbon forms grain boundary carbides, enhancing high-temperature grain boundary strength.
Manganese (Mn) content 0.10%~0.40%, optimizing hot workability and reducing the risk of hot cracks.
Silicon (Si) content 0.04%~0.20%, melted and deoxidized, strictly controlled to prevent brittle phase formation.
Boron (B) content does not exceed 0.006%, refines grain boundaries, and suppresses high-temperature intergranular cracking.
Iron (Fe), tungsten (W), zirconium (Zr), and yttrium (Y) must not exceed 1.50%, 0.30%, 0.050%, and 0.025% respectively. Phosphorus (P) and sulfur (S) are strictly controlled, impurities are strictly limited, ensuring stability during welding and high-temperature conditions.

Mechanical properties

Tensile strength: 1187 MPa, indicating the maximum tensile force the material can withstand.
Yield strength: 778 MPa, the force at which the material begins to undergo permanent deformation.
Elongation: 27%, indicating the amount of plastic deformation the material can undergo before stretching to fracture, with stable and controllable forming and welding processes.
Hardness: 340 HB, which is the material's ability to resist hard objects pressing into its surface. After aging strengthening, strength increases, and cutting must match process parameters.
Fatigue strength: Stable fatigue life under high-temperature cycling heat loads and alternating oxidation atmospheres, strong adhesion of the oxide film and resistance to peeling and failure.
Elastic modulus: 216 GPa, reflecting the material's stiffness. It has minimal deformation under high-temperature stress and excellent dimensional stability of high-temperature pressure-bearing 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.
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