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Product information

Grade: Haynes 556
Origin: USA

Haynes 556 is an iron-nickel-chromium-cobalt-based high-temperature alloy, with a balanced combination of chromium, molybdenum, and tungsten. It can resist high-temperature sulfidation, carburization, chlorine-containing atmospheres, molten chlorides, and molten zinc corrosion. It also has excellent high-temperature oxidation and creep resistance, and it works well with both hot and cold processing as well as welding. Because of this, it has long been widely used in high-temperature corrosion environments like waste incinerators, heat treatment furnaces, flue gas desulfurization equipment, electroplating and molten zinc equipment, and high-temperature chemical cracking units.

Product parameter

Chemical Composition

Iron (Fe) content is the remainder, making it the base of Haynes 556 alloy, balancing cost while providing basic high-temperature toughness.  
Chromium (Cr) content ranges from 21.00% to 23.00%, a core anti-oxidation element, resisting high-temperature oxidation and sulfidation corrosion.  
Nickel (Ni) content ranges from 19.00% to 22.50%, stabilizes the austenitic structure, improving weldability and cold-work plasticity.  
Cobalt (Co) content ranges from 16.00% to 21.00%, greatly enhances high-temperature creep rupture strength.  
Molybdenum (Mo) content ranges from 2.50% to 4.00%, improves resistance to chloride ions and molten salt corrosion.  
Tungsten (W) content ranges from 2.00% to 3.50%, synergistically enhances high-temperature strength and crevice corrosion resistance.  
Tantalum (Ta) content ranges from 0.30% to 1.25%, stabilizes grain boundaries and suppresses high-temperature carbide precipitation.  
Carbon (C) content ranges from 0.05% to 0.15%, providing enough carbon to strengthen grain boundaries at high temperatures.  
Manganese (Mn), Silicon (Si), Phosphorus (P), Sulfur (S), Boron (B), and Nitrogen (N) are limited to no more than 1.00%, 0.80%, 0.040%, 0.015%, 0.020%, and 0.30%, respectively, strictly controlling impurities to ensure long-term stability under high-temperature conditions.

Mechanical Properties

Tensile Strength: 880 MPa, indicating the maximum pulling force the material can withstand.  
Yield Strength: 410 MPa, the force at which the material begins to deform permanently.  
Elongation: 29%, showing how much plastic deformation the material can undergo before breaking, ensuring stability in bending and welding.  
Hardness: 230 HB, measuring the material’s resistance to indentation, with good machinability in the annealed state.  
Fatigue Strength: Stable fatigue life under high-temperature sulfidation and chloride-containing fluctuating thermal environments, not prone to stress cracking.  
Elastic Modulus: 205 GPa, reflecting the material’s stiffness, with minimal deformation under high-temperature stress and strong dimensional stability for high-temperature equipment.

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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.
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