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HAYNES® Alloys

For High-Speed Fans in Carburizing and Industrial Furnaces

Long-lived furnace components can be crucial for cost-effective heat-treatment. Downtime due to furnace fan failures or insufficient fan life costs the heat treater money. How can furnace fan life be extended and reliability increased? By using HAYNES® 556® alloy -that’s how. HAYNES 556 alloy combines outstanding high-temperature strength and long-term resistance to carburization compared to conventional materials. Fans fabricated from 556 alloy are designed to last in excess of ten thousand hours at temperatures up to 2000°F (1093°C). This is due in part to the alloy’s excellent high-temperature creep and stress rupture properties. Because of its outstanding high temperature strength, 556 alloy can be designed thinner than conventional materials. This not only reduces materials costs, but allows for faster furnace heat-up and cool-down cycles. This saves on furnace costs and increases productivity. Can you afford not to consider 556 alloy?

31031 

Nominal Composition

Iron: Balance
Nickel: 20
Cobalt: 18
Chromium: 22
Molybdenum: 3
Tungsten: 2.5
Tantalum: 0.6
Nitrogen: 0.2
Silicon: 0.4
Manganese: 1
Aluminum: 0.2
Carbon: 0.1
Lanthanum: 0.02
Zirconium: 0.02

Typical Tensile Properties, Plate

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 55 375 116 805 51
1000 540 31 210 90 625 60
1200 650 31 210 83 575 57
1400 760 29 200 69 470 53
1600 870 28 190 49 340 69
1800 980 19 130 31 210 84
2000 1095 9 60 16 110 95

Typical Rupture Properties, Plate

Test Temperature Typical Rupture Properties: Stress Required to Produce Rupture in Hours Shown
100 h 1,000 h 10,000 h
°F °C ksi MPa ksi MPa ksi MPa
1400 760 25.0 172 17.5 121 11.9 82
1500 815 17.0 117 11.8 81 7.8 52
1600 870 11.5 79 7.5 52 4.9 34
1700 915 7.6 52 4.8 33 3.0 21
1800 980 4.8 33 3.0 21 1.9 13

Typical Room Temperature Physical Properties

Physical Property British Units Metric Units
Density 0.297 lb/in3 8.23 g/cm3
Electrical Resistivity 37.5 µohm-in 95.2 µohm-cm
Modulus of Elasticity 29.7 x 106 psi 206 GPA
Thermal Conductivity 77 Btu-in/ft2-h-°F 11.1 W/m-°C
Specific Heat 0.111 Btu/lb-°F 464 J/Kg-°C

Environmental Resistance

Oxidation in Air - Excellent at 2000°F (1095°C)

Sulfidation - Second only to Co-base alloys

Molten Chloride Salts - Equal to alloy X

Chlorination - Very good to 1650°F (900°C)

Carburization - Equal to alloy 800H

Molten Zinc - Best Available

Product Description

HAYNES 556 alloy is an iron-nickel-chromium-cobalt alloy that combines effective resistance to sulfidizing, carburizing, and chlorine-bearing environments at high temperatures with good oxidation resistance, fabricability, and excellent high-temperature strength. It has also been found to resist corrosion by molten chloride salts and molten zinc.

HAYNES 556 alloy is highly useful for service at elevated temperature in moderately to severely corrosive environments. Applications include tubing and structural members in waste heat recuperators, super heaters, and internals in municipal and chemical waste incinerators; power plant burner buckets, cair nozzles, and fluidized bed combustor heat exchangers and internals; high speed furnace fans, galvanizing bath hardware and brazing fixtures; and high-temperature rotary calciners and kilns. There are also additional uses in the chemical petrochemical process and pump and paper industries.

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