Combustion gases and corrosive deposits can rapidly destroy waste incinerators burning municipal, industrial, or hazardous wastes. When super heater tubes, rapper bars, ties, soot blowers, plenum chambers, or other key components made from stainless steels or iron-nickel alloys fail, it means expensive downtime and maintenance costs. HAYNES® 556® alloy has demonstrated high-temperature corrosion resistance that exceeds the performance of these materials. Laboratory and field tests in sulfur-bearing, chlorine-bearing, and molten salt environments show 556® alloy to be the most versatile alloy for resistance to the various conditions encountered by waste incinerator components. In addition, 556® alloy displays in-service creep and tensile strength more than double those of many stainless steels and iron-nickel alloys. 556® alloy is covered by ASME Code under case numbers 2010 (Section 1) and 2128 (Section 8). This allows for substantial weight savings and design freedom in component manufacture.
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, air 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 pulp and paper industries.
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