Hastelloy is a trade name for a nickel-based alloy manufactured by Haynes International, Inc. The group of materials sold under that name is resistant to many aggressive chemicals.
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Hastelloy-B alloys are included in the group of highly corrosion-resistant nickel-molybdenum alloys. Hastelloy B contains 26% to 30% molybdenum. These materials are characterised by their good stability in reducing media, e.g. in hydrochloric acid across the full range of concentrations and temperatures.
Hastelloy C was originally developed as a material for the nozzles in jet engines. Its excellent heat resistance properties then made it an ideal choice for many other fields of engineering. These nickel-chromium-molybdenum alloys exhibit outstanding stability in oxidising and reducing media, even at high temperatures. The CX2M [Hastelloy C-22] alloy offers good resistance to wet media, e.g. sulphuric acid, phosphoric acid, nitric acid, chlorine gas, acid mixtures involving sulphuric acid and oxidising acids with chloride ions. One particular feature of this alloy is its high resistance to pitting or crevice corrosion, or stress corrosion cracking at elevated temperatures under oxidising and reducing conditions.
Hastelloy is frequently used in reactors, piping and valves in the chemicals and pharmaceuticals industries and in pressure vessels in nuclear power stations. Alternatives are available in chemical plants in the shape of other nickel-based alloys but also steel and GRP (glass-reinforced plastic) components lined with a chemically resistant material such as perfluoroalkoxy alkanes (PFA).
Inconel alloy 600 / 2.4816 / NiCr15Fe
Good resistance to general corrosion and stress corrosion cracking. Outstanding resistance to oxidation up to approx. 1150 °C. Cannot be used above 550 °C in sulphurous atmospheres. In carbon dioxide, the operation limit is at 500 °C, because from 650 °C severe corrosion will begin. In sodium, Alloy 600 should not be used at temperatures above 750 °C because at that temperature the material begins to degrade. Usable in chlorine-free water up to 590 °C.
Can be easily welded using all standard welding techniques. We recommend annealing before welding. Can be easily soldered and brazed. Very good ductility. Since it is an alloy with a high nickel content, Alloy 600 exhibits good mechanical properties at high temperatures. Since this is a soft but tough material, it pays to apply chip removing operations to the material in its hard, as-rolled state and not after annealing.
Alloy 600 is the standard material for the construction of pressurized water reactors and furnaces, the manufacture of synthetic fibres, glass melting furnace extractors, in the plastics, paper manufacture and food processing industries, in the design of boiler vessels, distillation columns and aviation engines.