The registered trademark name, Hastelloy, is applied as the prefix name to more than twenty different highly corrosion resistant metal alloys produced by Haynes International, Inc. These superalloys, or high performance alloys, developed by Haynes International, are nickel-based steel alloys that exhibit traits that include high resistance to uniform attack, localized corrosion/oxidation resistance, stress corrosion cracking resistance and ease of welding and fabrication.
Hastelloy C22, also known as alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel steel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions.
Other corrosives Hastelloy C-22 has resistance to are oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both organic and inorganic. This nickel alloy also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi- purpose plants where such “upset” conditions occur frequently.
Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures.
This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.Although there are several variations of theHastelloy nickel alloy, Hastelloy C-276 is by far the most widely used. Alloy C-276 is widely used in the most severe environments such as chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and recovery of sour natural gas.
Hastelloy C22 / C276 Plate Grade and Specification
| Standard | ASTM,AISI, AMS,MLS,EN,JIS,DIN,GOST, ASTM / ASME SB 162 UNS 2200 (NICKEL 200) / UNS 2201 (NICKEL 201) ,ASTM / ASME SB 127 UNS 4400 (MONEL 400) ,ASTM / ASME SB 424 UNS 8825 (INCONEL 825) ,ASTM / ASME SB 168 UNS 6600 (INCONEL 600) / UNS 6601 (INCONEL 601), ASTM / ASME SB 443 UNS 6625 (INCONEL 625), ASTM / ASME SB 574 UNS 10276 (HASTELLOY C 276) ,ASTM / ASME SB 462 UNS 8020 (ALLOY 20 / 20 CB 3) |
| Thickness | 1.2-100mm |
| Width | 1000-1500mm |
| Length | 1000-6000mm |
| Surface | 2B, No.3, No.4, HL, BA, 8K |
| Manufacturing process | Hot rolled, cold rolled |
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