{"id":13083,"date":"2024-08-06T16:16:42","date_gmt":"2024-08-06T16:16:42","guid":{"rendered":"https:\/\/haynesintl.com\/alloys\/%e5%90%88%e9%87%91%e7%9b%ae%e5%bd%95\/%e9%ab%98%e6%b8%a9%e5%90%88%e9%87%91\/haynes-556\/"},"modified":"2025-02-24T14:00:07","modified_gmt":"2025-02-24T14:00:07","slug":"haynes-556-%e5%90%88%e9%87%91","status":"publish","type":"alloys","link":"https:\/\/haynesintl.com\/zh-hans\/alloys\/%e5%90%88%e9%87%91%e7%9b%ae%e5%bd%95\/%e9%ab%98%e6%b8%a9%e5%90%88%e9%87%91\/haynes-556-%e5%90%88%e9%87%91\/","title":{"rendered":"HAYNES\u00ae<\/sup> 556\u00ae<\/sup> \u5408\u91d1"},"content":{"rendered":"\n
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Principal Features<\/h2>\n\n\n\n

HAYNES\u00ae<\/sup> 556\u00ae<\/sup> alloy (UNS R30556) 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 other salts, and is resistant to corrosion from molten zinc.<\/p>\n\n\n\n

Ease of Fabrication<\/h3>\n\n\n\n

HAYNES\u00ae<\/sup> 556\u00ae<\/sup> alloy has excellent forming and welding characteristics. It may be forged or otherwise hot-worked, providing that it is held at 2150\u00b0F (1175\u00b0C) for a time sufficient to bring the entire piece to temperature. As a consequence of its good ductility, 556\u00ae<\/sup> alloy is also readily formed by cold working. All hot- or cold-worked parts should be annealed and rapidly cooled in order to restore the best balance of properties.<\/p>\n\n\n\n

The alloy can be welded by a variety of techniques, including gas tungsten arc (GTAW), gas metal arc (GMAW), shielded metal arc (coated electrode), and resistance welding.<\/p>\n\n\n\n

Heat Treatment<\/h3>\n\n\n\n

HAYNES\u00ae<\/sup> 556\u00ae<\/sup> alloy is furnished in the solution heat treated condition, unless otherwise specified. The alloy is normally solution heat treated at 2150\u00b0F (1175\u00b0C) and rapidly cooled or water-quenched for optimum properties. Heat treatments at temperatures lower than the solution heat-treating temperature may cause precipitation of secondary phases.<\/p>\n\n\n\n

Applications<\/h3>\n\n\n\n

HAYNES\u00ae<\/sup> 556\u00ae<\/sup> alloy combines properties which make it highly useful for service at elevated-temperature in moderately to severely corrosive environments. Applications can include tubing and structural members in municipal and industrial waste incinerators, rotary calciners and kilns for minerals processing, and non-rotating components in industrial gas turbines burning low-grade fuels.<\/p>\n\n\n\n

In the chemical process industry, 556\u00ae<\/sup> alloy is used for applications in rotary calciners, carbon regenerators, and in processes involving high-sulfur petroleum feedstocks.<\/p>\n\n\n\n

In the metallurgical process industry, 556\u00ae<\/sup> alloy is widely used for hot-dip galvanizing fixtures, spinners and baskets, and for high speed furnace fans. 556\u00ae<\/sup> alloy is also employed in air preheaters of diesel engines, the inner covers of coil annealing furnaces, and in various high-temperature applications in the aerospace industry.<\/p>\n\n\n\n

*Please contact our technical support team<\/a> if you have technical questions about this alloy.<\/p>\n<\/div><\/div>\n\n\n\n

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Nominal Composition<\/h2>\n\n\n\n
\n
\n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\n Weight % <\/td>\n <\/tr>\n
\n Iron <\/td>\n \n 31 Balance <\/td>\n <\/tr>\n
\n Nickel <\/td>\n \n 20 <\/td>\n <\/tr>\n
\n Cobalt <\/td>\n \n 18 <\/td>\n <\/tr>\n
\n Chromium <\/td>\n \n 22 <\/td>\n <\/tr>\n
\n Molybdenum <\/td>\n \n 3 <\/td>\n <\/tr>\n
\n Tungsten <\/td>\n \n 2.5 <\/td>\n <\/tr>\n
\n Tantalum <\/td>\n \n 0.6 <\/td>\n <\/tr>\n
\n Nitrogen <\/td>\n \n 0.2 <\/td>\n <\/tr>\n
\n Silicon <\/td>\n \n 0.4 <\/td>\n <\/tr>\n
\n Niobium <\/td>\n \n 0.3 max. <\/td>\n <\/tr>\n
\n Manganese <\/td>\n \n 1 <\/td>\n <\/tr>\n
\n Aluminum <\/td>\n \n 0.2 <\/td>\n <\/tr>\n
\n Carbon <\/td>\n \n 0.1 <\/td>\n <\/tr>\n
\n Boron <\/td>\n \n 0.02 max. <\/td>\n <\/tr>\n
\n Lanthanum <\/td>\n \n 0.02 <\/td>\n <\/tr>\n
\n Zirconium <\/td>\n \n 0.02 <\/td>\n <\/tr>\n <\/table>\n<\/div>