Stainless Steel 446 is a very high chromium ferritic temperature resistant alloy with outstanding resistance to metabolism, sulfidation along with other types of hot corrosion. This grade is most frequently utilized between 1500 – 2100°F, even though it is elevated temperatures energy is really low. 446 is the only temperature resistant alloy that can tolerate molten copper or brass. Similar to other high chromium ferritic stainless steel, 446 embrittles severely in the 700-1000°F temperatures range (885°F embrittlement). 446 ought not to be utilized in this heat range except close to complete loss of room temperatures ductility might be tolerated. Sigma phase embrittlement takes place upon very long time exposure in the 1000-1300°F range.
446 possess excellent ductile-to-brittle impact transition temperatures. Thus, effective forming and also bending is assisted by lower forming speeds, edge preparation or preheating to 250-400°F. Annealing, while necessary have to be performed at 1550-1650°F followed by quick cool.
Welding can be accomplished by standard methods. Pre-heating and postheating to 300-600°F is beneficial. Austenitic weld fillers, for example AWS E310 or E312 are usually recommended to maximize weld deposit ductility.