Stainless Steel 446 is a high chromium Ferritic heat resistant alloy which includes magnificent resistance to oxidation, sulfidation and other forms of hot corrosion. This grade is most regularly utilized between 1500 - 2100°F, despite the fact that its high temperature strength is entirely low. 446 is the only heat resistant alloy that will endure molten copper as well as brass. Similarly with other high chromium Ferritic stainless, 446 embrittles severely in the 700-1000°F temperature range (885°F embrittlement).
Stainless Steel 446 ought not to be utilized as a part of this temperature range unless almost finish loss of room temperature ductility might be endured. Sigma phase embrittlement occurs upon long time exposure within the scope of 1000-1300°F. 446 have a high ductile-to-brittle effect transition temperature. Therefore, successful forming and bending is aided by edge preparation, low forming speeds and preheating to 250-400°F. Annealing, when compulsory should be performed at 1550-1650°F followed by fast cool. Welding may be performed by standard techniques. Preheating and post heating to 300-600°F is useful. Austenitic weld fillers, for example AWS E310 or E312 are usually recommended for maximized weld deposit ductility.
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