Stainless Steel S44660 is the ferritic structure of Stainless steel provides a high strength/low work hardening material with good ductility.
These properties allow high design stress limits with good fabrication characteristics. Because of the nickel addition,UNS S44660 has a lower ductile-to-brittle transition temperature than similar ferritic steels without nickel additions.The ambient temperature strength of UNS S44660 stainless steel is retained over the temperature range encountered by most heat exchanger applications. UNS S44660 is approved for ASME Boiler and Pressure Vessel Code construction Section VIII, Division I. The allowable stresses for both sheet and tube are substantially higher than those of lower alloy ferritic and austenitic stainless steels. This factor can produce substantial savings through reduced section thickness or higher operating pressures. An upper temperature limit of 500˚F is imposed to avoid danger from 885˚F embrittlement which is a characteristic of all ferritic steels that contain more than 12% chromium.
