Creep-Rupture Properties of Stainless Steels at 1600, 1800, and 2000 F

Abstract

In recent years, there has been a trend toward the use of increasingly higher operating temperatures in many industrial processes to obtain greater operating efficiencies. This trend has created many design- and material-selection problems. As is now widely recognized, the difference between the behavior of metals at elevated temperatures and at room temperature necessitates an approach to the problem of design for elevated-temperature service different from that for room-temperature service. The occurrence of creep during elevated-temperature service, as well as the need for preventing actual rupture (the end result of creep), requires knowledge of the stresses and temperatures which materials must withstand without producing excessive creep or rupture. However, the designer is often faced with very limited engineering information of this type. For example, little information is available on the creep and creep-rupture properties of stainless steels at temperatures above 1500 F. To provide a basis for the selection of stainless steels for service between 1600 and 2000 F, creep and creep-rupture tests and metallographic and X-ray diffraction studies were conducted on sheet product of AISI Types 302, 309S, 310S, 314, and 316, and Type 310 Cb stainless steels at 1600, 1800, and 2000 F, and on sheet product of AISI Type 446 stainless steel at 1600 and 1800 F.

Microstructure and stability conditions for hot deformation of a modified iron-based superalloy

“…Incoloy alloy 800 is an iron-based superalloy that belongs to the type of super austenitic stainless steels. The alloy is derived from the austenitic steel AISI 304 and is used in applications that require strength at high temperatures and corrosion resistance in a variety of corrosive environments [1,2]. It is particularly useful for high-temperature equipment in the petrochemical industry because the alloy is not susceptible to sigmaphase embrittlement after long time exposure at 650°C.…”