Some shortcomings of the commercial alloy MA 956 like insufficient hot gas corrosion resistance at extremely high temperatures or porous welding seams as a result of residual inert gas content, have been overcome by slightly changing the chemical composition, and a generally improved process technology. The mainly developed “work horse”-alloy PM 2000 - exhibits additionally significantly better stress-rupture properties at high temperatures. Workability even down to small dimensions is good, when an especially adapted processing route is applied.

In this paper data of tensile strength and stress rupture properties are given for elevated temperatures. Hot gas corrosion behaviour is demonstrated for isothermally and cyclicly treated materials, including thermal shock tests. Some results of a burner rig test are presented additionally. Resistance against different molten slags, salts and glasses has been investigated and is discussed.

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