With the considerable amount of turbine capacity now in operation and being built at the 1000 F and 1050 F levels, there is considerable incentive to develop a stronger ferritic steel for these temperatures. This paper presents a review of the high-temperature properties and manufacturing and heat-treating characteristics of a chromium-molybdenum-vanadium alloy. The authors’ company is utilizing this composition for turbine shells, valve casings, and steam leads at both 1000 F and 1050 F. This paper presents the characteristics of the piping form of this alloy. Corresponding properties and operating experiences are also presented on the chromium-free molybdenum-vanadium steel which preceded the chromium-molybdenum-vanadium composition.

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