Q: I am looking for a metal with high temperature oxidation resistance and strength to temperatures of up to 1200ºC, preferably in bar form.
You need to consider the wrought nickel base ageing alloys such as Inconel 718.
This alloy also contains molybdenum, titanium, aluminium and niobium to produce the metallurgical reactions necessary to impart strength at temperature.
The more highly alloyed alloys trade hot corrosion resistance for improved creep strength.
Will it be expensive?    All the nickel based alloys on the whole are expensive and difficult to work. Heat treatment requires considerable skill and expertise.

Q: What is a “Superalloy”?    
The term “Superalloy” is generally applied to those alloys that have useful levels of mechanical properties and oxidation resistance at high temperatures – generally in excess of 1000 ºC.  There are a number of families of superalloys, based on iron, nickel or cobalt as the principal metal.

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