Temperature: 520 C
Slight Acidity ( Due to additives in plastic)
Material: Polypropylene and polyethylene
Pressure : 1 bar
The main material , used in the construction of industrial equipment, is stainless steel which is (of course) an alloy.
As you know, plastic pyrolysis involves thermochemical decomposition at elevated temperature in the absence of oxygen. Stainless steel can cope with such temperatures including the one you mentioned.
Many types of pyrolysis reactors are available but I favor the fluidized-bed reactor together with the cyclone that is connected to its outlet.
By the way, I studied reactor design "sizing, selection, materials of construction...etc." & liked the subject very much but I did not have the chance to teach it , as a course, in my long career at universities because the course is "reserved" for chemical engineers & not industrial chemists!
Here is a link that might help:
http://people.clarkson.edu/~wwilcox/Design/matselec.pdf
As others have pointed out a chrome-moly alloy is a good choice but the vessel probably could also be refractory lined carbon steal. However, there are special startup and shutdown procedures(temperature holds) to safely dry out the refractory at start up.
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