and a non-stick surface. Ferritic stainless steel is the substrate surface. Or What company can you recommend?
1380°F (750°C) is too much for all known commercial coatings which have a contact with chlorides. There are technical solutions for applications up to 550°C. These are the superheater tubes in waste incineration plants.
There are two kinds of coatings, which can be ordered:
1. cladding with Inconel 625 (cladding).
2. thermal spraying and remelting with self-fluxing alloys NiCrBSi.
As a manufacturer, I can, for example, the company Castolin ( https://www.castolin.com/en-US ) and Häuser ( http://www.haeuser-co.de/pages/en/home.php?lang=DE ) recommend.
High temperature chloride corrosion resistant materials were suggested at this forum, specifically considering the NaCl―KCl―LiCl molten salt system by around 500 ºC: https://www.researchgate.net/post/Can_someone_suggest_the_material_for_tank_of_NaCL_KCl_LiCl_mixture_about_500C
About sulphur corrosion of steels, you may check (e.g.):
Article Corrosion of Steel in Molten Sulfur.
http://www.sciencedirect.com/science/article/pii/S0010938X78800377https://www.ohio.edu/engineering/corrosion/research/upload/8172-20.pdf https://www.ohio.edu/engineering/corrosion/research/upload/8211-7.pdfhttp://www.csiheat.com/Uploads/files/Preventing%20Corrosion%20in%20Sulfur%20Storage%20Tanks.pdf
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