Material selection for pressure vessels used in the conversion of yellow phosphorus to red phosphorus

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According to the patent: the conversion of yellow phosphorus into red phosphorus must take place at around 300°C under certain pressure; the heating and pressurization processes are carried out gradually, with the maximum temperature reaching 325°C. Finally, the total nitrogen pressure inside the container is 10 atmospheres. Question: (1) Why is nitrogen continuously introduced into the container during the conversion process? Must the conversion process take place under high pressure? (2) What material is the conversion container you use made of? Can 316L stainless steel be used? Is another material still needed? The container material must not react with phosphine vapor, otherwise it will contaminate the product. I earnestly ask everyone to extend a helping hand; I would be extremely grateful! ! Melting point of yellow phosphorus: 44.11℃ ； Boiling point: 180.51°C.